Power Requirements for Multiple Bryston Amps

danconio · « **on:** 20 Jan 2006, 07:23 am »

I have 3 Bryston 7B ST amps and 2 7B NRB amps. My question is can I power all of these on one 20A ckt or should I put 2 on one 20A ckt and 3 on the other?

Also if I am rack mounting the amps is 2 rack spaces enough between the amps in a rack?

Jason Nugent · « **Reply #1 on:** 20 Jan 2006, 02:46 pm »

A 7B amp has the potential to draw 1980 watts when pushing 900w into a 4 ohm load. I'm not an engineer, but it sounds like you'd want to put each amp on its own circuit (1980 VA / 120V = 16.5 A). A friend of mine has a pair of 7B ST monoblocks and has each amp on its own 20A circuit. I have a 4B and a 9B and each amp is going on its own 15A circuit.

Definitely, I think you'll have problems if you try to put all the amps on a single 20A circuit.

danconio · « **Reply #2 on:** 20 Jan 2006, 03:23 pm »

Thanks Jason I see that I need to run a few more circuits into the theater than I was planning.

James Tanner · « **Reply #3 on:** 21 Jan 2006, 12:49 pm »

Hi All,

Remember that the maximum amperage draw is at FULL power into very low impedances. I generally find one 15 amp circuit per Pair of 7B's or one 14B works very well under real-world conditions.

james

eddiem67 · « **Reply #4 on:** 22 Jan 2006, 06:52 am »

you can always pick up a Torus

James Tanner · « **Reply #5 on:** 22 Jan 2006, 12:42 pm »

Quote from: eddiem67

you can always pick up a Torus

That's true.

I just installed a 240 volt/60Hz line in my theater room this week and I am using the 60 amp version of the Torus as we speak.

james

danconio · « **Reply #6 on:** 22 Jan 2006, 05:53 pm »

I would be very interested in your impressions of the difference the Tours made in the sound

James Tanner · « **Reply #7 on:** 23 Jan 2006, 02:37 am »

Quote from: danconio

I would be very interested in your impressions of the difference the Tours made in the sound

OK give me a few days to live with it and I will report back.

james