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Bryston 4B green clipping lights blinking

Hi,

Although not new to Audiogon (the site), I'm a newbie to both posting on the Forum and to equipment outside that created for the masses. 

That said, I'm looking to achieve better sound in the house and recently purchased an older rebuilt Bryston 4B amp, an upgraded Apt Holman Preamp (from the Audiogon classifieds), Mirage M1 si speakers, a Marantz TT-15 turntable and various semi expensive interconnects and speaker cable. I have this system set up in a room that measures 18 feet by 38 feet.

While the system sounds as good as I had hoped (even under extremely loud settings), the amp LEDs continuously blink green when under even the slightest load. This is true even when inputting digital music via a Bluetooth module. Further, I'm using a higher end power conditioner on everything but the amp (I understand Bryston recommends a direct connection) and a stand alone 15 amp circuit with a proper ground. I wrote the seller and he tells me that older 4Bs do this.

Can anyone tell me if this is an ok condition?

thanks,

Rick







rickdarling

Showing 1 response by georgehifi

georgehifi's avatar
georgehifi
10,312 posts
 

If you find there is nothing wrong with the amp, it could be pre clip warning. 

The Mirage M1’ are a great speaker and this 4B should be fine, the M1’s do have a nasty 5ohm combined with -45 phase angle at 60hz but the 4b should handle this.

http://www.stereophile.com/content/mirage-m-1si-loudspeaker-measurements#PGAwhPPKQTyDfY5g.97

The Bryston is dc coupled, I think maybe you could be getting warp frequencies or subsonic rumble arm resonance coming through from your t/t phono stage setup, I don’t know what bass mode means on the Holman pre, but it looks like it maybe a rumble filter, see if that cures it.

If that’s no good, then try cd player and a different preamp see if it cures it.


Cheers George

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