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Topic: Clipping on older QSC amp
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Steve Guttag
We forgot the crackers Gromit!!!
![](http://www.film-tech.com/ubbmembers/268e.gif)
Posts: 12814
From: Annapolis, MD
Registered: Dec 1999
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posted 12-06-2000 06:52 PM
Cory,Since you say it is a 1400. One quick visual check that the 1400 is ok is to observe the clip LEDs at power on....when the anti-thump circuit times out, the clip LEDs with have a very quick "blip" in unison...if they don't or just one does, I have always found a problem inside. Also, how does the speaker sound before the "clipping?" Clean or not? A premature clipping on a channel can also indicate a load problem...the clip LED will turn on when the channel distorts, regardless of the reason. Steve ------------------ "Old projectionists never die, they just changeover!"
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Steve Guttag
We forgot the crackers Gromit!!!
![](http://www.film-tech.com/ubbmembers/268e.gif)
Posts: 12814
From: Annapolis, MD
Registered: Dec 1999
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posted 12-09-2000 08:18 AM
John even if the amp is in bridge mode and he connects the speaker to one red and one black terminal, it would still work fine.The bridge mode merely inverts phase on the input to create an inverted ouput on channel two. Channel one behaves the same regardless...you could even connect another speaker on channel 2 between the black and red posts and merely have an out of phase speaker. So the question is....is it the speaker or the amp that is having difficulties. Disconnect the load (speaker) from the amp. Turn the amp off...wait 20 seconds and then turn it on and observe the clip LEDs...if either stays on for any time or doesn't "blip" after about 5 seconds (they will do it in unison ) after turn on, the amp needs service. Another thing you can try is to put your speaker on the other channel (move the input over as well and see if the problem moves. Steve ------------------ "Old projectionists never die, they just changeover!"
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