GoodSoundClub - Romy the Cat's Audio Site

In the Forum: Audio Discussions
In the Thread: It’s mad, mad, mad... electricity.

Post Subject: You are confused.Posted by Romy the Cat on: 2/3/2013

SOS wrote:
I fully disclosed to the new owner what issues I had only with analog, which he also uses. Well he received it late last week and he also has the buzzing sound with analog! The is confident he can solve the issue and I wish him all the luck but now this is the 4th person with a 2000+ unit that has the same issue. I truly believe it is now in the design of these new + units because the original units did not have this problem, either at my place when Romy brought one over or at another guys place (not my customer) who has the original non plus PP 2000 unit and all is great but when his dealer lent him a + unit the buzzing started and he could not solve the issue. If this issue was ONLY my issue I'd tell all it was my system and ignorance that was at fault but with 4 systems with the same issue.......well you decide or can speculate what the issue is.Again I wish PP can figure this all out b/c it is a wonderful unit and will do very well in the market but at the moment not as is.

SOS, now you describe your problem as “buzzing sound with analog”. That was exactly my point – a certain lack of focus on YOUR part. The group loop hum and buzzing are very different issues. In addition you might not experience buzzingfrom speakers but mechanical buzzing from your components that you mistakably take as speakers buzzing. Again, the lack of exactness of you complains is an indication to me that you are not sure what you are complaining about. If you have buzzing then it is most likely a mechanical buzzing of your units magnetiks and it has nothing to do with ground loop or with listing grounds. That would also explain why you and other have it only with analog. Digital PS are usually cheaply bile with RC filtration but analog frequently have RLC or LRC filtration where transformers and chokes are more prone to buzz if PP sends too much DC in output. I know that in old PP they have a manual adjustment of DC present and if I am not mistaken the new unit it has automated DC compensator. IT is possible that this DC compensating circuit is malfunctions and this would be consistent with what you report. To fix it would take no efforts and it is very simple, however if your presumably malfunctioning DC unit goes to PP plant then they not necessary can catch it as in their tests, against their loads the same unit might not send DC(it is load specific). I know that they have no high current input choked PS to teats PP as I had the problem to drive it and they were not able to replicate it. So, if you do have buzzing then the very first think you need to do it to figure out if it is acoustic or mechanical and inform them that it is DC problem. Buzzing and hum are VERY different problem and you can’t confuse them.

The Cat

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