Noise Thru speaker , amp shut down

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Member Since: Sep 20, 2008

Hi People,
I have a mackie1402-vlz mixer with an oldie but goodie Yamaha P-2200 power amp. THe speakers are EAW 3 ways (15'woofer).
I am trying to piece together a rig for DJ applications with this equipment as well as a band.
THe problem is when I shut down the power amp there is a noise that comes out of the speakers and slowly (2-3 seconds) disipates. I shut down amp prior to mixer. There is nothing else in line.
I am sure this can't be helpful to the speakers. Is this common or is there something wrong with this older amp? Would a compressor solve the issue or mask it?
Regards and many thanx,
joncor

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MASSIVE Mastering, LLC
Member
Since: Aug 05, 2008


Sep 20, 2008 11:31 am

Unplug the speaker just before shutting down the amp.

The Czar of BS
Member
Since: Dec 31, 2007


Sep 20, 2008 12:34 pm

What you are hearing is the problem with older linear amps.

With that Yamaha amp, you are hearing the capacitor discharge throw the speaker.

Since this is after the signal chain, no amount of processing will eliminate this for you.

You can have the repaired. The cost will not be astronomical. And it is an easy repair.

I would suggest purchasing a different amp. The older Yamaha's have a crest factor issue. They have a tendency to devour speakers.

Take a look at some of the newer QSC PLX amps. You will not have the shut down oscillation issue. And it will have a soft start as well.

Member
Since: Sep 20, 2008


Sep 21, 2008 09:43 am

Rob,
Are you saying that it is a leaking cap? This is a repair I should be capable to repair, once I find the correct cap.
I think I should repair this amp to sell it and take your advice and get something a little more modern. QSC's are great amps, but pricy. I am not really to sure how many watts I'll need.
THen again,,the Matrix 1000v2 B-52 live sound systems look pretty good. I could always use this present system as a backup. THank you for you help.
Regards,
john

Prince CZAR-ming
Member
Since: Apr 08, 2004


Sep 21, 2008 06:24 pm

I'd guess that a cap is just discharging. Normal, based on the circuit it's in. Probably not a leaky one.

Like Rob mentioned, it can be re-worked so it doesn't do it anymore, for probably pretty cheap. Or DIY if you can get a schem or are good at not getting toasted inside an amp.

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