Popping and Buzz problem, with a Twist

Ron Duca

Stunt Coordinator
Joined
Dec 29, 1999
Messages
76
I've read many threads concerning popping, buzzing and hissing sounds introduced into systems with the addition of an amplifier. I regret to say that I have joined that club.

I just added the Sherbourn 5/1500A amplifier to my system and am now using my Yamaha RX-V995 as a pre/pro. I connected the amp to the receiver using unbalanced interconnects from Markertek.com (Canare GS-6 cable). I powered the amplifer up and all was well. I then powered up the receiver, and after the Yamaha finished its little safety check and sent a signal to the amp, there was pop in all five speakers. This was accompanied by an annoying buzzing sound. After a few minutes the buzzing diminished to a tolerable level.

The amplifier has a sleep mode that it goes into after five minutes of not receiving a signal, so I leave it powered on. This morning I went into the living room, where the system is, and when I flipped the light switch in the room it woke up the amplifier, which caused the speakers to pop. Also, I discovered that turning on light switches that have built-in dimmer switches creates an even louder buzz.

The house is less than one year old. I would love to hear that I could resolve the popping and especially the buzzing with the addition of a non-current limiting power conditioner or something. Re-wiring the house is out of the question, although adding a dedicated line and outlet for the audio/video equipment could be a possibility if I could be guaranteed that would solve the problem.

Other than the usual approach of unplugging and re-plugging all components in my system, does anyone have any suggestions that might address this electrical interference issue?

Thanks,

Ron Duca
 

Mike Matheson

Second Unit
Joined
Jul 15, 2000
Messages
416
Ron,

The buzzing/popping caused by devices (such as lights) on the same circuit should be greatly reduced to entirely eliminated by the addition of a dedicated circuit--this is one of the primary reasons for doing such. I did it myself, and it worked.

The popping (not hissing) when you turn on your receiver is not uncommon, given your amp is already powered-up. One solution is to simply leave the amp off, and turn it on AFTER turning on the receiver (and after giving the receiver time to get through it's wake-up/diagnostics). You may be able to find devices that will power-up your amp automatically (including a delay) once power is sensed flowing to your receiver.

The initial hissing when the receiver is turned on may be due to its components warming up, storing energy, stabilizing, etc. I know my amps buzz (literally, the amp itself, not the speakers) for a few moments when they power up--which indicates to me that there are things getting "settled in" as the amp wakes up and warms up.

My $.02.
 

JackS

Supporting Actor
Joined
Jan 17, 2002
Messages
634
Concerning the amp buzz. It's my experience that this is common with many amps, and can be considered normal as long as the buzz is inaudible while enjoying music or a movie. Also adding an amp to a setup with an existing amp doesn't add any volumn to the buzz. The popping sound you hear, as I understand it ,is common when connecting an amp to a receiver. The advise given to power up receiver and source before the amp should solve this problem. Good Luck Jack
 

Ron Duca

Stunt Coordinator
Joined
Dec 29, 1999
Messages
76
Update: I haven't quite figured out the popping problem yet, but I found the source for the buzzing and hissing noise coming from all speakers. It is definitely a ground problem. I put a cheater plug on the amplifier's power cord and it eliminated all buzzing and static, including that which had been caused by using a dimmer switch on a light in the same room. I talked to an electrician about this situation and have decided to have him come out and install a dedicated circuit for my AV system.

Thanks for the advice. Now, back to the "popping" testing.

Ron
 

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