Maxxsonics Q4150 User Manual

Q
Lower power amplifiers will clip earlier than their more powerful cousins,  
and cause loudspeaker failure when overdriven, due to the harmonics  
generated by a clipped signal, thus overheating voice coils.  
Installation Manual  
Amplifiers should be mounted with the fins running horizontally for best  
convection cooling, to minimize overheating. Purchase the best quality  
RCA cables you can afford, for reliability and less engine noise  
interference in the audio system.  
Congratulations!  
By purchasing an amplifier from MB Quart, you have decided on a product  
of the highest technical quality. MB Quart wishes you great enjoyment with  
your amplifier. Should you have any questions about this system or other  
MB Quart products, please email us at [email protected]  
It is highly recommended that the amplifier be mounted to a board of MDF  
or other solid structure using the 4 mounting screws provided. Avoid  
mounting the amplifier to metal as this can introduce noise and other  
unwanted issues. When mounting the amplifier, ensure that it is mounted  
HORIZONTALLY, as shown in the diagram above, for optimal heat  
dissipation. Mounting amplifiers to speaker enclosures is not  
recommended as this can cause damage to the amplifier components.  
When choosing a location for mounting the amplifier, ensure that you  
check for clearance from wires, gas tank, electrical devices and brake  
lines etc.  
System Design  
The success of any car stereo system relies on several factors, such as  
the system design, execution of the installation, and system setup. Please  
remember that any system is only as good as its weakest link.  
Please remember that higher power systems are not necessarily useful  
purely for high sound pressure levels, but also to establish a headroom  
capability, to reproduce musical peaks cleanly without distortion.  
WOOD  
CLIP INDICATOR  
AMBER-  
CLIP INDICATOR  
AMBER-  
GREEN-  
PRE CLIP  
SOFT CLIP  
RED-  
ARD CLIP  
GREEN-  
PRE CLIP  
SOFT CLIP  
RED-  
ARD CLIP  
LEVEL  
LEVEL  
9V  
0.2V  
9V  
0.2V  
BASS BOOST  
BASS BOOST  
0dB  
12dB  
0dB  
12dB  
BASS FREQUENCY  
MULTIPLIER  
FREQUENCY  
30Hz  
80Hz  
X15  
X1  
HIGH PASS  
FILTER SLOPE  
6dB  
12dB  
15Hz  
1KHz  
CHANNELS 1&2  
HIGH PASS  
CHANNELS 3&4  
LOW PASS  
(x1) 20Hz  
(x15) 300Hz  
300Hz  
4.5KHz  
40Hz  
4.5KHz  
CROSSOVER  
CROSSOVER  
LP-BP LP-BP HP-FULL  
MONO STEREO  
DUPE  
(3&4)  
HP-FULL  
INPUT MODE  
PROTECT  
POWER  
4CH  
2CH  
Q4.80 / Q4.150 / Q1.1500D  
General Instructions  
General:  
Run the wiring so that RCA cables are at least 18“ away from power and speaker cables. Keep RCA cables away from electrical devices in the vehicle  
that can cause electrical noise, such as electric fuel pumps, emission control modules and other on-board electronic modules.  
Power and ground connections:(See table below)  
Use a sufficient gauge power cable and ground cable using the chart below as reference to what size wire you require. Q series amplifiers require at  
least 4 gauge power wire. In a multi amplifier system, add the total value of the manufacture recommended fusing to get your total system amperage.  
Some applications may require multiple runs of power wire to meet the system requirements. In multi amplifier systems it is advisable to mount a large  
enough fuse right at the battery, and run one or multiple +12 volt power cables to a fused distribution block near the amplifiers. It is then a simple  
matter to connect the +12 volt terminal of each amplifier to the distribution block. During this process, please ensure that the main power fuse is  
removed to avoid shorting the electrical system. The main fuse must be within 12” of the vehicles battery.  
Ground each amplifier with as short a ground lead as possible directly to the vehicle chassis using at least 4 gauge wire or equivalent to the size of the  
amplifiers’ power wire. Use a ground distribution block, if you wish, but it is extremely important to keep the main ground lead from this distribution  
block to the chassis as short as possible , not more than 12“. The ground connection integrity to the chassis is very important, and the best way to  
achieve a good, solid electrical and mechanical contact is to use a large round crimp lug, crimped and soldered to the ground cable. The next step is to  
scrape the paint off the vehicle chassis , slightly larger than the ground lug, at the connection point. Drill a clearance hole in the chassis, the same size  
as the lug hole, and use a bolt, spring washer and nut to securely fasten the ground lug. Use petroleum jelly to coat the bolt/lug connection, to prevent  
oxidization with time.  
