Since "Can only be heard with ear right up to drivers" it is not a "problem."
The solution to the "problem" is simple, don't put your ear up to the driver.
Faint buzz in speakers
There is a very faint buzz coming from speakers with amp on, but with no music stream playing. Can only be heard with ear right up to drivers. No buzz with amp off or muted. Decent amp & cabling. Is this faint buzz likely still there under music when it’s playing? Numerous noise reduction devices deployed including dedicated circuit, robust grounding, balanced power transformer, various filters. Thoughts?
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Level of regulation and filtering in power supplies matters, this in regard to resistance to possible external sources of noise as mentioned above. And the more efficient one's speakers are, the more they may expose noise. For instance, I have 104db efficient speakers, 845 amps noisier than 300B, 845 amps run near 1000V, inherently noisier, require more extensive filtering, regulation than 300B. Quality of power supplies in equipment within any particular tube family can also differ. OP could try another amp to try to determine relative quietness of ps in present amp. |
Here you go:https://upscaleaudio.com/pages/idle-hiss |
Russ69...I'm the OP. Thank you for the link to this article from Upscale. It's the best explanation I've read on the topic! I would urge anyone with a similar perceived problem to read this. Any frustration over chasing down a faint noise coming from my speakers has been happily replaced with many more worry-free hours of musical bliss. Thanks to everyone who've shown an interest in helping me solve this riddle. Happy Holidays! |
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