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In Reply to: RE: Was there hiss before you removed those output caps? posted by Cougar on July 27, 2016 at 17:06:39
It's a common idea, especially here, that most audio products are poorly engineered and built to cost. Hence the reason for all these expensive upgrade components that are in many cases the same cheap part with a fancy skin applied - notably audiophile capacitors.
But if you believe that, then why would a cost cutting manufacture add coupling capacitors if they were not needed? I mean even the cheapest caps cost pennies not to mention the added board manufacturing costs.
Doesn't make much sense does it? This equipment is cheaply designed yet they add parts that serve no purpose?
Hmmm
Follow Ups:
Gusser,in this case one channel has .3mv and the other channel had 12mv. I think this is way below what one needs to worry about going to an amp even if the amp does not have input dc blocking amps but there are others out there who can correct this if incorrect. But, in fact my amp has input caps to block dc so there is no need for two sets of caps. The improvement in sound quality without the output caps, which were way way better than the crap that came with the unit, is dramatic. I believe the output dc blocking caps are put in out of an abundance of caution to prevent a problem in all situations. Hornblower is a good point person on this subject. T
Edits: 07/27/16
Is it possible that in your zeal to use the most robust possible parts, in terms of voltage and power ratings, that you've stuffed some physically over-sized parts into the chassis, especially capacitors, such that you then had to run much longer than original length leads from the new parts to the PCB or wherever they are supposed to connect? If so, this creates an antenna for RF, every time you do it. And hiss can result. I don't know who wrote that "hiss" is by definition a 3KHz noise (as you mentioned), but that is not far off the range where it might lie. You obviously cannot filter that out without losing a lot of music, which defeats your whole purpose in tweaking. I suggest you go back to the drawing board and take a look at whether you have some long leads in the circuit that are picking up stuff and amplifying it. And IF you still wish to install a filter, it had better be an RC type, not just a C, in this frequency range. Otherwise, your amplifier will be looking at a dead short at frequencies above cut-off. But fix the core problem is my recommendation. Then you won't need no stinkin' filter.
Lew, the system is quiet when there is no cd. T
nt
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