American Audio Stereo Amplifier VLP Series User Manual

Professional Power Amplifier  
VLP Series  
User Instructions  
AMERICAN AUDIO®  
4295 Charter Street  
Los Angeles Ca. 90058  
Rev. 2/06  
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CAUTION  
Do not open -  
risk of electric shock  
POUR ASSURER L A FIABILETE ET  
OBTENIT UNE PERFORMANCE OPTIMALE,  
NESOUMETTE JAMAIS LAMPLIFICATEUR  
A UNE CHARGE D’IMPEDANCE TOTALE  
INFERIEURE A 2 OHMS, NI AVEC UN H.P. NI  
EN COMBINAISON DES H.P.  
FOR OPTIMUM PERFORMANCE AND  
RELIABILITY DO NOT PRESENT THE  
AMPLIFIER WITH A SPEAKER LOAD  
OF LESS THAN 2 OHMS OR ANY  
COMBINATION OF SPEAKERS THAT  
TOGETHER ARE LESS THAN 2 OHMS!  
CAUTION: TO REDUCE THE RISK OF ELECTRIC  
SHOCK, DO NOT REMOVE THE COVER.  
THERE ARE NO USER SERVICEABLE PARTS  
INSIDE. REFER ALL SERVICE TO YOUR  
AUTHORIZED AMERICAN AUDIO® DEALER.  
The lightning flash with an arrow triangular  
symbol is intended to alert the user to the  
presence of non insulated “dangerous volt-  
age” within the products enclosure, and  
may be of sufficient magnitude to consti-  
tute a risk of electric shock.  
AVEC UN H.P., IL FAUT UNE CHARGE  
D’IMPEDANCE MINIMUM DE 2 OHMS.  
USING ONE SPEAKER, IT MUST BE  
RATED AT 4 OR MORE OHMS.  
USING TWO SPEAKERS, THEY MUST  
RATED EACH AT 4 OR MORE OHMS.  
AVEC DEUX H.P., FAUT POUR CHAOUN UNE  
CHARGE D’IMPEDANCE MINIMUM DE 4  
OHMS.  
The exclamation point triangular symbol is  
intended to alert the user to the presence  
of important operating and maintenance  
(servicing) instructions in the user manual  
accompanying the amplifier.  
USING THREE SPEAKERS, THEY  
MUST BE RATED EACH AT 8 OR MORE  
OHMS.  
AVEC TROIS H.P., FAUT POUR CHAOUN UNE  
CHURGE D’IMPEDANCE MINIMUM DE 8  
OHMS.  
CONTENTS:  
Safety Precautions.......................................................................................................................................................................................4  
Introduction...............................................................................................................................................................................................4  
Front Panels.................................................................................................................................................................................................5  
Rear Panels..................................................................................................................................................................................................7  
Inputs...........................................................................................................................................................................................................9  
Outputs............................................................................................................................................................................................................9  
Speakon Output Connector Assembly.......................................................................................................................................................11  
Operating Modes........................................................................................................................................................................................12  
Protection Circuitry  
Limiter.................................................................................................................................................................................................13  
Short Circuit Protection...................................................................................................................................................................13  
Thermal Protection..........................................................................................................................................................................14  
Amplifier Features.......................................................................................................................................................................................14  
Speaker Setup............................................................................................................................................................................................15  
Warranty.................................................................................................................................................................................................16  
Specifications...............................................................................................................................................................................................17  
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Important Precautions  
Introduction  
To reduce the risk of electrical shock or fire, do not expose this Introduction: Congratulations and thank you for purchasing  
unit rain or moisture.  
this American Audio® VLP seriesamplifier. This amplifier is a  
representation of American Audio’s continuing commitment to  
produce the best and highest quality products all at an affordable  
price. Please read and understand this manual completely before  
attempting to operate your new amplifier. This booklet contains  
• Do not spill water or other liquids into or on to your unit.  
• Do not attempt to operate this unit if the power cord has been  
frayed or broken.  
• Do not attempt to remove or break off the ground prong from  
the electrical cord. This prong is used to reduce the risk of elec- important information concerning the proper and safe operation of  
trical shock and fire in case of an internal short.  
• Disconnect main power before making any type of connection  
• Do not remove the cover under any conditions. There are no  
user serviceable parts inside.  
your new amplifier.  
Unpacking: Every VLP Seriesamplifier has been thoroughly  
tested and has been shipped in perfect operating condition.  
Carefully check the shipping carton for damage that may have  
occurred during shipping. If the carton appears to be damaged,  
carefully inspect your unit for any damage and be sure all acces-  
sories necessary to operate the unit has arrived intact. In the event  
damage has been found or parts are missing, please contact our  
toll free customer support number for further instructions. Please  
do not return the amplifier to your dealer without contacting cus-  
tomer support first.  
