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The phenomenon of amplifier is buzzing
The phenomenon of amplifier is buzzing
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Old 1st August 2020, 02:01 PM   #11
xrk971 is online now xrk971  United States
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The phenomenon of amplifier is buzzing
I think this may be a language / semantics thing. I assume buzzing (from speakers) may be what is normally called “hum” from the mains. Hum from mains might be due to PSU caps or bad rectifiers - but as the caps were replaced, it may be from a ground loop or inadvertently contacting signal ground to chassis ground somewhere. A few more closeup photos at oblique angles rather than straight rectilinear may show us more detail to help debug.

It is not clear that the aluminum chassis has a connection to earth/mains ground. Try grounding the chassis and see if it helps. Maybe use a 10ohm resistor ground loop breaker.
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Last edited by xrk971; 1st August 2020 at 02:04 PM.
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Old 1st August 2020, 03:03 PM   #12
multisync is offline multisync  Canada
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Mooly has provided a link which gives the amplifier specs. The line level input SN ratio is only 63db. The buzzing if its a low level might be normal. Is the buzzing noise the same on all inputs? You mentioned the buzzing gets louder as you turn up the volume. Check the shielded cable ground connections.
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Old 2nd August 2020, 11:38 AM   #13
phungdiep is offline phungdiep
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I check the ground connection of everything is fine, I found the "hum" in the Loudness floor of amplifier, when I turned down the Loudness button, the phenomenon no longer exists.
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Old 2nd August 2020, 12:00 PM   #14
phungdiep is offline phungdiep
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Quote:
Originally Posted by multisync View Post
Mooly has provided a link which gives the amplifier specs. The line level input SN ratio is only 63db. The buzzing if its a low level might be normal. Is the buzzing noise the same on all inputs? You mentioned the buzzing gets louder as you turn up the volume. Check the shielded cable ground connections.
"hum" sounds when not connected to input devices. I broadcast the loudness floor got "hum"
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Old 2nd August 2020, 01:20 PM   #15
OldDIY is offline OldDIY
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There may be poor shielding or improper grounding of the volume control.
A buzz can be generated by a fluorescent or LED lamp.
Self-excitation of the amplifier cannot be ruled out.
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