This is the guy who has his 40.2's in a small room.
https://www.whatsbestforum.com/threads/benchmark-ahb2-amplifier.25366/
He's using bridged Benchmarks. 380W should do the trick!
https://www.whatsbestforum.com/threads/benchmark-ahb2-amplifier.25366/
He's using bridged Benchmarks. 380W should do the trick!