Sorry to say but I do'nt believe you can bridge those amps and still drive a 4 ohm load.Doing so the amps would see the load as a 2 ohm load not 4.If it were M60's it would work seeing they are 8ohm and then bridged the amps would be seeing them as a 4 ohm load.I too would bi amp not bridge.

Rick


"A fear of weapons is a sign of retarded sexual and emotional maturity." Sigmund Freud