MB QUART Car Stereo System REF1800 User Manual

REFERENCE  
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  
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REF4.50 / REF4.80 / REF1.800  
INSTALLATION INSTRUCTIONS  
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. Reference 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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INSTALLATION INSTRUCTIONS  
Settings for Best Performance  
REF4.50 / REF4.80  
General:  
At this point you are ready to get more specific on the settings for your amplifier.  
High Pass:  
-When in Hi Pass 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 oclock 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 Low Pass/Bandpass 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 oclock 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.  
-When in Flat/Full operation, the Low Pass crossover is bypassed.  
Bass Boost:  
This setting is a fixed bass boost at 45Hz that is variable from 0-9dB. 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 oclock 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 doesnt 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.  
-When in Hi Pass operation, this setting is bypassed.  
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.  
REF1.800  
General:  
At this point you are ready to get more specific on the settings for your amplifier.  
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 oclock  
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 Boost:  
This setting is a fixed bass boost at 45Hz that is variable from 0-10dB. 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 oclock 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 doesnt allow frequencies to the right of the desired setting to be reproduced. The 12 oclock 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.  
3
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TROUBLE SHOOTING  
Thekey to findingthe probleminamisbehavingsoundsystem istoisolatepartsofthatsystem ina logicalfashiontotrackdown thefault.  
Descriptionofthe Diagnosticsystem builtintoallMBQuart 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  
PROTECTLEDlightingupunderthefollowingconditions:  
1-Ashortcircuitontheloudspeakerleads.  
2-Aninternalamplifierfaultthatcauses aDCoffsetontheloudspeakeroutput.  
Shouldtheamplifiergointodiagnosticmode,simplydisconnectallRCAandspeakerleads,whilekeeping+12volt,powergroundandremoteleads connected.  
1.Nowturntheamplifierbackon,andifthediagnosticLEDlights,theamplifierhas aninternalfault.  
2.Ifnot,plugtheRCAcables back,andresettheamplifier.Ifitgoes intodiagnosticnow,thefaultlies intheinput,eitherwithbadcables orsourceunit.  
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  
diagnosticsystem.  
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  
recommendedloudspeakerimpedance.  
Low outputpower  
1-Checkthatlevelcontrols havebeensetupproperly.  
2-Makesurethatthebatteryvoltage,as measuredattheamplifiers +12voltandgroundterminals,is 11volts ormore.  
3-Checkall+12voltandgroundconnections.  
Fusesblowing  
1-Theuseofloudspeakerimpedances belowtherecommendedminimums willdrawmorecurrent-check.  
2-Ashortonthemain+12voltcablefromthebatterytothevehiclechassis willcausethemainfusetoblow.  
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,theheadunits +12voltandremoteleads tolocalizetheproblem.  
Noiseproblems  
Systemnoisecanbedividedintotwocategories,hiss,andelectricalinterference.  
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 afterinstallation forbest performance”  
2-Anothermajorproblemthatcancauseexcessive hiss, is anoisyheadunit-unplugtheamplifierinputRCAcables, andifthehiss levelreduces,thesourceunit  
is atfault.  
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,onecomponentatatime.  
Atickingorwhine that changes with engineRPM:  
1-This problemcouldbecausedbyradiationpickupofRCAcables tooneartoafuelpumporadistributor,forinstance,-relocatecables.  
2-Checkthattheheadunitgroundis connectedstraighttothevehiclechassis, anddoes notusefactorywiringforground.  
3-Trytosupplytheheadunitwithaclean+12voltsupplydirectlyfromthebattery+,insteadofusingasupplyfromtheindashwiring/fusebox.  
Aconstant whine:  
This typeofnoisecanbemoredifficulttopinpoint,butis usuallycausedbysomekindofinstability,causingoscillations inthesystem.  
1-Checkallconnections,especiallyforgoodgrounds.  
2-Makesurethatnospeakerleads areshortingtoexposedmetalonthevehiclechassis.  
3-RCAcables arenotorious fortheirproblematicnature,socheckthatthesearegood,inparticulartheshieldconnections.  
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4
REF4.50 / REF4.80  
BASS  
BOOST  
Ch1/2  
Ch3/4  
LOWPASS  
INPUT  
OUT  
LEVEL  
HIGHPASS  
LEVEL  
HIGHPASS  
POWER  
4-Channel Amplifiers  
PROTECTION  
9dB  
6V  
0.2V  
15Hz  
250Hz  
6V  
0.2V 15Hz  
250Hz  
30Hz  
250Hz 0dB  
4
2
FULL HIGH CLONE  
(Ch3/4)  
FULL HIGH LOW  
MODE  
FEATURES:  
- 2 Sets of RCA inputs  
- POWER LED: Indicates the powered up and turned on condition  
- LEVEL: Variable sensitivity from 0.2V to 6V  
- BASS BOOST: Adjustable 45Hz bass boost from 0dB to 9dB  
- Crossover functions  
- FULL: Bypasses all crossovers for full frequency operation  
- HIGH: Selects the built in HIGHPASS filter, variable from 15Hz to 250Hz  
- CLONE (Ch3/4): Will automatically duplicate the settings on Ch3/4 for Ch1/2  
- PROTECTION LED: Indicates a high voltage, low voltage, short circuit,  
hard clip, over heating or DC fault condition.  
