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  #1  
Old 02-15-2021, 03:41 PM
AVfile AVfile is offline
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Join Date: Jan 2021
Posts: 25
Default Noise on 7B2

Iíve seen a lot of nice stories on Facebook lately of people getting their older 3B and 4B amps tuned up by the factory. My 7BSST2 are only 9 years old but there has always been some buzzing noise audible if you stand close to the tweeter/mid. Knowing that big amps can do this it does not really bother me, but it is different than the usual hiss (white noise). So I decided to measure the output at the speaker terminals.

Amp 1:
0.4 mV AVG
Min -2.5 mV
Max +2.5 mV

Amp 2:
-7.4 mV AVG
Min -11.5 mV
Max -3.6 mV

I donít think this is anywhere near the specified -117 dB SNR which should be less than 0.1 mV by my calculations. Also looks like Amp 2 has a significant DC offset. What have others found?

Can Bryston fix this?
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  #2  
Old 02-16-2021, 11:54 AM
hdvidguy hdvidguy is offline
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Join Date: Jan 2016
Location: Ontario
Posts: 151
Default

Quote:
Originally Posted by AVfile View Post
Iíve seen a lot of nice stories on Facebook lately of people getting their older 3B and 4B amps tuned up by the factory. My 7BSST2 are only 9 years old but there has always been some buzzing noise audible if you stand close to the tweeter/mid. Knowing that big amps can do this it does not really bother me, but it is different than the usual hiss (white noise). So I decided to measure the output at the speaker terminals.

Amp 1:
0.4 mV AVG
Min -2.5 mV
Max +2.5 mV

Amp 2:
-7.4 mV AVG
Min -11.5 mV
Max -3.6 mV

I donít think this is anywhere near the specified -117 dB SNR which should be less than 0.1 mV by my calculations. Also looks like Amp 2 has a significant DC offset. What have others found?

Can Bryston fix this?
Sure they can. Send in for warranty. Most likely a bad capacitor(s). I had my 14B SST with one channel bad. They replaced a bunch of things and got it back to factory specs.
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Bryston SP3, BDP 2, 14B SST, 6B SST, 4B SST B&W 802N, HTM1, AM1x4, Paradigm SUB 2
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  #3  
Old 02-19-2021, 06:53 PM
AVfile AVfile is offline
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Join Date: Jan 2021
Posts: 25
Default

Quote:
Originally Posted by hdvidguy View Post
Sure they can. Send in for warranty. Most likely a bad capacitor(s). I had my 14B SST with one channel bad. They replaced a bunch of things and got it back to factory specs.

OK thanks. I called Bryston and was told to email Mike because he is working from home so now Iím just waiting for his reply.
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  #4  
Old 02-20-2021, 01:42 PM
hdvidguy hdvidguy is offline
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Join Date: Jan 2016
Location: Ontario
Posts: 151
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Originally Posted by AVfile View Post
OK thanks. I called Bryston and was told to email Mike because he is working from home so now Iím just waiting for his reply.
Where Bryston is located in Ontario, we just came out of full lock down due to COVID. Stereo stuff is non essential. So may be some long delays getting things fixed.
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Bryston SP3, BDP 2, 14B SST, 6B SST, 4B SST B&W 802N, HTM1, AM1x4, Paradigm SUB 2
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