• Never plug this unit in to a dimmer pack.  
• Always be sure to mount this unit in an area that will allow  
proper ventilation. Allow about 6” (15cm) between this device  
and a wall.  
• Do not attempt to operate this unit, if it becomes damaged.  
• This unit is intended for indoor use only, use of this product out-  
doors voids all warranties.  
• During long periods of non-use, disconnect the unit’s main  
power.  
Installation: This amplifier is designed to mount into a standard  
19” rack. The front panel provides four holes used to screw the  
unit into a rack. The unit also provides a way to rear mount the  
unit into a rack for added security. Rear mounting the unit is espe-  
cially recommended for this amplifier if the unit is to mounted into  
a mobile rack.  
• Always mount this unit in a safe and stable manner.  
• Power cords should be routed so they are not likely to be  
walked on, pinched by items placed upon or against them.  
• Cleaning -The outside of the unit should be wipe down with a  
soft cloth and mild cleaner when needed.  
Customer Support: American Audio® provides a toll free custom-  
er support line, to provide set up help and to answer any question  
should you encounter problems during your set up or initial opera-  
for any comments or suggestions. For service related issue please  
contact American Audio®. Service Hours are Monday through  
Friday 9:00 a.m. to 5:00 p.m. Pacific Standard Time.  
• Heat -The appliance should be situated away from heat sources  
such as radiators, heat registers, stoves, or other appliances  
(including amplifiers) that produce heat.  
• The fixture should be serviced by qualified service personnel  
when:  
A. The power-supply cord or the plug has been damaged.  
B. Objects have fallen on, or liquid has been spilled into the unit.  
C. The appliance has been exposed to rain or water.  
D. The fixture does not appear to operate normally or exhibits a  
marked change in performance.  
Voice: (800) 322-6337  
Fax: (323) 582-2610  
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Front Panel  
1
2 3 4 5  
6
5 7 8 9  
10  
VLP600 & VLP1500  
PROFESSIONAL POWER AMPLIFIER  
6
6
10  
10  
3
3
15  
0  
15 POWER  
15  
10  
15  
PRO CLP  
POWER  
CLIP PRO  
1
1
30  
30  
80  
80  
0 dB  
0 dB  
CH A  
CH B  
VLP1500  
Figure 1  
control to reduce the risk of damage to your speakers and amplifier. This  
LED may glow when the unit has been turned off, this is normal.  
1. Channel 1 Gain Control - This rotary knob is used to control the out-  
put signal of channel one. Turning the knob in a clockwise direction will  
increase signal output.  
9. Channel 2 Protect Indicator - The red Protect LED will begin to glow  
when the channel goes into protect mode. When the channel goes into  
protect mode all output for that channel will turn off. This is to protect any  
speakers connected to the channel.  
2. Channel 1 Protect Indicator - The red Protect LED will begin to glow  
when the channel goes into protect mode. When the channel goes into  
protect mode all output for that channel will turn off. This is to protect any  
speakers connected to the channel.  
10. Channel 2 Gain Control - This rotary knob is used to control the  
output signal of channel two. Turning the knob in a clockwise direction  
will increase signal output.  
3. Channel 1 Clip Indicator - This red LED will begin to flash when  
channel one begins to overload (clip). At this point channel one will be-  
gin to distort. Under heavy clipping activity lower the channel one gain  
control to reduce the risk of damage to your speakers and amplifier. This  
LED may glow when the unit has been turned off, this is normal.  
4. Channel 1 Signal Indicators - These green and yellow LED’s will glow  
according to the average signal output.  
5. Function Indicators - These indicators detail the operating mode of  
the amplifier. These LEDs will also function as a power indicator.  
6. Power Switch - This switch is used to control the units main power.  
7. Channel 2 Signal Indicators - These green and yellow LED’s will glow  
according to the average signal output.  
8. Channel 2 Clip Indicator - This red LED will begin to flash when  
channel one begins to overload (clip). At this point channel one will be-  
gin to distort. Under heavy clipping activity lower the channel one gain  
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11  
12 13 14 15  
16  
15 17 18 19  
20  
Front Panel  
VLP300  
6
6
PROFESSIONAL POWER AMPLIFIER  
10  
10  
3
3
15  
15  
PRO CLIP  
0  
15 POWER  
POWER 15  
10 CLIP  
PRO  
1
1
30  
30  
CH A  
CH B  
80  
80  
0 dB  
0 dB  
VLP300  
Figure 2  
LED may glow when the unit has been turned off, this is normal.  
11. Channel 1 Gain Control - This rotary knob is used to control the  
output signal of channel one. Turning the knob in a clockwise direction  
will increase signal output.  
