What I want to do is use a 5 channel amp to power my mains, center and sub. Use a 40wx2 Jolida tube amp to biamp the mids and highs on my mains. The Jolida has adjustable gain control, but the sherbourn does. Would the sherbourn and jolida match each others output gain? I'm afraid that the sherbourn will not match the jolida or vice versa. Seems like most integrated amps have gain control. What are some $1000 and under integrated amp that is 200wx5 and bridgable?