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
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
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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
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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
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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
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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
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5
Q1.1500D
Mono Amplifiers
Interconnectcablechecklist:
Connecttheinputs toasuitablesource,e.g.aheadunitwithgoodqualityRCAcables.
Controlchecklist:
Refertothesection“Settings for BestPerformance”
Use at least #12 gauge speaker wiring. The amps have dual speaker terminals,
simplifyingthehookupofmultiplespeakers.Theseamps aremono,1channel,amplifiers
which have multiple positive and negative connections for ease of wiring. The 2 positives
arethesameinternallyandthe2negatives arethesameinternally.
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
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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
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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.
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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
LEDlightingupunderthefollowingconditions:
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.
Shouldtheamplifiergointodiagnosticmode,simplydisconnectallRCAandspeakerleads,whilekeeping+12volt,powergroundandremoteleads connected.
1.Nowturntheamplifierbackon,andifthediagnosticLEDlights,theamplifierhas aninternalfault.
2.Ifnot,plugtheRCAcables back,andresettheamplifier.Ifitgoes intodiagnosticnow,thefaultlies intheinput,eitherwithbadcables orsourceunit.
3. Ifthe amplifierseems fine withRCAcables pluggedin, connectthe speakers, one ata time, andifone ofthe speakers orits wiringis faulty, itwillactivate the diagnostic
system.
Amplifierheatsink overheating
Theamplifiers willshutdownwhentheheatsinktemperaturereaches 80degrees centigrade,andturnbackononcetheunithas cooleddownbelowthatpoint.
Causes ofoverheating:
1-Inadequatecooling-relocateorremounttoprovidebetternaturalairflowoverthefins.
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
loudspeakerimpedance.
Low output power
1-Checkthatlevelcontrols havebeensetupproperly.
2-Makesurethatthebatteryvoltage,as measuredattheamplifier’s +12voltandgroundterminals,is 11volts ormore.
3-Checkall+12voltandgroundconnections.
Fusesblowing
1-Theuseofloudspeakerimpedances belowtherecommendedminimums willdrawmorecurrent-check.
2-Ashortonthemain+12voltcablefromthebatterytothevehiclechassis willcausethemainfusetoblow.
3-Ifanamplifierfuseblows continually,withonly+12volt,groundandremoteleads connected,theamplifiermaybefaulty.
Systemdoes not turnon
1-Checkallfuses.
2-Checkallconnections.
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 +12voltandremoteleads tolocalizetheproblem.
Noiseproblems
Systemnoisecanbedividedintotwocategories,hiss,andelectricalinterference.
Hiss, orwhite noise
1-Highlevels ofwhite noise usuallyoccurs whenamplifierlevelcontrols are turneduptoohigh-readjustaccordingtothe procedures insection”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
componentatatime.
Atickingorwhine that changes with engine RPM:
1-This problemcouldbecausedbyradiationpickupofRCAcables tooneartoafuelpumporadistributor,forinstance,-relocatecables.
2-Checkthattheheadunitgroundis connectedstraighttothevehiclechassis, anddoes notusefactorywiringforground.
3-Trytosupplytheheadunitwithaclean+12voltsupplydirectlyfromthebattery+,insteadofusingasupplyfromtheindashwiring/fusebox.
Aconstantwhine:
This typeofnoisecanbemoredifficulttopinpoint,butis usuallycausedbysomekindofinstability,causingoscillations inthesystem.
1-Checkallconnections,especiallyforgoodgrounds.
2-Makesurethatnospeakerleads areshortingtoexposedmetalonthevehiclechassis.
3-RCAcables arenotorious fortheirproblematicnature,socheckthatthesearegood,inparticulartheshieldconnections.
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70Amps x 2
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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.
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