TIP: Use the same approach when installing head units, equalizers or any audio equipment for that matter - run short individual grounds from each  
piece directly to the vehicle chassis, to minimize ground loops and system noise. All power, ground and speaker connections should be crimped and  
soldered for reliability. Make sure that none of the cable insulation can chafe against exposed metal in the vehicle, causing short circuits to the  
chassis.  
Safe connection sequence:  
After all cables are run, connect speaker wires to the speakers and amplifiers, then run and plug in RCA cables. Next, connect all power, ground, and  
remote turn on leads. Now connect all +12 volt cables to the amplifier/s and distribution blocks and fuse holders. Finally, connect the main +12 volt  
cable to the battery, with the main fuse removed, and we are almost ready to power up the system.  
Power up the system:  
The following procedure may seem like overkill, but there is nothing more frustrating when turning on a system for the first time, and it does not work  
properly immediately.  
First, make sure the head unit is off, and turn all level controls to minimum (counterclockwise), including the head unit volume control. Set all equalizers  
to 0 dB (no boost), and all crossover frequency controls at approximate frequencies, as recommended by the loudspeaker manufacturer. Set all input  
selector and crossover switches as required for the application. Remove all amplifier fuses, and insert the main fuse at the battery. If the fuse does not  
blow, you can insert the fuse in one of the amplifiers, and we are ready to turn on the system. Turn the head unit on, insert a CD, or select a radio  
station, and increase the head unit volume control. If the system sounds fine, turn off the head unit, and install fuses in the remaining amplifiers, one by  
one, till the complete system is powered up and functioning properly.  
WIRE LENGTH  
SYSTEM  
AMPERAGE  
7-10 ft.  
10-13 ft.  
13-16 ft.  
16-19 ft.  
19-22 ft.  
22-28 ft.  
35-50  
8
6
4
4
4
2
6
4
4
2
2
0
4
4
2
2
0
0
4
4
2
2
0
0
4
4
2
2
0
0
4
2
0
0
0
0
50-65  
68-85  
85-105  
105-125  
125-150  
2
Q4.80 / Q4.150 / Q1.1500D  
Features  
Q4.80  
Q4.150  
- CLIP INDICATOR:  
- GREEN = Pre-Clip  
- AMBER = Soft Clip  
- RED = Hard Clip  
- LEVEL: Variable sensitivity from 0.2V to 9V  
CLIP INDICATOR  
AMBER-  
CLIP INDICATOR  
AMBER-  
SOFT CLIP  
RED-  
HARD CLIP  
GREEN-  
PRE CLIP  
SOFT CLIP  
RED-  
HARD CLIP  
GREEN-  
PRE CLIP  
LEVEL  
LEVEL  
- BASS BOOST: Variable bass boost from 0dB to 12dB  
- BASS FREQUENCY: Frequency to be boosted, variable from 30Hz to 80Hz  
- HIGH PASS:  
9V  
0.2V  
9V  
0.2V  
BASS BOOST  
BASS BOOST  
- CH3&4: Variable HIGH PASS filter from 15Hz to 1KHz  
- CH1&2: Variable HIGH PASS filter from 20Hz to 300Hz  
- MULTIPLIER FREQUENCY: Available for CH1&2 only and variable selector  
for x15 or x1 the selected HIGH PASS value  
0dB  
12dB  
0dB  
12dB  
BASS FREQUENCY  
MULTIPLIER  
FREQUENCY  
- FILTER SLOPE: Roll off for HIGH PASS on CH1&2, selectable at 6dB or 12dB  
- CROSSOVER:  
- CH3&4:  
30Hz  
80Hz  
X15  
X1  
HIGH PASS  
FILTER SLOPE  
- LP-BP MONO: Selected when bridging CH3&4 on subwoofers  
- LP-BP STEREO: Selected when running CH3&4 in stereo on subwoofers  
- HP-FULL: Selected when running CH3&4 in stereo for full range speakers  
- CH1&2:  
6dB  
12dB  
15Hz  
1KHz  
CHANNELS 1&2  
HIGH PASS  
CHANNELS 3&4  
LOW PASS  
- DUPE (3&4): Bypasses all variables on CH1&2 and duplicates settings from CH3&4  
- HP-FULL: Selected when running CH3&4 in stereo for full range speakers  
- PROTECT: Red LED which indicates PROTECTION  
- POWER: Green LED which indicates the amplifier is “ON”  
- INPUT MODE:  
- 4CH: Selected when two sets of RCA’s are being connected to CH1&2 and CH3&4  
- 2CH: Selected when only one set of RCA’s are being connected to CH1&2. The amp  
will automatically provide signal to CH3&4 but there will be no FADE from front to  
rear on your headunit controls.  
