Is a 600 ohm preamp output impedance to high for 28BSST2's ? ...

[joeinid]

Hi James,

Any thoughts? Audio Research preamps are typically 600 ohms. My GAT is <100 ohms and works wonderfully but is single ended.

Thanks!

 

[cmalak]

What's the input impedance on the Bryston amps?

 

[DaveC]

Input impedance is a bit low at 15k but it shouldn't have any issues. 600 ohm output from a tube pre is probably a cathode follower output so it should have plenty of current, no problem driving the Bryston.

 

[joeinid]

What's the input impedance on the Bryston amps?

In the manual it is listed at

INPUT IMPEDANCE		15K		Ohms	balanced.input.(XLR)

[TD="bgcolor: rgb(0.000000%, 0.000000%, 0.000000%), colspan: 6"] [/TD]

[TD="bgcolor: rgb(0.000000%, 0.000000%, 0.000000%)"] [/TD]
[TD="bgcolor: rgb(0.000000%, 0.000000%, 0.000000%)"] [/TD]
[TD="bgcolor: rgb(0.000000%, 0.000000%, 0.000000%)"] [/TD]
[TD="bgcolor: rgb(0.000000%, 0.000000%, 0.000000%)"] [/TD]
[TD="bgcolor: rgb(0.000000%, 0.000000%, 0.000000%)"] [/TD]
[TD="bgcolor: rgb(0.000000%, 0.000000%, 0.000000%)"] [/TD]

But I think it might drop a little lower is reality.

 

[James Tanner - Bryston]

15K each leg on the Balanced and 50K on the RCA single ended. You want at least a 10 to 1 ratio between preamp output impedance and amplifier input impedance,

james