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Old 16th August 2008, 11:14 AM   #1
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Unhappy persisting clipping after overloading

Hello, I own a 2 way active speaker (cca. 200W), which we use for singing on rehearsals with band. The problem is that we are nuts and play veery loud so the amp is somehow clipping and I couldt hear my singing. I think that problem is in amplifier, not in speakers, because they are very strong and clipping is comming from both of them. the clipping is weird to me, because I didnīt hear something like that before. When the signal is very high, the amp stops playing for a while, like when you swith the amp on and off very fast.
To describe the clipping- the HF speaker is making some cracking noise while the LF speaker is visibly pumping back and forth.
Another important thing is that the clipping sometimes persists even after I unplug the input signal or just stop playing/singing.

My question is: is the amplifier just too weak and we should buy a bigger one? If so, what does the persisting clipping mean? Or is some component in the amp diing so it couldnīt handle high signal?
Thank you for any advice.
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Old 16th August 2008, 12:14 PM   #2
AndrewT is offline AndrewT  Scotland
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seems more like some form of protection/limiting being triggered
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Old 19th August 2008, 03:05 PM   #3
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Quote:
Originally posted by AndrewT
seems more like some form of protection/limiting being triggered
Yes, could be, because it moves the bass speaker the same way as if I switched the amp off. I saw some transistors on the crossover PCB, is this some kind of protection? I measured these transistors with diode test and they seem to be OK, is there another way to check if there is really some problem with this crossover/protection part?
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Old 19th August 2008, 04:13 PM   #4
AndrewT is offline AndrewT  Scotland
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how hot does it get when the problem shows itself?
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Old 20th August 2008, 01:45 AM   #5
Bonsai is offline Bonsai  Taiwan
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dont sing so loud.
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Old 20th August 2008, 02:12 PM   #6
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Quote:
Originally posted by AndrewT
how hot does it get when the problem shows itself?
You mean temperature? Itīs not hot at all.
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Old 20th August 2008, 02:24 PM   #7
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Default When you have Leds installed into the feedback line, to detect clipping...


and this means the presence of DC into the output line... then if you have also big off set voltage.(misadjustment or output transistor junction leakage)... even without audio, the Led will ligth "on" because of DC presence in the output line.

Also the protection circuit may create that mess too.

Have to measure and to check... first suspect is off set into the output.... followed by the protection circuit that may be operating because of this off set or malfunction into the protection circuit.

regards,

Carlos
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Old 22nd August 2008, 07:44 AM   #8
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Default Re: When you have Leds installed into the feedback line, to detect clipping...

Quote:
Originally posted by destroyer X

and this means the presence of DC into the output line... then if you have also big off set voltage.(misadjustment or output transistor junction leakage)... even without audio, the Led will ligth "on" because of DC presence in the output line.

Also the protection circuit may create that mess too.

Have to measure and to check... first suspect is off set into the output.... followed by the protection circuit that may be operating because of this off set or malfunction into the protection circuit.

regards,

Carlos
Unfortunatelly I have this LED installed into preamp section and this rarely lights on.
So I should measure DC voltage on the output of amp?

I didnīt also check the preamp so I think I will unsolder the preamp output and connect another preamp to the power amp section and see what happens...
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