(x1) 20Hz  
(x15) 300Hz  
300Hz  
4.5KHz  
40Hz  
4.5KHz  
CROSSOVER  
CROSSOVER  
LP-BP LP-BP HP-FULL  
MONO STEREO  
DUPE  
(3&4)  
HP-FULL  
INPUT MODE  
PROTECT  
POWER  
4CH  
2CH  
- PROTECT: Red LED which indicates PROTECTION  
- POWER: Green LED which indicates the amplifier is “ON”  
- CLIP INDICATOR:  
Q1.1500D  
GREEN-PRE CLIP  
AMBER-SOFT CLIP  
RED-HARD CLIP  
PROTECT  
- GREEN = Pre-Clip  
- AMBER = Soft Clip  
POWER  
CLIP INDICATOR  
- RED = Hard Clip  
- LEVEL: Variable sensitivity from 0.2V to 9V  
CONTROL  
LEVEL  
Q-LINK  
- Q-LINK: Allows linking of two Q1.1500D amplifiers to produce 3KW rms @ 2-Ohms  
- INPUT SLAVE: Selected when amplifier is being linked as SLAVE and receiving  
signal from the MASTER amplifier. When in INPUT SLAVE position all other  
adjustments are bypassed  
INPUT  
SLAVE  
OUTPUT  
MASTER  
9V  
0.2V  
PHASE SHIFT  
SUBSONIC  
- OUTPUT MASTER: Selected when amplifier is being linked as MASTER and  
providing signal to the SLAVE amplifier. This amplifiers’ adjustments now  
control both amps  
0
180  
15Hz  
35Hz  
PARAMETRIC BASS EQ  
- PHASE SHIFT: Adjustable time alignment from 0 to 180 degrees  
- SUBSONIC: Variable from 15Hz to 35Hz  
- LOW PASS: Variable from 35Hz to 200Hz  
BASS BOOST  
LOW PASS  
- BASS BOOST: Variable bass boost from 0dB to 12dB  
- BASS FREQUENCY: Frequency to be boosted, variable from 30Hz to 80Hz  
- BANDWIDTH: Range of frequencies to be boosted  
- Variable from WIDE to NARROW. WIDE includes less frequencies to be boosted  
while NARROW includes more frequencies to be boosted above and below the  
selected frequency  
35Hz  
200Hz  
0dB  
12dB  
BANDWIDTH  
BASS FREQUENCY  
30Hz  
80Hz  
WIDE  
NARROW  
PRE-AMP X-OVER  
3
Q4.80 / Q4.150  
4-Channel Amplifiers  
4 Channel Full Range Stereo:  
Interconnect cable checklist:  
INPUT MODE: 4CH since 2 sets of RCA’s are connected.  
- Connect the four inputs of the amplifier to a Radio/CD with quality RCA cables.  
Switch setting checklist:  
- 1/2CH X-OVER: HP-FULL  
Control checklist:  
- Refer to the section “Settings for Best Performance”  
- MULTIPLIER FREQUENCY: X1  
- FILTER SLOPE: 12dB  
- 3/4CH X-OVER: HP-FULL  
Minimum final loudspeaker impedances:  
- 2 ohm per channel.  
CLIP INDICATOR  
AMBER-  
CLIP INDICATOR  
AMBER-  
GREEN-  
PRE CLIP  
SOFT CLIP  
RED-  
HARD CLIP  
GREEN-  
PRE CLIP  
SOFT CLIP  
RED-  
HARD CLIP  
LEVEL  
LEVEL  
9V  
0.2V  
9V  
0.2V  
BASS BOOST  
BASS BOOST  
0dB  
12dB  
0dB  
12dB  
BASS FREQUENCY  
MULTIPLIER  
FREQUENCY  
30Hz  
80Hz  
X15  
X1  
HIGH PASS  
FILTER SLOPE  
6dB  
12dB  
15Hz  
1KHz  
CHANNELS 1&2  
HIGH PASS  
CHANNELS 3&4  
LOW PASS  
(x1) 20Hz  
(x15) 300Hz  
300Hz  
4.5KHz  
40Hz  
4.5KHz  
CROSSOVER  
CROSSOVER  
LP-BP LP-BP HP-FULL  
MONO STEREO  
DUPE  
(3&4)  
HP-FULL  
INPUT MODE  
PROTECT  
POWER  
4CH  
2CH  
- Connect the mono speaker positive terminal to the Ch3 +, and its negative terminal to Ch4 - as  
shown.  
2 or 3 Channel System:  
Here we show how to use the 4 channel amplifiers as a 3 channel unit by taking  
advantage of the mono bridging capability of all MB Quart amplifiers. In order to create  
a 2 channel system, simply follow the example to also mono bridge channel pair 1/2.  