19. Channel 2 Protect Indicator - The red Protect LED will begin to  
glow when the channel goes into protect mode. When the channel goes  
into protect mode all output for that channel will turn off. This is to pro-  
tect any speakers connected to the channel.  
12. Channel 1 Protect Indicator - The red Protect LED will begin to  
glow when the channel goes into protect mode. When the channel goes  
into protect mode all output for that channel will turn off. This is to pro-  
tect any speakers connected to the channel.  
20. Channel 2 Gain Control - This rotary knob is used to control the  
output signal of channel two. Turning the knob in a clockwise direction  
will increase signal output.  
13. Channel 1 Clip Indicator - This red LED will begin to flash when  
channel one begins to overload (clip). At this point channel one will be-  
gin to distort. Under heavy clipping activity lower the channel one gain  
control to reduce the risk of damage to your speakers and amplifier. This  
LED may glow when the unit has been turned off, this is normal.  
14. Channel 1 Signal Indicators - These green and yellow LED’s will  
glow according to the average signal output.  
15. Power Indicators - These LEDs function as a power indicator.  
16. Power Switch - This switch is used to control the units main power.  
17. Channel 2 Signal Indicators - These green and yellow LED’s will  
glow according to the average signal output.  
18. Channel 2 Clip Indicator - This red LED will begin to flash when  
channel one begins to overload (clip). At this point channel one will be-  
gin to distort. Under heavy clipping activity lower the channel one gain  
control to reduce the risk of damage to your speakers and amplifier. This  
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21  
22 23 24  
25  
26  
27  
28  
21  
Rear Panel Control  
VLP600 & VLP1500  
36  
Figure 3  
35 34 33  
32  
31  
30  
29  
21. Cooling Fans - Dual high speed cooling fans  
30. Channel 1 Output Jack/5 way Binding Post - Connect to your speaker’s  
input jack. Red is positive signal and Black is negative signal.  
22. Channel 2 XLR Input - Channel two 3-pin XLR balanced input jack. See  
page 9 for more details.  
31. Channel 1 Speakon Output - Optional speaker output connections. Use  
pins 1+ and 1- of this 4-pole Speakon connector to connect to your speaker’s  
Speakon input jack.  
23. Channel 2 TRS Input - Channel two 1/4” female jack. Excepts either a bal-  
anced or unbalanced plug. See page 9 for more details.  
24. Mode Switch - This switch controls the amplifier’s operating mode. The  
amplifier can operate in three different modes; Mono Bridge, Stereo, or Parallel  
Mono. The amplifier is shipped in stereo mode.  
32. Filter Switch - This switch controls the amplifier’s filter mode. The amplifier  
can operate in three different filter modes; High Pass, Low Pass, and By-Pass.  
33. Sensitivity Switch - This switch lets you choose the input sensitivity.  
25. Ground On/Off Switch - If hear a hum or any interference, put the Ground  
switch in the “On” postion .  
34. Channel 1 TRS Input - Channel one 1/4” female jack. Excepts either a bal-  
anced or unbalanced plug. See page 9 for more details.  
26. Channel 2 Speakon Output - Optional speaker output connections. Use  
pins 1+ and 1- of this 4-pole Speakon connector to connect to your speaker’s  
Speakon input jack.  
35. Channel 1 XLR input - Channel one 3-pin XLR balanced input jack. See  
page 9 for more details.  
36. Limiter Switch - This switch is used to limit the input level. Use this function  
to avoid damage to your speakers.  
27. Channel 2 Output Jack/5 way Binding Post - Connect to your speaker’s  
input jack. Red is positive signal and Black is negative signal.  
28. AC Cord - Plug this cable into a standard wall outlet. Check that the voltage  
in your area matches the amplifiers required voltage.  
29. Fuse Holder - This housing stores a 15 amp GMA protective fuse for the  
VLP 600 and 30 amp GMA protective fuse for the VLP 1500. Never defeat the  
fuse, the fuse is designed to protect the electronics in the event of severe power  
fluctuations. Always be sure to replace the fuse with an exact match as the one  
being replaced, unless otherwise told to do so by an authorized American Au-  
dio® service technician.  
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Rear Panel Control  
37  
38  
39 40 41 42 43 44 45  
46 47  
48  
49  
50  
Figure 4  
51  
37. AC Cord - Plug this cable into a standard wall outlet. Check that the voltage  
in your area matches the amplifiers required voltage.  
48. Channel 1 Speakon Output - Optional speaker output connections. Use  
pins 1+ and 1- of this 4-pole Speakon connector to connect to your speaker’s  
Speakon input jack.  