- MODE: 2” indicates one set of RCA’s are being used. This will also pass signal to channels 3/4 through 1/2 inputs.  
3” indicates bridging channels 3/4 while running 1/2 in stereo. 4” indicates connecting 2 sets of RCA’s to 1/2 and  
3/4 inputs.  
- LINE OUTPUT: Full range RCA pass through.  
4 Channel Full Range Stereo:  
Control checklist:  
Interconnect cable checklist:  
- Refer to the section Settings for Best Performance”  
- Connect the four inputs of the amplifier to a Radio/CD with quality RCA cables.  
Switch setting checklist:  
- 1/2CH X-OVER: FULL  
Minimum final loudspeaker impedances:  
- 2 ohm per channel.  
- 3/4CH X-OVER: FULL  
MODE: “4” since 2 sets of RCA’s are connected.  
Ch3  
Ch4  
Ch1  
C2  
2 or 3 Channel System:  
- It is necessary to feed the SAME signal to both left and right inputs via a Y-adapter RCA cable.  
- Connect the mono speaker positive terminal to the Ch3 +, and its negative terminal to Ch4 - as  
shown.  
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:  
Switch setting checklist:  
- 1/2CH X-OVER: FULL  
- Connect the inputs of channel pair 1/2 to a suitable stereo source, e.g. a head unit  
with good quality RCA cables.  
- 3/4CH X-OVER: LOW (LOW PASS)  
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.  
- 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.  
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.  
Ch3  
Ch4  
MONO LINE INPUT  
Ch1  
Ch2  
STEREO LINE INPUT  
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5
REF1.800  
BASS  
BOOST  
REMOTE  
SUBSONIC LOW PASS  
LEVEL  
INPUT  
MODE  
Master  
Out  
R
L
Mono Amplifiers  
Slave Master  
In  
Out  
0dB 12dB 15Hz 55Hz 40Hz 150Hz 5V 0.2V  
Slave  
In  
FEATURES:  
- 1 Set of RCA inputs  
- LEVEL: Variable sensitivity from 0.2V to 5V  
- BASS EQ: Adjustable 45Hz bass boost from 0dB to 12dB  
- SUBSONIC: Variable from 15Hz to 55Hz  
- LOW PASS: Variable from 40Hz to 150Hz  
- MASTER OUT: Mono RCA signal to Slave amplifier when linking.  
- SLAVE IN: Mono RCA signal in from Master amplifier when linking.  
- MODE: Selectable Slave In and Master Out selection when linking amplifiers.  
- REMOTE: Connection for dash mount level control.  
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  
MIN  
MAXX  
MBQR-2  
TO BATTERY + 12 Volts  
VIA FUSE  
REMOTE TURN-ON  
CHASSIS GROUND  
DESIGNATED  
MONO OUTPUT  
FROM HEAD UNIT  
6
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REF1.800  
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.  
5. Route two 4 gauge power cables directly to the vehicle battery with an in-line fuse.  
6. Connect two 4 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.  
2. Plug the MBQR-2 level remote 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 Remote.  
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.  
- Use a nut, bolt and lock washer to secure the ground cable to the chassis ground.  
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.  
IMPORTANT: Please understand that each amplifier is stable to 1 Ohm, but when  
linking a pair as indicated below you can not link below 2 Ohms. You can successfully  
run one DVC 4 Ohm sub, two SVC 4 Ohm subs or two DVC 2 Ohm subs to get your 2  
Ohm final load.  
4. Make sure that the MASTER amps’ MODE switch is in the Master Out position. Next  
you need to make sure that the SLAVE amps’ MODE switch is in the Slave In position.  
MODE  
Slave Master  
MIN  
MAXX  
In  
Out  
MBQR-2  
DESIGNATED  
MONO OUTPUT  
FROM HEAD UNIT  
OUT  
MONO  
SUBWOOFER  
IN  
MODE  
Slave Master  
In  
Out  
OUT  
IN  
7
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320  
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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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9
Check out our videos of new products,  
events and technical tutorials at  
PART#S210  
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REF4.50 / REF4.80 / REF1.800  

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