Stanton Stereo Amplifier A1800 User Manual

A.900 / A.1800 / A.2800  
HEAVY DUTY PROFESSIONAL AMPLIFIERS  
USER MANUAL  
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INTRODUCTION  
Thank you for your decision to purchase Stanton’s innovative new A Series professional power amplifier! Engineered for superior sound  
reproduction, the A Series line of professional amplifiers deliver top quality audio at an affordable price. The A Series offer a standard of  
reliability and efficiency that makes them the perfect solution for every DJ, musician, and sound engineer. Welcome to a new level of pro-  
fessional quality sound performance!  
UNPACKING & INSTALLATION  
Although it is neither complicated to install, nor difficult to operate your amplifier, a few minutes of your time are required to read this  
manual for a properly wired installation, and to become familiar with the unit’s features. Please take great care in unpacking the unit and  
do not discard the carton and other packing materials. They may be needed when moving the unit and are required if it ever becomes  
necessary to return the unit for service. Never place the unit near a radiator, in front of heating vents, in direct sunlight, in excessive  
humidity, or dusty locations to avoid damages and to guaranty a long reliable use. Connect the unit with the system components accord-  
ing to the description on the following pages.  
FEATURES  
• Stanton amplifiers deliver the following power ratings.  
• A.900 - 2 x 210 Watts at 8 ohm, 2 x 320 Watts at 4 ohm and 2 x 420 Watts at 2 ohm  
• A.1800 - 2 x 400 Watts at 8 ohm, 2 x 600 Watts at 4 ohm and 2 x 900 Watts at 2 ohm  
• A.2800 - 2 x 600 Watts at 8 ohm, 2 x 900 Watts at 4 ohm and 2 x 1400 Watts at 2 ohm  
• 2-channel, parallel or bridged mono operating modes for flexible application 900 Watts for A.900, 1800 Watts for A.1800 and 2800  
Watts for A.2800  
• Independent limiters for each channel reduce distortion  
• Independent input level controls for each channel allow precision adjustments  
• Precise signal and clip LED indicators to monitor performance, allow you to correct for overloading (clipping) condition  
• Low-frequency filters (40 Hz) remove rumble and subsonic frequencies  
• Twin-tunnel and two temperature-sensitivity forced-air cooling system to maintain a low operating temperature during use  
• Balanced XLR or balanced 1/4-inch TRS Combination input connector for each channel and LINK ports  
• 5-way output binding posts or Speakon® connectors enable secure operation  
• High-current toroidal transformer for absolute reliability  
• Independent DC and thermal overload protection on each channel automatically protects amplifier and speaker from damage or failure  
• The A-Series can be mounted in any standard 19” rack  
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FRONT PANEL CONTROLS  
1. Rack Ears  
These ears are used to mount the amplifier in any standard 19”  
rack.  
6. Active Indicators  
2. Fan Vent  
These blue LED's indicate that AC power is connected and the  
amplifier is turned on.  
The A-Series amplifiers are cooled by two rear-mounted fans  
(except for A.900 which is cooled by a single rear mounted fan).  
Cool air flows through the front fan filters, reducing the tempera-  
ture internal components while forcing the heat out the rear vents.  
Never block these vents and keep them clean at all time.  
7. Protect Indicators  
These red LED's indicate that the channel is in Protect mode.  
When the channel goes into protect mode all output for that chan-  
nel will be muted. The protect LED's light when overheating or  
other severe problems occur. This is to protect any speakers con-  
nected to the channel. The LED's also light for approximately five  
seconds whenever the unit is powered on and fade slowly when  
the amplifier is powered off.  
3. AC Power Switch  
This switch powers the unit on and off.  
4. Signal Indicators  
These blue LED's will illuminate to indicate that a signal is pres-  
ent at the amplifier input, and that the signal is being amplified.  
