My friend has a pair of the monitor 11's and they are the reason I got my 90P's. I thought they lacked bass, but from what it sounds like, he needs some real power to get the potential out of them. I love my 90P's...I was somewhat dissapointed though, before I upgraded my reciever and amplifier. Even though they are powered themselves, they love the extra power and it seems to help the bass dramatically.