Many claim that Threshold amps work very well with Audio Research's pre-amps.
I'm not familiar with the Gallo Ref SA. I believe it has RCA inputs. Will you need two pairs of RCA outputs from the pre-amp to connect to both the Threshold and Gallo amps?
I'm not familiar with the Gallo Ref SA. I believe it has RCA inputs. Will you need two pairs of RCA outputs from the pre-amp to connect to both the Threshold and Gallo amps?