Power off thump in CS4080HZ

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Peter Richter
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Power off thump in CS4080HZ

Post by Peter Richter » Tue May 23, 2017 10:46 pm

Giddaye. I have a CS4080HZ power amp which has worked quite well for years now without a hitch.
Just lately there is quite a loud clunk in the speakers as it turns off.
The speaker protection relays sound like they are tuning on and off properly. The clunk seems to happen just as the relays go off.
There is no DC off-set when the unit is on.
It happens in both speakers.
All this happens still with no input connected.
switches are set for stereo mode
With signal connected, the amp seems to work as it should

Any ideas?
Last edited by Peter Richter on Tue May 30, 2017 11:12 pm, edited 1 time in total.
Peter Richter
Brisbane Audio Services - Sound and Lighting for Any Event
Brisbane, Australia
http://www.brisbaneaudioservices.com.au

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Peter Richter
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Posts: 701
Joined: Thu Mar 24, 2011 10:12 pm
Location: Woody Point, Queensland, Australia
Contact:

Re: Power off clunk in CS4080HZ

Post by Peter Richter » Tue May 30, 2017 11:11 pm

Ok... turns out it's only in one channel.
Maybe the contacts in the speaker protection relay are sticking.
Is that something that anyone else has seen ?
Peter Richter
Brisbane Audio Services - Sound and Lighting for Any Event
Brisbane, Australia
http://www.brisbaneaudioservices.com.au

Mcclamma
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Re: Power off thump in CS4080HZ

Post by Mcclamma » Wed Jul 12, 2017 3:45 am

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