38. Channel 1 TRS Input - Channel one 1/4” female jack. Excepts either a bal-  
anced or unbalanced plug. See page 9 for more details.  
49. Channel 2 Speakon Output - Optional speaker output connections. Use  
pins 1+ and 1- of this 4-pole Speakon connector to connect to your speaker’s  
Speakon input jack.  
39. Channel 1 XLR input - Channel one 3-pin XLR balanced input jack. See  
page 9 for more details.  
40. Mode Switch - This switch controls the amplifier’s operating mode. The  
amplifier can operate in three different modes; Mono Bridge, Parallel Mono, or  
Stereo. The amplifier is shipped in stereo mode.  
50. Cooling Fans - Dual high speed cooling fans  
50. Fuse Holder - This housing stores a 8 amp GMA protective fuse. Never  
defeat the fuse, the fuse is designed to protect the electronics in the event of  
severe power fluctuations. Always be sure to replace the fuse with an exact  
match as the one being replaced, unless otherwise told to do so by an autho-  
rized American Audio® service technician.  
41. Channel 2 XLR Input - Channel two 3-pin XLR balanced input jack. See  
page 9 for more details.  
42. Channel 2 TRS Input - Channel two 1/4” female jack. Excepts either a bal-  
anced or unbalanced plug. See page 9 for more details.  
43. Filter Switch - This switch controls the amplifier’s filter mode. The amplifier  
can operate in three different filter modes; High Pass, Low Pass, and By-Pass.  
44. Sensitivity Switch - This switch lets you choose the input sensitivity.  
45. Ground On/Off Switch - If hear a hum or any interference, put the Ground  
switch in the “On” postion .  
46. Channel 2 Output Jack/5 way Binding Post - Connect to your speaker’s  
input jack. Red is positive signal and Black is negative signal.  
47. Channel 1 Output Jack/5 way Binding Post - Connect to your speaker’s  
input jack. Red is positive signal and Black is negative signal.  
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Set Up  
INPUTS - The VLP Series amplifier allows you to use two types of input connector per a channel, a XLR jack for balanced connections  
and a 1/4” female jack that will accept balanced and unbalanced connectors. Use these connections to connect the output signal from  
a mixer, cross-over or EQ to your VLP Series amplifier. A balanced connection is recommended for cable runs longer that 20ft. When  
constructing your own XLR cables follow the pin configuration describe below for proper connections. For cable runs shorter than  
20ft. you may choose the 1/4” unbalanced input option. The 1/4” unbalanced input option may be more convenient for most users  
due to the abundant supply of prefabricated cables available at your local audio dealer. You may use the two XLR “Input Thru” jacks  
to jump a parallel connection to another amplifier or other device. For Example: Connect a XLR cable to the input of channel one. You  
may now connect a XLR cable from the channel one “Input Thru” jack to the input jack of another amplifier’s channel one input. This  
will reduce the use of “Y” cables.  
Male XLR Pin Configuration:  
Balanced TRS 1/4” Plug  
Unbalanced TS 1/4” Plug  
US ITT Standard  
2
1
Figure 5  
Figure 6  
3
Figure 7  
Hot (+)  
Negative (-)  
Ground/Shield  
Hot (+)  
2 Hot (+ data)  
3 Negative (- data)  
1 Ground/Return/ 0v)  
Negative (-)  
OUTPUTS:  
Binding Post/Banana Plug - Connect your speakers to the binding post outputs on the rear of the amplifier. The  
speaker wire may be connect by bare wire (directly connected, usually for permanent connections), banana plug,  
or spade connector. Connections are made to Channels 1 and 2 output’s for stereo mode or across the red ter-  
minals of Channels 1 and 2 for Mono Bridge Mode.  
Important Notice: Although a speaker will operate with the positive and negative leads plugged into either ter-  
minal on the amplifier binding post, be sure to plug the negative lead into the black terminal and positive lead  
into the red terminal. Ensuring proper polarity will avoid speakers being out of phase, that can cause a loss of  
bass response.  
Figure 8  
Important Notice: Banana Plugs - When connecting your speakers to the amplifier using banana jacks; Be sure that the red and black  
caps on the binding post are completely screwed in. Insert the banana jacks into the caps of the binding post, be sure that the banana  
jack is inserted securely to avoid the risk of it popping out.  
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Bare Wire Connections: (Figure 9)  
Figure 9  
When connecting your speakers to the amplifier using bare wire; Unscrew the red and  
black caps on the binding post, be sure not to completely remove or unscrew the red  
and black caps. Strip back the wire insulation 1/2” (13mm). Insert the bare wire into the  
hole that was reveled by unscrewing the binding post cap. After inserting the wire into  
the binding post hole, screw the binding post cap down on the wire. To reduce the risk of  
shock or damage to your amplifier, be sure that the wire connected to one binding post  
does not come in contact with that of another.  
