[1oldguy]

I remember once having an electrical buzz.It went away when I pushed the rca cable in just the smallest amount further.

[vegasdave]

Every single amp is checked as it leaves Bryston for noise and distortion against a strict standard - we can certainly look at the amplifier for SoundGame but I doubt we will find an issue. Bryston amplifiers have higher internal gain than most amps and I am sure that is what is happening and it will act differently in different systems depending on overall gain characteristics within those systems.

james

 

[SoundGame]

I've spoken with another BP6/4B-SST2 owner and they have the same soft "white noise" hiss - detectible only when you get right close to the tweeter - no more then 4" to 6" away.  It seems to be just part of the base noise floor of the system, as James suggested.  No real concern for me, given its level - so I'm going back to enjoying the music. 

[vegasdave]

My Bryston units are absolutely quiet.

[SoundGame]

My Bryston units are absolutely quiet.

Okay - I thought I was about to drop this but it itches me that someone with a similar setup (vegasdave has a 4B-SST with BP6 - while I have the new 4B-SST2 with BP6) gets a different result. 

Vegasdave: Can you please do this for me and/or confirm that you're done this? Turn on your 4B with the BP6 off and put your ear right up to the tweeter of your speaker - aligned directly with the tweeter in an absolute quiet room.  Is there any hiss / white noise you can detect?  Try listening while turning on and then off the amp.  The noise I'm hearing can only be heard when the room is quiet, my ear is aligned with the tweeter and I'm around 4 inches maximum away.  Please confirm. 

Thanks!

[vegasdave]

No hiss. Now with phono, there is some hiss. I take it this is normal?

[SoundGame]

No hiss. Now with phono, there is some hiss. I take it this is normal?

I wouldn't think the phono should bring in the hiss but it could have a lower noise floor and that's what you hear - the difference. 
It's strange that you don't hear any hiss or hum for that matter as I believe you have like a 30+ foot run on IC between your preamp and amp.  That has a large impact on the transmission of the signal regardless of the cable used in a single-ended setup.

[vegasdave]

I wouldn't think the phono should bring in the hiss but it could have a lower noise floor and that's what you hear - the difference. 
It's strange that you don't hear any hiss or hum for that matter as I believe you have like a 30+ foot run on IC between your preamp and amp.  That has a large impact on the transmission of the signal regardless of the cable used in a single-ended setup.

I believe so. Correct, I do have that IC run. No hiss or hum. Honestly!

[SoundGame]

I believe so. Correct, I do have that IC run. No hiss or hum. Honestly!

 
What's the IC you are using between your pre and power?
Do you have a dedicated / isolated circuit for power to the amp?
Are you using original Bryston power cords or an aftermarket - what brand?
What is the efficiency of your speakers?
Could your tweeters be blown?? 

[vegasdave]

Well, the BP6 can drive long cables with no problems. I believe you know this.

ICs are FM Acoustics P.I.T. RCA to XLR

No dedicated circuit.

Original Bryston cords

Efficiency of speakers is 91dB

No, the tweeters are not blown!

[rofo]

"What is the efficiency of your speakers?"

Please do not interchange the term "efficiency" with sensitivity, they are 2 different things. Loudspeakers are very inefficient and is usually expressed as a %. Sensitivity is expressed in dB @ 1 meter from the loudspeaker with 1 watt of energy applied.

"ICs are FM Acoustics P.I.T. RCA to XLR"

check your cables to see if they are properly wired. To unbalance a balanced input pin 2 on the XLR should connect to the centre pin of the RCA connector, pins 1 and 3 on the XLR should connect to the outer shell of the RCA connector (use an ohmmeter for this).

[rofo]

No hiss. Now with phono, there is some hiss. I take it this is normal?

yes this is normal. the preamp is boosting a signal from micro volts to line level it is also applying the RIAA curve. see http://www.stereophile.com/features/cut_and_thrust_riaa_lp_equalization/index.html

[vegasdave]

"What is the efficiency of your speakers?"

Please do not interchange the term "efficiency" with sensitivity, they are 2 different things. Loudspeakers are very inefficient and is usually expressed as a %. Sensitivity is expressed in dB @ 1 meter from the loudspeaker with 1 watt of energy applied.

"ICs are FM Acoustics P.I.T. RCA to XLR"

check your cables to see if they are properly wired. To unbalance a balanced input pin 2 on the XLR should connect to the centre pin of the RCA connector, pins 1 and 3 on the XLR should connect to the outer shell of the RCA connector (use an ohmmeter for this).

I dunno, everything works and sounds ok. Why should I worry?

[vegasdave]

yes this is normal. the preamp is boosting a signal from micro volts to line level it is also applying the RIAA curve. see http://www.stereophile.com/features/cut_and_thrust_riaa_lp_equalization/index.html

Thanks.

[PRELUDE]

http://graffiti.virgin.net/ljmayes.mal/comp/philips.htm

[SoundGame]

http://graffiti.virgin.net/ljmayes.mal/comp/philips.htm

  Are you suggesting James incorporate this into the Bryston amplifier design???