Interconnect cable checklist:  
- Connect the inputs of channel pair 1/2 to a suitable stereo source, e.g. a head unit  
with good quality RCA cables.  
- A MONO signal source is required to bridge channel pair 3/4, such as would be  
available from the mono sub bass output of an active crossover, whether standalone, or  
built into a head unit or equalizer.  
Switch setting checklist:  
- 1/2CH X-OVER: HP-FULL  
- MULTIPLIER FREQUENCY: X1  
- FILTER SLOPE: 12dB  
- 3/4CH X-OVER: LP-BP MONO  
INPUT MODE: 4CH, Stereo Left and Right to CH1&2 and MONO to CH3&4  
Important: Do not be tempted to connect the hot, or positive outputs, from any source  
together to obtain a mono signal, as this could very well damage the output stage of  
that source.  
Control checklist:  
- Refer to the section “Settings for Best Performance”  
Minimum final loudspeaker impedances:  
- 2 ohm per channel in stereo mode.  
- 4 ohm mono bridged.  
- It is necessary to feed the SAME signal to both left and right inputs via a Y-adapter  
RCA cable.  
MONO LINE INPUT  
CLIP INDICATOR  
AMBER-  
CLIP INDICATOR  
AMBER-  
GREEN-  
PRE CLIP  
SOFT CLIP  
RED-  
HARD CLIP  
GREEN-  
PRE CLIP  
SOFT CLIP  
RED-  
HARD CLIP  
LEVEL  
LEVEL  
STEREO LINE INPUT  
9V  
0.2V  
9V  
0.2V  
BASS BOOST  
BASS BOOST  
0dB  
12dB  
0dB  
12dB  
BASS FREQUENCY  
MULTIPLIER  
FREQUENCY  
30Hz  
80Hz  
X15  
X1  
HIGH PASS  
FILTER SLOPE  
6dB  
12dB  
15Hz  
1KHz  
CHANNELS 1&2  
HIGH PASS  
CHANNELS 3&4  
LOW PASS  
(x1) 20Hz  
(x15) 300Hz  
300Hz  
4.5KHz  
40Hz  
4.5KHz  
CROSSOVER  
CROSSOVER  
LP-BP LP-BP HP-FULL  
MONO STEREO  
DUPE  
(3&4)  
HP-FULL  
INPUT MODE  
PROTECT  
POWER  
4CH  
2CH  
4
Q4.80 / Q4.150  
4-Channel Amplifiers  
4 Channel Full Range Stereo With Mono Amp For Subwoofers:  
Interconnect cable checklist:  
-RCA’s from OUTPUT on 4CH amp to INPUTS on MONO amp.  
- Connect the four inputs of the amplifier to a Radio/CD with quality RCA cables.  
Switch setting checklist:  
- 1/2CH X-OVER: HP-FULL  
Control checklist:  
- Refer to the section “Settings for Best Performance”  
- MULTIPLIER FREQUENCY: X1  
- FILTER SLOPE: 12dB  
- 3/4CH X-OVER: HP-FULL  
Minimum final loudspeaker impedances:  
- 4CH Amp: 2 ohm per channel.  
- MONO Amp: 1 Ohm  
INPUT MODE: 4CH since 2 sets of RCA’s are connected.  
CLIP INDICATOR  
AMBER-  
CLIP INDICATOR  
AMBER-  
GREEN-  
PRE CLIP  
SOFT CLIP  
RED-  
HARD CLIP  
GREEN-  
PRE CLIP  
SOFT CLIP  
RED-  
HARD CLIP  
LEVEL  
LEVEL  
9V  
0.2V  
9V  
0.2V  
BASS BOOST  
BASS BOOST  
0dB  
12dB  
0dB  
12dB  
BASS FREQUENCY  
MULTIPLIER  
FREQUENCY  
30Hz  
80Hz  
X15  
X1  
HIGH PASS  
FILTER SLOPE  
6dB  
12dB  
15Hz  
1KHz  
CHANNELS 1&2  
HIGH PASS  
CHANNELS 3&4  
LOW PASS  
(x1) 20Hz  
(x15) 300Hz  
300Hz  
4.5KHz  
40Hz  
4.5KHz  
CROSSOVER  
CROSSOVER  
LP-BP LP-BP HP-FULL  
MONO STEREO  
DUPE  
(3&4)  
HP-FULL  
INPUT MODE  
PROTECT  
POWER  
4CH  
2CH  
FULL RANGE  
RCA PASS  
THROUGH  
MONO  
SUBWOOFER  
GREEN-PRE CLIP  
AMBER-SOFT CLIP  
RED-HARD CLIP  
PROTECT  
POWER  
CLIP INDICATOR  
CONTROL  
LEVEL  
Q-LINK  
INPUT  
SLAVE  
OUTPUT  
MASTER  
9V  
0.2V  
PHASE SHIFT  
SUBSONIC  
0
180  
15Hz  
35Hz  
PARAMETRIC BASS EQ  
CHASSIS GROUND  
REMOTE TURN-ON  
BASS BOOST  
LOW PASS  
35Hz  
200Hz  
0dB  
12dB  
TO BATTERY + 12 Volts  
VIA FUSE  
BANDWIDTH  
BASS FREQUENCY  
MIN  
MBQR-2  
MAXX  
30Hz  
80Hz  
WIDE  
NARROW  
PRE-AMP X-OVER  
5
Q1.1500D  
Mono Amplifiers  
Interconnectcablechecklist:  
Connecttheinputs toasuitable source, e.g. aheadunit withgoodquality RCAcables.  