Typical speaker output using bare wire. Insert  
bare wire into the binding post and tighten.  
Spade Connector: (Figure 10)  
When connecting your speakers to the amplifier using spade connector; Unscrew the red and black caps on  
the binding post, be sure not to completely remove or unscrew the red and black caps. Insert the spade con-  
nector in to the binding post and tighten the caps down on the spade connector. To reduce the risk of shock  
or damage to your amplifier, be sure that the wire connected to one binding post does not come in contact  
with that of another.  
When connecting your speakers to the amplifier using banana jacks; Be sure that the red and black caps on  
the binding post are tighten down completely. Insert the banana jacks into the caps of the binding post, be  
sure that the banana jack is inserted securely to avoid the risk of it popping out.  
Mono Bridge Connections:  
Figure 10  
Mono bridge operation connections will follow the above descriptions however, when operating in mono  
bridge operation the speaker connections will run between the two positive (red) leads. Use channel two pos-  
itive output terminal for the negative connection and the channel one positive output terminal for the positive  
connection.  
Typical speaker output using  
spade connectors. Insert  
bare wire into the binding  
post and tighten.  
Stereo Connections Using the Neutrik Speakon output connectors:  
Recent regulatory requirements in Europe have outlawed the use of the dual banana plug and force amp users to terminate their speaker  
cables with spade lugs or bare wire ends. This is not advantageous to most users that want to reconfigure their systems or quickly  
change out an amp. The Neutrik Speakon® connector provides the most convenient solution to this problem, eliminating the need for  
spade plugs or bare wire end cables. Major speaker manufacturers have been using Speakon connectors on their products for years,  
so chances are you are ready to use the Speakon connection. With Speakon connectors, you can connect straight from the amplifier  
to the speaker. The Speakon connector used on this amplifier meets all known safety regulations. Once wired correctly, the connector  
cannot be plugged in backwards, causing the type of inverted polarity situations that have become common with banana hookups. This  
connection will provide a safe, secure and reliable method of connecting your speakers to your new amplifier. You can purchase the  
Speakon® NL4FC connectors from your local audio dealer.  
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SPEAKON ASSEMBLY: You will need a pair of Neutrik Speakon® NL4FC  
connectors. You will also need high-quality two or four conductor speaker  
cable, a pair of needle-nosed pliers and a 1.5-mm Allen key to assemble the  
Speakon connectors to your speaker wire. To assemble the Neutrik Speakon  
NL4FC connector, complete the following steps:  
Figure 11  
Brass Inserts  
4-Conductor Speaker Cable  
1. Strip back 3/4-inch of the cable casing. Strip off 1/4-inch from the end of  
each of the conductors down to bare wire, and insert the brass fittings. See  
Figure 11.  
Figure 12  
2. Slide the cable tension clip (D) and the speakon coupler (E) through the  
cable end. See Figure 12.  
3. Insert each wire with the brass fittings into the top of appropriate slot of the  
connector insert (B) as shown in Figures 12 and 13. Use a 1.5-mm Allen key  
to tighten the connection. See Figure 13.  
4. Be sure to properly match the positive (+) and negative (–) leads of each  
wire. See Figure 14.  
A
B
C
D
E
5. Slide the connector insert (B) into the connector housing (A), making sure  
that the large notch on the outer edge of the insert lines up with the large  
groove on the inside of the connector housing. The insert should slide easily  
through the housing and out the other side until it extends approximately 3  
/4-inch from the end of the housing.  
Figure 13  
6. Slide the cable tension clip (D) along the cable and insert into the housing  
(A), making sure that the large notch lines up with the large groove on the  
inside of the connector housing (A). The cable tension clip (D) should slide  
easily into the housing until only 3 /8-inch of the cable tension clip (D) extends  
from the back end of the connector.  
7. Slide the coupler (E) along the cable and screw it onto the end of the  
housing (A). Before tightening, you may want to test the connector to make  
sure it has been assembled properly.  
Figure 14  
INPUT BAANCE  
SPEAKON 1+ HOT  
II
I
1
COLD  
UTPUTS  
C
2
C
1
-
+
+2  
+1  
-1  
+2  
+1  
+2  
-1  
+2  
+
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OPERATING MODES: Always configure your amplifier operating mode before beginning operation. If you want to change it dur-  
ing performance. You must decrease the gain controls to their lowest levels to protect the speakers from any popping noise.  