8. Channel input level control  
These two 21-position detented potentiometers adjust input level  
for their respective amplifier channels. In Bridged Mono Mode,  
only channel 1 level control are used to adjust signal level. In  
Parallel Mode, both input level control are used to adjust signal  
level for their respective amplifier channels. At their fully counter-  
clockwise position, the signal is attenuated by more than 80dB. At  
their fully clockwise position, the signal is at unity gain. When 0  
dBu of signal arrives at the input jacks and the Channel input level  
controls are set to their fully clockwise position, the unit delivers  
full power output.  
5. Clip Indicators  
These red LED's will illuminate at the clipping threshold. These  
lights should not light up during normal use as they indicate sig-  
nal outside of the amplification range of the amplifier. When a sig-  
nal is "clipped" and the clip indicator illuminates, it means that the  
signal is being distorted at the output stage. Prolonged clipping  
can not only damage your amplifier, but also your speakers, so be  
careful to monitor the clip indicator during setup and use. If the  
clip indicator is illuminated then simply lower the channel gain or  
input signal until the indicator does not light.  
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REAR PANEL CONTROLS  
7. 5-way Binding Post  
1. Fan  
Connect each channel of the unit to 4 ohms or 8 ohms loudspeak-  
ers.Two pairs of 5-way binding posts are provided for each chan-  
nel, so that paralleling of speakers is possible. Connection to the  
binding posts can be made with bare wire, banana plugs, or  
spade lug terminations. Make connections to both the Channel 1  
and Channel 2 terminals for Stereo or Parallel Mode, or a single  
connection across the red terminals only of Channel 1 and  
Channel 2 for Bridged Mono Mode.  
This is a variable speed cooling fan. Cool air enters the amplifier  
through the fan filters located on the front of the amplifier. Be sure  
not to block these ports when installing the amplifier or other  
equipment.  
2. Input connectors  
Connect the input source to the balanced combo connectors  
using either XLR or 1/4” TRS plugs. They are configured as fol-  
lows : Pin 2 (Tip) hot, Pin 3 (Ring) cold, and Pin 1 (Sleeve)  
ground. We recommend using balanced three-conductor cabling  
wherever possible. Unbalanced two-conductor 1/4” plugs can  
also be inserted into these inputs, but you will get better signal  
quality and less outside noise and hum if you use balanced lines.  
Stereo signal should be connected to both the Channel 1 and  
Channel 2 input jacks. When operating the unit in Bridged Mono  
or Parallel modes, use the Channel 1 input jack only.  
8. Speakon® output connectors  
You can use these to connect each channel of the unit to 8 ohms  
or 4 ohms loudspeakers. Using Speakon® speaker cables, make  
connections to both the channel 1 and channel 2 connectors for  
Stereo or Parallel Mode, or to the Bridged mode connector for  
Bridged Mono Mode.  
9. Circuit breaker  
The breaker acts in place of common disposable fuses. This cir-  
cuit breaker will trip if there is a fault with the main voltage or if  
maximum output is exceeded. Simply depress the circuit breaker  
and power up the unit again.  
3. Link connectors  
These jacks are used to send a parallel signal to another device  
or amplifier.  
4. High Pass Filter (HPF) switch.  
10. AC input  
These switches are used to activate the built-in High Pass Filter.  
The HPF rolls off signals below 40Hz. This improves bass per-  
formance by limiting sub-audio cone motion, making more power  
available for the speaker’s rated frequency range. When the filter  
is turned off, a 5 Hz roll off protects against DC or deep sub-audio  
inputs.  
IEC connector for AC power cable. Connect the supplied heavy-  
gauge 3-pin IEC power cable.  
5. Limiter switch  
When the input signal connected to your amplifier is too high, you  
end up with a distorted output signal. To prevent this, both chan-  
nels feature a clip limiter that can be engaged or disengaged  
selectively.  
6. Bridge / Stereo / Parallel switch  
This switch changes the amplifier operating mode between  
stereo, mono bridged, and parallel.  