Controlchecklist:  
Refertothesection “Settings for BestPerformance”  
Use at least #12 gauge speaker wiring. The amps have dual speaker terminals,  
simplifying thehookup ofmultiple speakers.These amps aremono, 1channel, amplifiers  
which have multiple positive and negative connections for ease of wiring. The 2 positives  
arethesame internally andthe2negatives arethesame internally.  
Minimum final loudspeakerimpedance:1-Ohm.  
MONO  
SUBWOOFER  
GREEN-PRE CLIP  
AMBER-SOFT CLIP  
RED-HARD CLIP  
PROTECT  
POWER  
CLIP INDICATOR  
CONTROL  
LEVEL  
Q-LINK  
DESIGNATED  
INPUT  
SLAVE  
OUTPUT  
MASTER  
9V  
0.2V  
PHASE SHIFT  
SUBSONIC  
MONO OUTPUT  
FROM HEAD UNIT  
0
180  
15Hz  
35Hz  
PARAMETRIC BASS EQ  
CHASSIS GROUND  
REMOTE TURN-ON  
BASS BOOST  
LOW PASS  
35Hz  
200Hz  
0dB  
12dB  
TO BATTERY + 12 Volts  
VIA FUSE  
BANDWIDTH  
BASS FREQUENCY  
MIN  
MBQR-2  
MAXX  
30Hz  
80Hz  
WIDE  
NARROW  
PRE-AMP X-OVER  
6
Q1.1500D  
Linking Mono Amplifiers  
DUAL AMP INSTALLATION PROCEDURE:  
1. Connect the amp LINE INPUTS to the Radio/CD player full range or mono line out  
puts with good quality RCA interconnect cables.  
2. Plug in the MBQR-2 remote level module into the amp REMOTE INPUT jack on the  
Master amp. This will allow the Master amp to control both Master and Slave amps  
with just one Bass Remote.  
5. Connect two 2 gauge ground cables directly to the chassis with in 36” of the amp.  
- Be sure to remove any paint or primer from the ground point.  
- Use a nut, bolt and lock washer to secure the ground cable to the chassis ground.  
6. Make sure the Master amp MASTER/SLAVE switch is in the OUTPUT MASTER  
position. Make sure the Slave amp MASTER/SLAVE switch is in the INPUT SLAVE  
position.  
3. Connect an RCA jumper cable from the Master amp MASTER OUTPUT to the Slave  
amp SLAVE INPUT. Note: This will “link” the amps so that the Master amp crossover  
switches will control both the Master and Slave amps. The Slave amp crossover  
switches will be bypassed.  
7. Connect the subwoofer(s) in accordance to the diagrams below.  
8. Connect a 12 gauge jumper from Master amp speaker - to Slave amp speaker - as  
shown below.  
The Linked pair of Q1.1500D’s are stable to 2 Ohms and will produce 3000wrms. Do  
not present anything under 2 Ohms to the linked pair or the amplifiers will be damaged.  
