MB QUART QAA1000 User Manual download pdf (Page 12)

OPERA

TION

1. Turn volume on head unit to minimum.

2. Disable any signal enhancement systems (i.e. external processors, bass and treble controls set to 0,

Loudness OFF, etc).

3. Disconnect speakers from amplifier output terminals.

4. Turn Gain to minimum on all channels.

5. Set input sensitivity switch(s) to HIGH.

6. Set the LOAD switch to correspond to your speaker load (2 or 4-Ohm).

7. Insert the test disc (use a 45Hz test tone for subwoofer applications and a 1kHz for midrange and

tweeter applications at the appropriate level (see above note)).

8. Turn volume on the head unit up to the loudest desired listening level (typically around 3/4 of

maximum) some source units will not clip even at max volume with an all high bits signal, if your

source unit has these high performance characteristics, turn the volume to maximum.

9. Rotate the gain adjustment wheel to the right until the LED Clip indicator changes from green to

orange.

10.Back the gain down to the point where the LED returns to green again (if the gain is at its maximum

and the Clip indicator has not turned orange yet, lower the gain to minimum, set the sensitivity switch

to LOW and repeat step 9).

11.The value on the READ display now shows the amount of amplification required in decibels, you can

rotate the other gain adjustment wheel (on 2 and 4-channel models only) until gain values match.

If the load impedance selector switch is reconfigured following this gain setup process, please repeat the

process, failure to do so will result in inaccurate clipping levels and may clip early or late by 3 dB! The

difference in load impedance will cause the signal to clip at different voltages but will always maintain the

same power level.

TROUBLESHOOTING

Amplifier Does Not Turn On

Possible Cause

The in-line fuse on battery positive

cable is blown.

Poor ground connection

Poor power connection or power

outside acceptable range.

Solution

Check in-line fuse on battery positive cable. Replace if necessary.

Verify that Ground connection is connected to clean metal on the

vehicle’s chassis. Repair/replace if necessary.

Verify there is 10.5 - 15.5 Volts present at the positive battery and

remote turn-on cable. Verify quality connections for both cables

at amplifier, stereo, and battery/fuseholder. Repair/replace if

necessary.

No Sound Coming From Amplifier

Possible Cause

Poor RCA connections.

Poor speaker connections

Bad source unit

Solution

Verify good RCA input connections at source and amplifier. Check

entire length of cables for kinks, splices, etc. Test RCA inputs for

AC voltage with the source unit on. Repair/replace if necessary

Use an ohm meter to check speaker wire integrity. Check entire

length of wires for kinks, splices, etc. Repair/replace if necessary.

Connect RCA input from test source directly to amplifier input. If

this solves the problem, have the source unit repaired or replaced.

If not, have the amplifier checked by a qualified technician.

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MB QUART QAA1000 User Manual Page 12

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