I should be getting my M22s tomorrow. I'll be running them with an HK 525 and I listen to everything from classic rock (Crosby, Stills, Nash) to metal (Metallica - especially older albums). I'm going to really test them with Metallica's "Blackened" off of "And Justice For All". It has one of the quickest upper bass segments going to the chorus and should really allow the M22s to shine.

Frank