Threshold SA3 buzz / hum in speakers

Tino · 10th February 2008, 01:32 AM

Hi guys. I have an amp that will give off a bit of hum and buzz through the speakers regardless if there is a source connected to it or not. I have no special equipment except for a multimeter.

I measured the following at the loudspeaker terminals with no source.

LC - 0.06V AC, 0.18V DC
RC - 0.06V AC, 0.06V DC

The left channel does have roughly twice the audible buzzing and humming compared to the right. I took the amp to the shop and they said all checks out ok. I thought it might be some interference from something in the house so I powered off all other equipment or lights that I could think of but no change.

Is it possible that this is caused by some DC on my AC power line? I stuck my multimeter in the outlet and measured 116V AC but I also measured 17.4V DC. I'm guessing this should not be there.

Any suggestions welcome.

Tino · 10th February 2008, 06:24 AM

Correction on the values. I misread the numbers. Its as follows:

LC - 0.06V AC, 0.018V DC
RC - 0.06V AC, 0.006V DC

10th February 2008, 01:32 AM	#1
Tino diyAudio Member Join Date: Jan 2004 Location: Toronto	Threshold SA3 buzz / hum in speakers Hi guys. I have an amp that will give off a bit of hum and buzz through the speakers regardless if there is a source connected to it or not. I have no special equipment except for a multimeter. I measured the following at the loudspeaker terminals with no source. LC - 0.06V AC, 0.18V DC RC - 0.06V AC, 0.06V DC The left channel does have roughly twice the audible buzzing and humming compared to the right. I took the amp to the shop and they said all checks out ok. I thought it might be some interference from something in the house so I powered off all other equipment or lights that I could think of but no change. Is it possible that this is caused by some DC on my AC power line? I stuck my multimeter in the outlet and measured 116V AC but I also measured 17.4V DC. I'm guessing this should not be there. Any suggestions welcome.

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10th February 2008, 06:24 AM	#2
Tino diyAudio Member Join Date: Jan 2004 Location: Toronto	Correction on the values. I misread the numbers. Its as follows: LC - 0.06V AC, 0.018V DC RC - 0.06V AC, 0.006V DC

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