4. Route two 2 gauge power cables directly to the vehicle battery with an in-line fuse.  
Linking two amps for single or dual subwoofer application  
Amplifiers are stable to 2-Ohms linked  
(MASTER)  
GREEN-PRE CLIP  
AMBER-SOFT CLIP  
RED-HARD CLIP  
PROTECT  
POWER  
CLIP INDICATOR  
CONTROL  
LEVEL  
Q-LINK  
DESIGNATED  
MONO OUTPUT  
FROM HEAD UNIT  
INPUT  
SLAVE  
OUTPUT  
MASTER  
9V  
0.2V  
PHASE SHIFT  
SUBSONIC  
0
180  
15Hz  
35Hz  
PARAMETRIC BASS EQ  
BASS BOOST  
LOW PASS  
35Hz  
200Hz  
0dB  
12dB  
BANDWIDTH  
BASS FREQUENCY  
MIN  
MAXX  
MBQR-2  
30Hz  
80Hz  
MONO  
SUBWOOFER  
WIDE  
NARROW  
PRE-AMP X-OVER  
(SLAVE)  
GREEN-PRE CLIP  
AMBER-SOFT CLIP  
RED-HARD CLIP  
PROTECT  
POWER  
CLIP INDICATOR  
CONTROL  
LEVEL  
Q-LINK  
INPUT  
SLAVE  
OUTPUT  
MASTER  
9V  
0.2V  
PHASE SHIFT  
SUBSONIC  
0
180  
15Hz  
35Hz  
PARAMETRIC BASS EQ  
BASS BOOST  
LOW PASS  
35Hz  
200Hz  
0dB  
12dB  
BANDWIDTH  
BASS FREQUENCY  
30Hz  
80Hz  
WIDE  
NARROW  
PRE-AMP X-OVER  
7
Settings for Best Performance  
Q4.80 / Q4.150  
General:  
At this point you are ready to get more specific on the settings for your amplifier.  
High Pass:  
-When in HP-FULL operation, this setting acts as a low frequency cut off for your system reproduction. The point that you set it at cuts off any frequencies from reproduction beyond this point. The 12  
o’clock position is a great starting point. EXAMPLE: If you adjust the High Pass to 100Hz, the amplifier will not play frequencies below 100Hz but will play frequencies from 100Hz to the highest  
frequency the amplifier is capable of reproducing.  
-When in LP-BP operation, this setting acts as a low frequency cut off for your system reproduction aka Subsonic Filter. The point that you set it at cuts off any frequencies from reproduction beyond  
this point. The 12 o’clock position is a great starting point. EXAMPLE: If you adjust the High Pass to 60Hz, the amplifier will not play frequencies below 60Hz but will play frequencies from 60Hz to the  
chosen Low Pass frequency  
Filter Slope:  
Selectable roll off for High Pass setting which is variable at 6dB for a steep cut, or 12dB for a smooth rolloff.  
Bass Boost:  
This setting is variable from 0-12dB. This feature provides impact to your bass, but if not adjusted correctly, it can be over used and cause damage to your speakers and amplifiers. It is best to slowly  
turn this setting clockwise until the desired punch is felt. It is not recommended to exceed the 12 o’clock position unless listening at a low volume or a low recording quality as this can result in high  
distortion and possibly clipping.  
Bass Frequency:  
Selects the frequency to amplify with the Bass Boost. Variable from 30Hz-80Hz. 11o’clock is 45Hz for reference.  
Low Pass:  
The Low Pass control acts as a ceiling and doesn’t allow frequencies to the right of the desired setting to be reproduced. Turning the potentiometer all the way to the right is a great starting point.  
EXAMPLE: If you adjust the Low Pass to 120Hz, the amplifier will not play frequencies above 120Hz but will play frequencies from 120Hz to the chosen Hi Pass or Subsonic frequency.  
Level Control Setup:  
Ensure that the Level is turned completely to the left prior to turning the system on. Next you should insert a CD or cassette that you are familiar with to use as a reference, and turn the head unit  
volume control to about 80% of its full setting. The system sound level will of course be very low, and the following procedures will help you to match the amplifier input sensitivities properly to the  
head unit output signal level.  
It is important to match the amplifier LEVEL input sensitivity to the Radio/CD output sensitivity. This can be located in the Radio/CD manual.  
If the Radio/CD output sensitivity is 2 volts, then adjust the amplifier LEVEL input to 2 volts.  
If you are not sure what the Radio output sensitivity is, follow these general guide lines:  
Turn the level control up slowly, till you hear distortion, then back off a few degrees on the control. If at any point your amplifier goes into protection, you will need to turn the Level to  
the left a bit and then try again. If you reach a point where the output does not increase, stop turning the Level control to the right as the amplifier/speaker combo has reached its maxx  
output in this application.  
Q1.1500D  
General:  
At this point you are ready to get more specific on the settings for your amplifier.  
Phase:  
Time alignment, typically recommended at 0 degrees unless using multiple amps and subs in both the front and rear of the vehicle. The Phase can be adjusted to give the perception of bass reaching  
the listener at the same time regardless of location.  
Subsonic:  
This setting acts as a low frequency cut off for your system bass reproduction. The point that you set it at cuts off any frequencies from reproduction beyond this point. The 12 o’clock position is a  
great starting point. EXAMPLE: If you adjust the Subsonic to 25Hz, the amplifier will not play frequencies below 25Hz but will play frequencies from 25Hz to the chosen Low Pass frequency.  
Bass Frequency:  
This setting is used for selecting the frequency you want to focus your enhancement on. Suggested enhancement is from 35-45Hz, but you should be careful not to set enhancement below the F3 or  
-3dB point of your sub/enclosure combo.  