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PROTECTION  
Every model in the A-Series incorporates protection features. The front panel Protection LED indicates the activity of the relay speaker  
connection circuitry in each channel. When the protection LED turns on, this circuitry is active, and all connected speakers are muted.  
Initial power-up : For approximately five seconds after initial  
power-up, the protection circuitry is activated and the speaker  
outputs are muted. If everything is operating normally, you will  
hear an audible click at the conclusion of this brief period, as the  
protection circuitry is deactivated and the unit begins delivering  
signal to the connected speakers. It is normal for the Protection  
LED to fade gradually after the amplifier is powered off.  
Subsonic Frequency Protection : The built-in High Pass Filter  
provides subsonic frequency protection for each channel.  
Current limiting Protection : At the amplifier’s full power limit, or  
clipping point, the limiter circuitry will be activated. This is indicat-  
ed by illumination of the Clip LED. The channel gain is automati-  
cally reduced, protecting the speakers from high power.  
Uncontrolled feedback, oscillations, or improper equipment gain  
setting may activate this circuitry, which is virtually transparent in  
operation as full signal bandwidth is maintained.  
Thermal Protection : Abnormally high heat sink temperatures  
will engage the protection circuitry for the overheating channel  
only. An output relay disconnects the speakers until normal tem-  
perature range is restored. The Protect indicator will light to show  
the protection circuit is active. To guard against this problem,  
make sure the unit receives adequate ventilation on all sides and  
that both the front and rear panels are unobstructed. If the power  
transformer gets too hot, its thermal switch will disconnect all of  
the secondary power and disconnect both channel outputs.  
There is reason to be concerned any time the Protection LED  
lights up (except for initial power-up during approximately five  
seconds). If this occurs, turn the amplifier off immediately and  
check all wiring and external equipment carefully in order to  
locate and correct the condition.  
Short circuit : If output is shorted due to faulty wiring, the ther-  
mal circuitry will automatically protect the amplifier. If this occurs,  
the load will be disconnected by thermal protection circuitry.  
DC Voltage Protection : If an amplifier channel detects DC volt-  
age at the speaker output, the output relay will immediately open  
to prevent speaker damage.  
SETUP  
Clip limiter  
HPF (Hi-Pass Filter)  
Clipping is the result of an amplifier running into power supply lim-  
itation. The maximum output voltage that any amplifier can pro-  
duce is limited by its power supply. Attempting to output a voltage  
(or current) level that exceeds the power supply limit will result in  
a flattening effect on the signal. A clipped waveform exhibits  
extreme harmonic distortion, making it sound harsh or dissonant.  
The clip limiter detects this and reduces the gain to minimize the  
amount of overdrive. To preserve as much of the program dynam-  
ics as possible, limiting reduces the average program level until  
peaks barely clip. Each channel has its own clip limiter, which can  
be switched on or off. When driving full-range speakers, clip lim-  
iting reduces high frequency distortion caused by bass overload.  
It also protects higher frequency drivers from excess overdrive  
and harsh clipping harmonics.  
Also known as a low-cut filter, a High Pass Filter rolls off signals  
below 40Hz. The reproduction of the signal’s bass portion is thus  
optimized, since ultra-low, distracting frequencies are eliminated,  
and more power is available for the reproduction of the wanted  
segment of the signal.  
You should set up the filters so they best suit the frequency  
response of your speakers, since some speakers are particularly  
sensitive to over-excursion. The 40Hz filter works well with most  
compact full-range speakers.  
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SETUP  
CONNECTIONS  
Stereo Mode  
Mode Select  
(5-Way Outut Binding Posts)  
Stereo Mode  
In stereo mode, both channels operate independently with individ-  
ual input gain controls. Signal at channel 1’s input produces out-  
put at channel 1, while signal at channel 2’s input produces out-  
put at channel 2’s output. Recommended minimum nominal load  
impedance for stereo operation is 2 ohms per channel.  
