In most cases I would use one at the input of the preamp though instead of the input to the amp
Yeah, I'd have to agree with that, Herman. Makes it more complicated for me, though. First I'd have to build or buy multiple pairs. And second, my main source (D/A converter) runs to my pre over balanced ICs.
Maybe I should just send my pre back to Pass to have them mod it. The cost to get all those external attenuators would probably be about as much as just having the internals adjusted.