Bi-amping a MC275 with my MC452.

Opinions, been wanting to purchase a MC275vl to bi-amp with my MC452. Has anyone tried this or something similar. Would keep the 452 for bass and the 275 for the mids and tweeters. I have read an old post that 275s don't match up well with horned speakers. I have Cornwall ivs. Has anyone found this to be  true                      Also Mcintosh rep.told me I would need another unit to control volume for both amps. If true what alternates  can I use. The Mc. version is 5k which is not in my budget at this time. Thanks for your help