Stereo Operation - Page 15/Figure 15 details an example of a typical stereo set-up. Connect your inputs into channels one and  
two of the amplifier. Connect your speakers to the outputs on the rear of the amplifier. Be sure that your front gain controls are turned  
down to their lowest level (full counter-clockwise). Turn your amp on. Turn your input source level up. Use your front gain controls to  
regulate the output volume. Be sure not to raise the volume to the clip level, however an intermittent clip signal is acceptable.  
Mono Bridge Operation - Page 15/Figure 16 details a mono bridge set-up. Be sure your amplifier and all other audio equipment  
is powered down. Flip the Stereo/Mono Bridge switch to the Mono Bridge position. Connect an input signal to channel one. Connect  
your speaker across the red output binding post on the rear of your amplifier. Turn your equipment on (your amplifier should always  
be the last item you turn on). Apply an input source signal to your amplifier. Turn channel two gain up. Use the channel one gain to  
regulate your amplifier output.  
Bridged-Mono Mode Caution - The voltage across the output terminals of a bridged VLP Seriesamplifier may equal or exceed  
100 volts RMS and may be as high as 130 volts. Use fully insulated CLASS ONE wiring, and the load must be rated for up to 2500 watts  
(@4 ohms)  
Parallel Mono - “Parallel ” ties the two channel line inputs together so that they will both be driven by the same signal, without the  
need for external jumpers or wiring. Both amplifier channels will operate independently. Though they carry the same signal, their gain  
controls affect only their respective channels, and they both must use their respected speaker outputs. Never attempt to parallel the  
speaker outputs, this may cause serious damage to your amplifier! This mode is recommended when using the VLP Series™ to run bass  
speakers, to achieve better low end. To run in parallel mono mode connect your system as you would if you were going to run in stereo  
mode. Then flip the mode switch to “MONO.” Be sure the amp is off or the power is disconnected before making any changes.  
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Mono Subwoofer - This operation is similar to the Stereo Subwoofer operation but in mono. When running subwoofers it is usually  
recommended to run them in mono mode to achieve a cleaner tighter low end. This operation allows you to run several subwoofers  
down to a minimum of 4 ohms. To avoid amplifier overheating, never run the amplifier below 8 ohms in this mode. Set up this mode  
as you would a standard stereo set up. Be sure both channels are set to “SUBWOOF” and the mode switch is set to “MONO.” In this  
mode you may use the frequency adjustment on the rear of the amp, to control the bass frequency output level. Frequencies may be  
adjusted from 20Hz to 200Hz.  
One Channel Normal/One Channel Subwoofer (BI-AMP) - You may also use your amp to bi-amp your system. You may use one  
side of the amp to power a subwoofer and the other side to power a full range speaker. Follow the set up guides listed above to mix  
and match your operations.  
PROTECTION:  
Limiter - Only the VLP 1500 and 600 come with a built in limiter. When the input signal overloads, the “CLIP LED’s” indicate a sig-  
nal overload, at this time, the master volume should be lowered to reduce distortion. If the input gain level is not reduced the built-in  
limiter will activate. During signal overload, the limiter will reduce the input audio signal enough to minimize the amount of clipping.  
A limiter takes the gain of an overloading signal and reduces it, the reduction in gain reduces distortion that can cause damage to  
your speakers and amplifier. During normal operation below clipping, and momentary clips on peaks, the limiter does not affect the  
audio signal and is inaudible. It will allow brief clipping of peaks and will only activate when continuous, hard clipping occurs. During  
excessive clipping the limiter will reduce the audio signal enough to minimize the amount of clipping. When the input signal decreases  
enough that clipping ends, the limiter will deactivate and cease its gain reduction. The limiter has a fixed threshold and can not be  
adjusted.  
Safe Power Levels at Different Output Loads:  
8-Ohm Loads: The amplifier can operate at practically any power level without risk of overheating. However, if it is pushed hard  
enough to continually light the “CLIP ” indicator, the amplifier’s average output power can reach 150 watts.  
4-Ohm Loads: If the “CLIP” indicator flashes occasionally, the amplifier is approaching its maximum long-term power capacity. If it is  
lit about half the time, the amplifier channel will probably go into thermal protection within a few minutes.  
Short Circuit Protection - The VLP Seriesamplifiers all come with built-in Output Short Circuit Protects. The Output Short Circuit  
Protection protects the output devices of the amplifier from short circuits and stressful loads. If your speaker lines short, the amplifier  
automatically detects this problem and discontinues operation for that channel. If one side of your  
amplifier becomes shorted and goes into protect mode, the other side will continue to operate nor-  
mally. During short circuit protection, the "Clip" LED and “Protect" LED will light simultaneously indi-  
cating amplifier fault. All channel output during the “Short Circuit Protection" will be interrupted (i.e.  
no sound out  
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put). Short Circuit Protection can usually be traced back to the signal output line (i.e. speaker line). Check the line from the output ter-  
minal of the amplifier to the speaker. If this line good, check the internal speaker connections and components. A short circuit will usu-  
ally be traced to a bad cable or a bad speaker component and is rarely traced to the amplifier itself.  
