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I have a weird buzz issue; can you help me solve the problem?

Hi - my integrated amp has a 25db persistent buzzing noise; I need help figuring out how to solve this problem.

Here’s my system:
CODA CSiB integrated amp - custom tuned to produce 25w Class A power before switching to Class B
Lumin T2 streamer/DAC
Dynaudio Focus 380 speakers
Audience AR2-T2 power conditioner w/Audience power cable
Audience AU24 speaker cable
Cardas Clear M power cable
Purist Venustas Luminist Revision RCA interconnect
Synergistic Research TeslaPlex SE outlet
Shunyata Venom Defender

Some background:
I’ve had the CODA integrated for about 5 years. The remainder of my system has come on-line subsequently (I had different speakers initially). Within a few months of purchase, I noticed a buzzing noise coming from the speakers whenever the amp was powered on (bias “on”), but no noise in standby mode (bias off). I took it back to the manufacturer, who plugged the amp into their dedicated circuit and it was dead quiet. I had the same experience taking it to a local audio shop. Thinking that it might be a noisy circuit, the local shop loaned me a lesser priced solid-state amp (I forget which brand) to bring home. I hooked up the shop’s integrated to my system and.....it was dead quiet. Now I was confused. 

A dealer loaned me a completely different system with a tubed integrated, different speakers and cables. There was even a worse buzz coming from this system than from mine. I went back to living with my system and forgetting about the buzz.

Fast forward 4+ years. I have moved to a new house in a new state. Unfortunately, the buzz remains :-( I even tried plugging the system into what the electrician was sure was one dedicated line in the house (it was in the kitchen, so I had to run an extension cord to where my audio system lived). Still, the buzz remains.

I really love the sound of my system, but this persistent buzz is a (ahem) buzz kill (sorry for the predictable and bad pun). 

I would love to get some thoughts on what I can do to get rid of this damn noise. Please help!



mwsl
oldhvymec
5,101 posts
 
Again, you took it to a repair man, they hooked it up, and there was NO NOISE. You brought home a whole different system, WITH speakers.
The noise was even louder. 

Shorting plugs, la - te - da. IT WENT AWAY.....It was gone... It was fixed.
at the repairmans, WHAT did they do?

You moved, you still have the noise...

You have the answer. Think!! 

The repairman, do you know if they simply had NO ground hooked up? NO.

Get the cheater plugs. 1.00 dollar each. Get more than one. Use them on every plug for a test, ONLY.
If it goes away, you have a difference in voltage between the unit and a component.
Remove the cheater plugs, all of them.
Take a jumper, and hook between components.
You can not have to many, BUT you might not have enough of them. Hook them to EVERYTHING, between all components, until the noise goes away. Once you've isolated the noise. Make or buy a ground wire, clean to bare metal, on both ends. Check to make sure the grounds are common. Check!!!

If the noise is still there after the checks, it is a routing issue as I said..

Does the noise Yo Yo.. If you move cables, does the noise go up and down. Be aggressive moving the cables, not rough, but move them more than an inch, move them a foot 12" not 1/2". Then you've checked..
No Check No fix.. Or a Train ticket, I'll come and fix it for you.. My fingers are getting tired...

Regards
Post removed 
mijostyn's avatar
mijostyn
8,570 posts
 
Very interesting and strange. It would appear from what I have read that you have covered all the bases except one. The speakers. Please try another pair of speakers disconnecting the ones you have and let us know what happens. I have seen this with powered speakers but not passive ones. Stranger things have happened. 

I feel for you, Sh-t like this drives me crazy. In my own little world everything has to be perfect. No buzzes, no dents, no imperfections.
It's like having a splinter in your hand. When the splinter comes out there is this sense of relief that one gets that is inherent in all of us.

Good luck,
Mike
mwsl OP
64 posts
 
Ground cheater installed. No effect. Buzz still exists. 

To Jea48: definitely the buzz, not a hum. 

Should I now order and try input shorting plugs? If so, can someone send me a link for viable ones that are inexpensive? Will I need them for both RCA and balanced inputs?

Thanks again to all - this IS very frustrating. I so like the overall sound of my system, but this has been a persistent problem that I would really like to get solved. 
imhififan's avatar
imhififan
2,232 posts
 
I have a CODA CSiB v3 integrated plugged directly to the wall, without any shorting plug installed, no buzz, hum or any kind of noise while bias “ON” at any selected input.

I think the last thing you can try is to turn off all circuit breaker except the one for your amp, unplug everything from that circuit. power up the amp and see if the buzz still exist, if yes then the amp need to send for repair, if no buzz then you can plug back all electrical device one by one and see if buzz exist. If no buzz then turn on all circuit breakers one by one until buzz exists again so you will know what caused the issue.


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