Bandwidth:  
This setting controls the amount of frequencies included in the Bass Boost. The bandwidth varies from narrow to wide in a pyramid style boost with the selected Bass Frequency value being the  
center.  
Bass Boost:  
This setting adjusts the amount of boost on the selected Bass Frequency and Bandwidth. This setting is variable from 0-12dB. This feature provides impact to your bass, but if not adjusted correctly, it  
can be over used and cause damage to your subwoofers and amplifiers. It is best to slowly turn this setting clockwise until the desired punch is felt. It is not recommended to exceed the 12 o’clock  
position unless listening at a low volume or a low recording quality as this can result in high distortion and possibly clipping.  
Low Pass:  
The Low Pass control acts as a ceiling and doesn’t allow frequencies to the right of the desired setting to be reproduced. The 12 o’clock position is a great starting point. EXAMPLE: If you adjust the  
Low Pass to 80Hz, the amplifier will not play frequencies above 80Hz but will play frequencies from 80Hz to the chosen Subsonic frequency.  
Level Control Setup:  
Ensure that the Level is turned completely to the left prior to turning the system on. Next you should insert a CD or cassette that you are familiar with to use as a reference, and turn the head unit  
volume control to about 80% of its full setting. The system sound level will of course be very low, and the following procedures will help you to match the amplifier input sensitivities properly to the  
head unit output signal level.  
It is important to match the amplifier LEVEL input sensitivity to the Radio/CD output sensitivity. This can be located in the Radio/CD manual.  
If the Radio/CD output sensitivity is 2 volts, then adjust the amplifier LEVEL input to 2 volts.  
If you are not sure what the Radio output sensitivity is, follow these general guide lines:  
Turn the level control up slowly, till you hear distortion, then back off a few degrees on the control. If at any point your amplifier goes into protection, you will need to turn the Level to  
the left a bit and then try again. If you reach a point where the output does not increase, stop turning the Level control to the right as the amplifier/subwoofer combo has reached its  
maxx output in this application.  
8
Trouble Shooting  
Thekeytofinding the problemin a misbehaving sound systemisto isolatepartsof thatsystemin alogicalfashion totrackdown thefault.  
Descriptionofthe Diagnosticsystembuilt into allMB Quart amplifiers  
The diagnostic system will shut down the amplifier, until reset by turning the head unit off, and back on. This state of affairs will be indicated by the front panel PROTECT  
LEDlighting upunderthefollowing conditions:  
Ashort circuit on the loudspeaker leads, an internal amplifier fault that causes a DC offset on the loudspeaker output, and a voltage drop or surge to an unsafe level for  
theamplifier.  
Shouldtheamplifier gointo diagnostic mode, simply disconnect all RCAandspeaker leads, while keeping +12volt, powergroundandremote leads connected.  
1. Nowturntheamplifier back on, andif thediagnostic LEDlights, theamplifier has aninternal fault.  
2. Ifnot, plug theRCAcables back, andreset theamplifier. Ifit goes into diagnostic now, thefault lies in theinput, either withbadcables orsource unit.  
3. If the amplifier seems fine with RCAcables plugged in, connect the speakers, one at a time, and if one of the speakers or its wiring is faulty, it will activate the diagnostic  
system.  
Amplifierheatsink overheating  
Theamplifiers will shut downwhentheheatsink temperature reaches 80degrees centigrade, andturnback ononce theunit has cooled downbelow thatpoint.  
Causes ofoverheating:  
1- Inadequatecooling - relocate or remount toprovide betternatural airflow over thefins.  
2 - Driving high power levels into low impedances - back off on the volume control, and/or make sure you are not loading the amplifier with less than the recommended  
loudspeaker impedance.  
Low output power  
1- Check thatlevel controls have beenset upproperly.  
2- Make sure thatthebattery voltage, as measured attheamplifier’s +12volt andgroundterminals, is 11volts ormore.  
3- Check all +12volt andgroundconnections.  
Fusesblowing  
1-Theuse ofloudspeaker impedances below therecommended minimums will draw more current - check.  
2-Ashort onthemain +12volt cable from thebattery tothevehicle chassis will cause themain fuse toblow.  
3- Ifanamplifier fuse blows continually, withonly +12volt, groundandremote leads connected, theamplifier may befaulty.  
Systemdoes not turnon  
1- Check all fuses.  
2- Check all connections.  
3 - Measure the +12 volt and remote turn on voltages at the amplifier terminals. If these are non existent or low, take voltage measurements at fuse holders, distribution  
blocks, theheadunit’s +12volt andremote leads tolocalize theproblem.  
Noiseproblems  
System noise can bedivided into twocategories, hiss, andelectrical interference.  