Thermal Protection - Dual variable speed fans on the VLP Series amplifier provide adequate cooling. During low level output the fans  
run at normal speeds. During high output and as heat raises, (exceeding 90°C.), the fans will run at higher speeds to aid the cooling  
process. If the heatsink temperature exceeds 91°C., the amplifier will mute until the amplifier cools down. When the amplifier cools  
below 90°C., the amplifier will return to normal operations. Be sure not to operate your amplifier below the minimum load ratings to  
reduce the risk of overheating problems.  
Input/Output Protection - The input circuits are isolated by 10k resistors. An ultrasonic network uncouples RF from the output and  
helps keep the amplifier stable with reactive loads.  
Operating Voltage (AC Mains) - The serial number label indicates the correct AC main voltage. Connecting to the wrong voltage is  
dangerous and may damage the amplifier. Always be sure the source voltage for your areas matches the required voltage for your  
amplifier.  
Gain Controls - The gain controls are located on the front panel and are calibrated in 2dB of attenuation from full gain. It is best to  
adjust the amplifier so no “hissing” is heard from speakers with no music being played, this will ensure the lowest possible distortion  
during normal operation.  
AMPLIFIER FEATURES:  
THRU - Thru will allow the user to daisy-chain one amplifiers signal input into another amplifier. Plug the signal source outputs into the  
first amplifier’s input, patch from the amplifier’s THRU jacks to the next amplifier’s input, and so on, daisy-chaining as many amplifiers  
as there is no excessive level loss. Is not affected by crossover setting.  
GROUND LIFT SWITCH - Applying or lifting the ground switch will change the level for background noise and hum, if the noise level  
remains the same in either position, it is better to keep the ground lift switch in the ground position. This will eliminate 60Hz cycle hum  
that is sometimes induced when mounting several units in the same rack.  
OPERATING VOLTAGE (AC MAINS) - The serial number label indicates the correct AC main voltage. Connecting to the wrong voltage  
is dangerous and may damage the amplifier.  
GAIN CONTROLS - The gain controls are located on the front panel and are calibrated in 2dB of attenuation from full gain. It is best to  
adjust the amplifier so no “hissing” is heard from speakers with no music being played, this will ensure the lowest possible distortion  
during normal operation.  
LED INDICATORS - Each channel has five LEDS. Two LEDs indicate signal level activity; two green LEDs. One yellow LED indicates  
signal clipping. One red LED indicates protections mode for shorts/ overload. One blue LED indicates power for each individual chan-  
nel.  
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TYPICAL STEREO OUTPUT CONNECTIONS  
Figure 15  
Use Speakon or Banana Jacks  
SPEAKERS  
4 OHM MINIMUM  
SPEAKERS  
4 OHM MINIMUM  
TYPICAL MONO BRIDGE SET-UP  
Use Channel 1 Inputs Only (XLR or 1/4” Jacks)  
Figure 16  
X
Use the two positive binding post  
termainals (red) for speaker output.  
SPEAKERS  
8 OHM MINIMUM  
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The VLP series carries a one year limited warranty. We recommend you fill out the enclosed warranty card to validate your purchase. All  
returned service items whether under warranty or not, must be freight pre-paid and accompany a R.A. (return authorization) number. If the  
mixer is under warranty, you must provide a proof of purchase invoice. You may obtain a R.A. number by contacting our customer support  
team on our toll free number. Please contact American Audio® customer support at (800) 322-6337 for a R.A. number. All package  
not displaying a R.A. number on the outside of the package will be returned to the shipper.  
1-YEAR LIMITED WARRANTY  
A. American Audio® hereby warrants, to the original purchaser, American Audio® products to be free of manufacturing defects in material and work-  
manship for a period of 1 Year (365 days) from the date of purchase. This warranty shall be valid only if the product is purchased within the United  
States of America, including possessions and territories. It is the owner’s responsibility to establish the date and place of purchase by acceptable  
evidence, at the time service is sought.  
B. For warranty service, send the product only to the American Audio® factory. All shipping charges must be pre-paid. If the requested repairs or  
service (including parts replacement) are within the terms of this warranty, American Audio® will pay return shipping charges only to a designated  
point within the United States. If the entire instrument is sent, it must be shipped in its original package. No accessories should be shipped with  
the product. If any accessories are shipped with the product, American Audio® shall have no liability whatsoever for loss of or damage to any such  
accessories, nor for the safe return thereof.  