Parallel Mode  
When set to Parallel mode, a signal applied to channel 1’s input  
will be amplified and appear at outputs for both channel 1 & 2.  
The parallel mode is well suited for applications in which driving  
two speakers with the same signal but with separate amplifica-  
tion.  
Parallel Mode  
(5-Way Outut Binding Posts)  
Bridged Mono Mode  
Bridged mono mode straps both amplifier channels together to  
make a very powerful, single-channel monaural amplifier. One  
channel ”pushes” and the other channel “pulls” equally, doubling  
the power over that of either channel alone. Therefore the voltage  
is doubled, the peak power is quadrupled, and program power is  
roughly three times as high as that of the individual channel.  
Signal is applied to the channel 1 input only and channel 1 input  
gain control is used to adjust signal level. The input gain control  
belonging to channel 2 are not used.  
Note : Bridged mono mode is to be used only when the A-Series  
is connected to a 4 or 8 ohms speaker load. Use of Bridged mode  
with speaker loads of 4 ohms or less can result in severe damage  
to the unit due to excessive heat and current limiting.  
Bridged Mono Mode  
Use extreme caution when operating the amplifier in  
Bridged Mono Mode. Never ground either side of the  
speaker cable; the speaker load must “ float “ away  
from the amplifier chassis.  
(5-Way Outut Binding Posts)  
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CONNECTIONS  
Stereo Mode  
SPK+ to PIN 1+  
SPK- to PIN 1-  
SPK+ to PIN 1+  
SPK- to PIN 1-  
SPK+ to PIN 1+  
SPK- to PIN 1-  
SPK+ to PIN 2+  
SPK- to PIN 2-  
Parallel Mode  
SPK+ to PIN 1+  
SPK- to PIN 1-  
SPK+ to PIN 1+  
SPK- to PIN 1-  
SPK+ to PIN 2+  
SPK- to PIN 2-  
SPK+ to PIN 1+  
SPK- to PIN 1-  
Bridged Mono Mode  
SPK+ to PIN 1+  
SPK- to PIN 2-  
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WIRING  
These are several ways to interface the amplifier to support a variety of applications.  
Unbalanced 1/4” Connector  
Unbalanced 1/4” Connector  
Balanced TRS 1/4” Connector  
XLR Balanced Wiring Guide  
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SPECIFICATIONS  
A.900  
A.1800  
Stereo Both Channel Driven  
400 W  
A.2800  
Rated Output Power  
8 ohms  
210 W  
320 W  
420 W  
600 W  
900 W  
1400 W  
4 ohms  
600 W  
2 ohms  
900 W  
Rated Output Power  
8 ohms  
Bridged Mono  
1200 W  
650 W  
845 W  
1800 W  
2800 W  
4 ohms  
1800 W  
Signal to Noise Ratio  
(20 Hz ~ 20k Hz)  
100dB  
102dB  
104dB  
Distortion (SMPTE-IM)  
Input sensitivity @8 ohms  
Voltage Gain  
0.05%  
4dBu  
30dB  
AB  
0.01%  
4dBu  
0.04%  
4dBu  
35dB  
H
33dB  
Output Circuitry  
Current Consumption  
@ 1/8 power @4 ohms  
@ 1/3 power @4 ohms  
@ Rated power @4 ohms  
Distortion  
AB  
120Vac / 240Vac  
7.2A / 3.5A  
12A / 6A  
4.5A / 2.2A  
7A / 3.6A  
8.5A / 4.1A  
17A / 8.3A  
32A / 16A  
10.5A / 5.5A  
19.5A / 9.5A  
0.01%  
0.1%  
0.01%  
0.1%  
0.03%  
0.1%  
20 Hz-20k Hz Half Power  
1k Hz Rated Power  
Frequency Response  
Damping Factor (400 Hz)  
Input Impedance  
Input Clipping  
0/-0.5dB ; 20Hz-20KHz, 0/-3dB ; 5Hz-60KHz  
200 280 350  
15Kohm Unbalanced, 30Kohm Balanced  
22dBu (10Vrms)  
Cooling  
Continuously variable speed, Front to rear  
Connectors (each)  
Input  
Active balanced combo (XLR and 1/4” TRS common use)  
5-way Binding post and Speakon®  
Output  
Control  
Front  
AC power switch, Channel 1 and 2 volume  
Rear  
HPF switch, Limiter switch, Mode selector switch  
Active(light blue), Protection(red), Clip(red), Signal (dark  
blue)  
Indicators  
Protection  
Short circuit, Thermal, Current limit, DC offset, Current  
inrush, RF protection, Turn on / Turn off muting  
Power requirements  
