[ctviggen]

of my two amps is different?  One is 600mV (tube amp, used for highs/mids), and the other is 1V (one channel of Bryston 9B, used for bass).  Is there a passive device I can use on the Bryston to reduce its output?  (I don't want to go active, as this is only for my center channel, and I'll be experimenting with tubes.)  Thanks.

[JoshK]

Shunt a bit of the voltage going into the tube amp by using a pot on its input.  Shunt configuration would be a good idea on this for minimum sonic penalty (ie one resistor in series, pot in shunt to ground). 

[BobM]

Get one of these and put it on the inputs of the Bryston:

http://cls.audiogon.com/cgi-bin/cls.pl?preatran&1170475003

I did something very similar with my McCormack. The one downside is that I now feel compelled to tweak and play with this damn thing, warming it up or leaning it out, depending on the recording or the source (LP vs CD).  Actually it's not that bad, I've found settings that work best in most cases for each.

Enjoy,
Bob