Hi folks, one week ago I bought a TA-E9000ES as a bargain. At low volume level everything is fine, but cranking it up to -30db or so humming sounds occur, changing to membrane-shaking pops and booms at even higher level.
I´ve been searching all over the www, found service manuals and bulletins and more but nothing according to this problem.
My 9000´s software is 2.01; I´ve already tried any realease down from 1.10 but no cure.
Maybe someone here can give me an advice. Thanks a lot!
Hi smelly :)
The humming sound is associated with pops and crackles will be a DC offset voltage getting into the DC coupled stages of the power amp. The humming is the power supply sagging under the excessively high current being drawn. Not a good idea to continue using it in this condition. I am very surprised that the speaker protection is not kicking in, and may even have been modified in some way for it to NOT engage by the previous owner of a patch it up back-yard tech. . This could well blow your speakers and damage the amp extensively. I would advise not to use it into speakers at this point.
We may have to to and fro a little to get to the bottom of it if you can answer a few questions to eliminate some things
Firstly, is it there on all channels.
regards
robotek
If the pops appear to have been coming from all channels, you may have a power supply rail failing producing the DC offset. This could be to the preamp stages, or even the main rails to the power amp. A dry jointed rectifier smoothing cap (the biggest ones in the amp) may also produce the symptom.
Do you have anyway of setting the amp up on a bench top with the lid off for some tests. A pair of old headphones would be handy also, rather than blow you speakers.
oh, just realised, this just the preamp processor. Forget the comment about speaker protection being modified. BUT still be wary using it unless you can reduce the gain right down on your poweramp.
Do you have the ta-n9000 as well?
Can you comment back when you get any of this post please. Cheers
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If you can wait for one of our sound system techs to see this, you'll get a definitive answer.
Me, I think its ground loop feedback from your description. The wall sockets you're plugging into may not be grounded properly themselves.
Repeat first sentence.
Regards,
Worldvet
Hi sir please check the speaker ratings what you have so that it can vary to humbling sound[how much watt speaker you are using sir].. if any assist i am there to solve it// thank u..rate it
The cracking and humming sound is because of the improper earthing
You will need to replace the power amp IC and the pre amp and it will need to be tested to make sure there are no other components that need replacing
the humming sound is probably from the voltage put into the power amp for amplifying but is not fully amplifying the audio stream in
I say pre amp also because that may be the cause for the power amp failing in providing a clear signal to the power amp
and there may be a component causing this pre amp to fail also
if you continue to listen to it then keep it low and don't use it much untill you can get the repair done
electech
but get the repair done soon! or you may be buying a new set of speakers!
because if it completely fails and a full voltage is sent thru the amp then your speakers will blow in an instant
there is no telling what the amp will do at this point except that its on its way to failing , it may just quit or just keep sending voltage out and blow any speaker you hook up
I would advise getting the repair done imediately
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Use speakers of higher RMS than amplifier's output and see results.
Ampifiers output filter circuit needs to be checked . Better take it to a special electronics service station to troubleshoot it
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