@OP Buzzing has three principal causes - mains or signal grounding issues, electromagnetic interference, or component failure. If you have absolutely eliminated the first two then the first place to look is the power supply in the amp. Regrettably, if you are not a technician yourself, you probably have no option but to enlist the help of one. If the amp is out of warranty, any decent tech should be able to fault find it. Power amps are among the simpler components in hi fi. I know you say you have moved things around, but if you haven't done it, I would physically move the right hand amp and all of its cables over to the location of the left hand amp. EMI can be weird. It's a very long shot but worth checking. However, I still agree with your surmise that it's the amp that has a problem. But you never know.
Help With Buzzing Sound
I run a pair of Hegel H30 SS amps in the mono block configuration. Just recently, there is a noticeable buzzing sound emanating from my left speaker when the amps are just idling. I know it's the amp as I've moved things around and the problem follows the amp. It is there both in mono mode, and in the left speaker only when I've switched it to stereo mode. Looking for suggestions as to what the most likely culprit may be. Also trying to avoid shipping a 100 pound amp across the country to the authorized service center. All help is greatly appreciated. Cheers.
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@bigtwin , Seriously, ask ChatGPT. It will give you a complete rundown of probable causes, and solutions to each cause. As you narrow it down, it will give you an increasingly in depth solution to your problem. That AI business is really something. |
A look inside of the Hegel H30 SS Any internet routers or such on the left channel side of the Amp?
Do you have any RCA shorting plugs? For a test totally isolate the amp from everything. Install RCA shorting plugs on the RCA input jacks on the amp. Unplug all other audio equipment from 120Vac power outlets. Everything. Power on the amp and check for the buzzing. Buzzing still there? Does it sound like this? Like this? If it sounds like 120Hz, good chance a left channel power supply rectification/filtering problem. How are you feeding 120Vac power to the amp? A separate dedicated 120V branch circuit? (Dedicated circuit with its own, Hot, neutral, and ground, conductors?) If yes plug the amp into a different branch circuit feed. Check for buzzing. Still a buzzing sound? . |
@thecarpathian I have checked with AI, but find it very unreliable. So often the AI answer is blatantly wrong. Thanks to all who have responded. It would appear the most likely issue is a failing capacitor. Everything else has been eliminated. The sound is there when no signal source is connected, it is not affected be volume when source is connected, and disappears completely when another amp is switched in. I guess I start calling around to see if any local repair facilities will look at it. Cheers. |
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