Hiss, orwhite noise  
1 - High levels of white noise usually occurs when amplifier level controls are turned up too high - readjust according to the procedures in section ”Setting up systems after  
installation forbest performance”  
2 -Another major problem that can cause excessive hiss, is a noisy head unit - unplug the amplifier input RCAcables, and if the hiss level reduces, the source unit is at  
fault.  
Electricalinterference  
The inside of an automobile is a very hostile electrical environment. The multitude of electrical systems, such as the ignition system, alternator, fuel pumps, air  
conditioners, to mention just a few, create radiated electrical fields, as well as noise on the +12 volt supply and ground. Remember to isolate the problem - first unplug  
amplifier input RCA cables, if the noise is still present, check the speaker leads, if not, plug the RCA’s back, and investigate the source driving the amplifier, one  
component atatime.  
Atickingorwhine that changes with engine RPM:  
1-This problem could becaused by radiation pickup ofRCAcables tooneartoafuel pump or adistributor, forinstance, - relocate cables.  
2- Check thattheheadunit groundis connected straight tothevehicle chassis, anddoes notuse factory wiring forground.  
3-Try tosupply theheadunit withaclean +12volt supply directly from thebattery +, instead ofusing asupply from thein dash wiring/fusebox.  
Aconstantwhine:  
This type ofnoise can bemore difficult topinpoint, butis usually caused by some kind ofinstability, causing oscillations in thesystem.  
1- Check all connections, especially for goodgrounds.  
2- Make sure thatnospeaker leads areshorting toexposed metal onthevehicle chassis.  
3-RCAcables arenotorious fortheir problematic nature, so check thatthese aregood, in particular theshield connections.  
9
70Amps x 2  
10  
OEM Integration  
Accessories  
MX-1 Premium High To Low Level Converter  
MX-3 Bass Controller  
* Converts High Level OEM speaker wires to Ultra Clean RCA  
Low Level Outputs  
* High Level Inputs: Accepts all types of High level Inputs  
including floating ground and high voltages up to 30 volts.  
* Audio Signal Sense / Hardwire Turn-On: Audio sense detects  
music signals from the OEM wires and activates the MX-1. As  
an option, the module also offers a remote turn-on wire.  
* Parametric Bass EQ: Features Bass Boost, adjustable Band  
Width (wide & narrow), Low Pass and Subsonic Filter.  
* Clipping Indicators: Visually indicates audio signals Pre-Clip,  
Soft Clip and Hard Clip  
* Balanced Line Output: Ultra clean DIN variable high voltage  
output for driving mono amps.  
* Remote Output: Driver circuit to turn on amplifier when  
module activates.  
* Parametric Bass EQ: Provides a wide array of subwoofer output signal  
shaping controls to enhance bass response and sound quality including  
Bass Boost, adjustable Bandwidth (wide and narrow), Low Pass and  
Subsonic Filter.  
* Accepts a wide range of incoming music signal levels while  
accommodating all types of head units and signal processors and  
controlling the output level to the amp to maximize a signal strength up to  
9 volts.  
* Clipping Indicators: Visual clipping indicators provide indication of  
damaging clipped signals to help protect the subwoofer(s) and amplifier.  
Includes pre-clip, soft-clip and full-clip indications.  
* Music Shaping: Shapes the music signal to achieve deep bass notes as  
low as 15Hz.  
* Bass Remote: Features for subwoofer Level control with built-  
in clipping indicators.  
* Input & Output Level Control: Allows for gain matching both  
radio and amplifier audio signals.  
* Bass Remote: Included bas Remote features built-in clipping indicators  
allows direct bass control from in-dask or under-dash.  
MX-2 Deluxe High To Low Level Converter  
MX-4 Add A Sub High To Low Level Converter  
* Converts High Level OEM speaker wires to Ultra Clean RCA  
Low Level Outputs  
* Converts High Level OEM speaker wires to Ultra Clean RCA Low Level  
Outputs  
* High Level Inputs: Accepts all types of High level Inputs  
including floating ground and high voltages up to 30 volts.  
* Audio Signal Sense / Hardwire Turn-On: Audio sense detects  
music signals from the OEM wires and activates the MX-2. As  
an option, the module also offers a remote turn-on wire.  
* High Level Inputs: Accepts all types of High level Inputs including  
floating ground and high voltages up to 30 volts.  
* Audio Signal Sense / Hardwire Turn-On: Audio sense detects music  
signals from the OEM wires and activates the MX-4. As an option, the  
module also offers a remote turn-on wire.  
* Remote Output: Driver circuit to turn on amplifier when module * Remote Output: Driver circuit to turn on amplifier when module activates.  
activates.  
11  
Check out our videos of new products,  
events and technical tutorials at  
PART#S510  
Q4.80 / Q4.150 / Q1.1500D  

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