[James Tanner]

Sorry James my error.He has his Maggies Bi Amped.

OK - no problem there.

james

[VOLKS]

Thanks James..........i always seem to get the 2 mixed up "Word Wise" for some reason .....even though they are totally different.

[SoundGame]

Hi Tim,

Yes the clipping indicators monitor both the instantaneous voltage and current draw and will flash RED if the load attempts to draw more than the amplifier can supply The occassional RED flicker is not an issue but if it is pulsing RED with every beat you will be destroying your speakers.

james

I've seen some speaker power handling ratings that state the RMS with a footnote saying that it is with an amplifier clipping no more than 10% of the time.
 
When the red lights begin to flash - I've never seen mine do this - at what point do Bryston's shut down?  Is it only thermally driven or would clipping more than 10% of the time result in a shut-down typically?
 
I'm just interested if I end up using less efficient speakers and get over-zealous with the volume control.

[James Tanner]

I've seen some speaker power handling ratings that state the RMS with a footnote saying that it is with an amplifier clipping no more than 10% of the time.
 
When the red lights begin to flash - I've never seen mine do this - at what point do Bryston's shut down?  Is it only thermally driven or would clipping more than 10% of the time result in a shut-down typically?
 
I'm just interested if I end up using less efficient speakers and get over-zealous with the volume control.

You would destroy your speakers long before the amplifier heated up enough to shut down.

james

[SoundGame]

You would destroy your speakers long before the amplifier heated up enough to shut down.

james

Message heard loud and clear - this is not a reasonable option. 
 
FLASHING RED LIGHTS ON BRYSTON AMPS = BAD - VERY BAD
 
Thanks!

[mv038856]

When the red lights begin to flash - I've never seen mine do this - at what point do Bryston's shut down

I had the LEDs flashing red on a 3B (before the NRB/ST, with the flat front) some time ago. I had the Sonus Faber Minima FM2 connected to the amp. The Minima FM2, although being a small speaker with an 11cm (4 inch!!!) woofer and a Dynaudio silk dome tweeter, has a very low efficiency. The 3B was clipping although there was a MBL subwoofer between the pre and the 3B, taking off the real deep bass (<80Hz). If I remember correctly, I was trying how far I could go... The amp and speaker passed the test. The 3B never did shut down though! 

I had a 9B ST shut down one channel once. But it was my fault, since there was not enough room above the amp, as it was a rather tight fit in the shelf back then (appr. 1/2 inch of room above the amp...).

Now my amps have grown (6B & 14B SST), have lots of room to dissipate heat and I currently live in a rented flat... so there is more headroom, better cooling and less opportunity to drive the equipment anywhere close to its limits... no flashing, no shut down. 

Cheers!

Markus

[HsvHeelFan]

I've listened to my Bryston 4B-ST for many hours and I've never even seen my LEDS change. They're always green.

I listen at fairly high output levels.  I do have a Velodyne sub that's handling everything below 80 hz and Kef's to handle the rest.  The Kef's are 6 ohm.

My Bryston is in the bottom of an oak cabinet.  When running the door is open and the Bryston is sitting up on 1 inch blocks, so there is space underneath the amp and  I've got about 10 inches of clearance on top. 

Max heatsink temp is around 120 degrees Farenheit after a 5 or 6 hour session.

HsvHeelFan

[JBLMVBC]

Hence the need for efficient drivers...
In fact all this discussion points out to how dynamics are rarely reproduced in so called high fidelity systems: fidelity to what?

[amblin]

Hence the need for efficient drivers...
In fact all this discussion points out to how dynamics are rarely reproduced in so called high fidelity systems: fidelity to what?

BANK BALANCE.   

It hurts, but still, there's so much fun to be had.

[HsvHeelFan]

The Kef Q70's are sensitivity spec is

90dB, 2.83v at 1m

http://www.kef.com/history/en/1990_1/q_series/q70.asp

They are indeed 6 ohm.

HsvHeelFan

[won ton on]

question for James or anyone else who might know. last week there was a power dip over nite. the next day while playing some tunes everything worked but there was no sound.seems it must have put my bp-26 into mute.is that normal?     thanks

[James Tanner]

question for James or anyone else who might know. last week there was a power dip over nite. the next day while playing some tunes everything worked but there was no sound.seems it must have put my bp-26 into mute.is that normal?     thanks

Yes if the voltage drops to low the Preamp will mute.

james

[tim92gts]

Hi The occassional RED flicker is not an issue but if it is pulsing RED with every beat you will be destroying your speakers.

james

Thanks James,
i promise to be careful in the future!
i guess it's showing that the speakers are well matched to the amps, it's a beautiful noise.
Tim

[larevoj]

Guys, these are all very good information to have or aware of.

I have use my 4BSST2 to run-in several pairs of speakers and as well as my recent purchase of Guarneri Evolution. Each time I would slowly push the volume to the maximum where its unbearably loud in the room.

I have never witness the red light and there are times I would just left it play the entire day at the same level to run it in so I won't know if the red light did appear. My speaker is still playing beautiful tunes after 200 hours of run-in that would also meant the 4BSST2 has never clipped.

Performance with Confidence 

[SoundGame]

Guys, these are all very good information to have or aware of.

I have use my 4BSST2 to run-in several pairs of speakers and as well as my recent purchase of Guarneri Evolution. Each time I would slowly push the volume to the maximum where its unbearably loud in the room.

I have never witness the red light and there are times I would just left it play the entire day at the same level to run it in so I won't know if the red light did appear. My speaker is still playing beautiful tunes after 200 hours of run-in that would also meant the 4BSST2 has never clipped.

Performance with Confidence 

If you were running it at very high levels without being in the room and your source material varied in terms of it's recorded level - some recording are louder then others.  Your 4BSST2 may have been clipping in the room without you knowing it - but since you've got a number of hours on the speakers and the sound is "improving" rather than degrading, if it clipped it may have just been instantaneous - therefore, most likely no damage.
 
That said - I wouldn't leave expensive speakers in a room driven at very high levels without being sure my recording level was stable and therefore no chance of driving the amplifier to clipping.
 
Cheers.

[tim92gts]

That said - I wouldn't leave expensive speakers in a room driven at very high levels without being sure my recording level was stable and therefore no chance of driving the amplifier to clipping.


I'd agree, with a decent system and material it might not sound desperately loud.
When i put on some well produced dance music you can just about have a conversation in the room
but everything rattles in the bathroom at the other end of the house. There's a lot of energy being turned into sound.

[larevoj]

That said - I wouldn't leave expensive speakers in a room driven at very high levels without being sure my recording level was stable and therefore no chance of driving the amplifier to clipping.
 
Cheers.

Absolutely agree with that...however, its in a controlled environment since its repeating the same tracks which I am familiar with. 

[SoundGame]

Absolutely agree with that...however, its in a controlled environment since its repeating the same tracks which I am familiar with. 

I'm sure everything is okay - and your ears would let you know if that was not the case - all the best.  And, if I didn't say it directly to you before - your SF speaks are to die for.

[larevoj]

I'm sure everything is okay - and your ears would let you know if that was not the case - all the best.  And, if I didn't say it directly to you before - your SF speaks are to die for.

Thanks...I am very happy with the match of 4BSST2 and Guarneri Evolution.