Question about QSC MX1500A 2-Channel Amplifier

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Hello I have a Peavey CS 800 and a QSC 1450. They are overloading at the imput and generating low power to the speakers. What could cause this. I have checked the cables and the mixer is the same one I have run just this past weekend. Its a mackie 1604. I have switched out the mains and sends and still get the same result.

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  • Scott Frye
    Scott Frye Oct 05, 2010

    Are the 2 amps linked together?

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Posted on Jan 02, 2017

  • 4234 Answers

SOURCE: CS-800 buzz in channel a

First a couple of questions:

1) Is the level of buzz controlled by the volume control? Based upon your initial post I would think yes.

2)When you say you want to use the other amp as a regular amp, do you mean to drive a single speaker or more?

Dan

Posted on Feb 07, 2009

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First a couple of questions:

1) Is the level of buzz controlled by the volume control? Based upon your initial post I would think yes.

2)When you say you want to use the other amp as a regular amp, do you mean to drive a single speaker or more?

Dan

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3 Answers

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Hi Bill,

It's a log time ago that I repaired those amps., but I give it a shot.
There's a speakerprotection after the finals, what I remember it's a triac (SAC187, or something like that).
You will find it at a small pcb at the back of the amp. Normally it has three legs but the centre is cut away. If it's down you will measure 0 Ohm at the output, also with a switched off amp.

Thats all I can remember, it was about 25 years ago.

Maybe it helps,
Gerard

Jan 25, 2009 | QSC MX1500A 2-Channel Amplifier

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