100v 50/60Hz(JP) 120V 60Hz(U.S.A. & Canada) 240V 50Hz(EU)  
19”(482mm) _ 3.5”(88mm) _ 16.5”(420 mm)  
Dimensions (W _ H _ D)  
28 lb  
(12.6 kg)  
40 lb  
(18 kg)  
46 lb  
(20.7 kg)  
Net Weight  
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SPEAKER COMPATIBILITY  
The A Series of amplifiers are designed to work with many different speakers on the market. They have been paired with the following  
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WARRANTY & RETURN POLICY  
Warranty  
Through Stanton’s authorized dealers around the World, Stanton, or one of Stanton’s authorized distributors outside the U.S., will, with-  
out charge, repair or replace, at the sole discretion of the entity responsible for making the repair or providing the replacement, any  
Stanton merchandise proved defective in material or workmanship for a period of three (3) years following the date of original purchase.  
Stanton will warrant all replacement parts and repairs for ninety (90) days from the date of original shipment. Repairs made necessary  
by reason of misuse, alteration, normal wear, or accident are not covered under this warranty.  
Returns  
Authorized Stanton dealers are only authorized to sell and distribute merchandise within a specific country. All goods requiring warranty  
repair or replacement must be returned (freight prepaid if not hand-delivered) to the authorized Stanton dealer from whom the merchan-  
dise was purchased and in the same country where the merchandise was purchased. For purposes of purchases made via the Internet,  
the merchandise must be returned to the authorized Stanton dealer in the country where the authorized Stanton dealer which sold the  
merchandise to purchaser is located and not the authorized Stanton dealer in the country where the purchaser is located or the country  
in which the merchandise was received. Any returns to a non-authorized dealer or to an authorized Stanton dealer not in the same coun-  
try as the merchandise was intended to be sold or as set forth above will void this warranty.  
To initiate a warranty repair, you must contact the authorized Stanton dealer from whom you purchased the merchandise, and follow such  
authorized Stanton dealer’s return policy.  
Stanton assumes no risk and shall be subject to no liability for damages or loss resulting from the specific use or application made of the  
merchandise. Stanton’s liability for any claim, whether based on breach of contract, negligence, infringement of any rights of any party,  
or product liability, and relating to the merchandise shall not exceed the price received by Stanton from your purchase of such merchan-  
dise. In no event will Stanton be liable for any special, incidental or consequential damages (including loss of use, loss of profit and claims  
of third parties) however caused, whether by the negligence of Stanton or otherwise. To the extent permitted by law and except as oth-  
erwise provided above, Stanton disclaims any express or implied warranties of merchantability or fitness for a particular purpose.  
The above warranty provides you with specific legal rights. You may also have additional rights, which are subject to variation from state  
to state and country to country.  
If there is a dispute regarding the warranty of merchandise that does not fall under the warranty conditions stated above, please include  
a written explanation with the merchandise when returned pursuant to the terms and conditions set forth herein.  
Stanton Magnetics, Inc, 3000 SW 42 St. Hollywood, Florida 33312.  
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NOTES  
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NOTES  
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