Manual MB Quart dsc500 1 (page 9 of 16) (English, German)

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A M P L I F I E R S

ENG

INSTALLATION 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:

Use a sufficient gauge power cable and ground cable using the chart below

as reference to what size wire you require. Discus series amplifiers require at

least 10 mm

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 30 cm of

the vehicles battery. Ground each amplifier with as short a ground lead as

possible directly to the vehicle chassis using at least 10 mm

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 30 cm.

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.

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 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

chosen Low Pass frequency.

-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

o’clock position is a great starting point. EXAMPLE: If you adjust the High Pass

to 25Hz, the amplifier will not play frequencies below 25Hz but will play

frequencies from 25Hz to the chosen Low Pass frequency.

-When in Flat/Full operation, the High Pass crossover is bypassed.

Bass EQ:

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 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. 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.

2 or 3 way active systems (all):

Always start with the bass, or low frequency amplifier as a reference, by turning

its control up to the point where distortion is audible, and back it off some.

Now adjust the level control for the highs or tweeter channels in a 2 way

active system, to balance the highs to lows. In a 3 way active system, match

the midrange level to the bass, and then the highs to the midrange and bass.

It may be necessary to perform a few iterations of the midrange and highs

level control settings to achieve a satisfactory sound balance.

SETTING UP SYSTEMS AFTER

INSTALLATION FOR BEST PERFORMANCE

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MB Quart dsc500 1 Manual

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