C. This warranty is void if the serial number has been altered or removed; if the product is modified in any manner which American Audio® con-  
cludes, after inspection, affects the reliability of the product; if the product has been repaired or serviced by anyone other than the American Audio®  
factory unless prior written authorization was issued to purchaser by American Audio®; if the product is damaged because not properly maintained  
as set forth in the instruction manual.  
D. This is not a service contract, and this warranty does not include maintenance, cleaning or periodic check-up. During the period specified above,  
American Audio® will replace defective parts at its expense, and will absorb all expenses for warranty service and repair labor by reason of defects  
in material or workmanship. The sole responsibility of American Audio® under this warranty shall be limited to the repair of the product, or replace-  
ment thereof, including parts, at the sole discretion of American Audio®. All products covered by this warranty were manufactured after January 1,  
1990, and bear identifying marks to that effect.  
E. American Audio® reserves the right to make changes in design and/or improvements upon its products without any obligation to include these  
changes in any products theretofore manufactured.  
F. No warranty, whether expressed or implied, is given or made with respect to any accessory supplied with products described above. Except to  
the extent prohibited by applicable law, all implied warranties made by American Audio® in connection with this product, including warranties of  
merchantability or fitness, are limited in duration to the warranty period set forth above. And no warranties, whether expressed or implied, including  
warranties of merchantability or fitness, shall apply to this product after said period has expired. The consumer’s and or Dealer’s sole remedy shall  
be such repair or replacement as is expressly provided above; and under no circumstances shall American Audio® be liable for any loss or damage,  
direct or consequential, arising out of the use of, or inability to use, this product.  
G. This warranty is the only written warranty applicable to American Audio® products and supersedes all prior warranties and written descriptions  
of warranty terms and conditions heretofore published.  
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VLP SERIES SPECS  
Power supply:  
AC 100V, 50/60Hz (Japan)  
AC 110V, 60Hz (Colombia)  
AC 120V, 60Hz (U.S.A. and Canada)  
AC 127V, 60Hz (Mexico)  
AC 220V, 50Hz (Chile and Argentina)  
AC 220V, 60Hz (Philippines and Korea)  
AC 230V, 50Hz (Europe, New Zealand, South Africa, and Singapore)  
AC 240V, 50Hz (Australia and U.K.)  
MODEL:  
VLP 300  
VLP 600  
VLP 1500  
Output Power:  
150W RMS per Channel @ 4 Ohms, 300W RMS per Channel @ 4 Ohms, 7500W RMS per Channel @ 4 Ohms,  
1kHz, 0.1% THD 1kHz, 0.1% THD 1kHz, 0.1% THD  
100W RMS per Channel @ 8 Ohms, 200W RMS per Channel @ 4 Ohms, 500W RMS per Channel @ 4 Ohms,  
1kHz, o.1% THD  
1kHz, 0.1% THD  
1kHz, 0.1% THD  
(Bridge Mode, Mono)  
300W RMS @ 8 Ohms,  
1kHz, 1% THD  
(Bridge Mode, Mono)  
600W RMS @ 8 Ohms,  
1kHz, 1% THD  
(Bridge Mode, Mono)  
1500W RMS @ 8 Ohms,  
1kHz, 1% THD  
Total Harmonic  
Distortion (THD):  
Less Then 0.1% (20Hz - 20kHZ @  
8 Ohms  
Less Then 0.1% (20Hz - 20kHZ @ Less Then 0.1% (20Hz - 20kHZ @  
8 Ohms  
8 Ohms  
Frequency  
Response:  
(+/-01db, @ rated output power,  
8 Ohms): 20Hz - 20KHz  
(+/-01db, @ rated output power,  
8 Ohms): 20Hz - 20KHz  
(+/-01db, @ rated output power,  
8 Ohms): 20Hz - 20KHz  
Slew Rate:  
15V Per usec  
15V Per usec  
300  
15V Per use  
300  
Damping Factor @ 260  
8 Ohm:  
Impedance:  
20K Ohms Balanced  
20K Ohms Balanced  
20K Ohms Balanced  
10K Ohms Unbalanced  
10K Ohms Unbalanced  
10K Ohms Unbalanced  
Dimensions  
(LxWxH):  
13.25” x 19” x 1.75”  
336 x 482 x 44mm  
14” x 19” x 3.5”  
360 x 482 x 88mm  
14” x 19” x 3.5”  
360 x 482 x 88mm  
Weight:  
24lbs/11Kgs  
33lbs/15Kgs  
42lbs/19Kgs  
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©American Audio®  
American Audio® is part of the American DJ® Group of Companies  
American DJ® World Headquarters:  
4295 Charter Street Los Angeles, CA 90058 USA  
Tel: 323-582-2650 / Fax: 323-582-2610  
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