I had a pair of nautilus 802 which I replaced with the 802 diamonds and I played both very loud (ie I can't hear what the person beside me is saying). I think the 802's don't sound their best unless they are played at higher volume. Hi-fi+ had a review of the 802 diamond which said the design team assessed the 802 at very high sound levels. That being said my cousin has a 800n speaker, which he blew the midrange driver. In his case ,he had by passed the cross over and powered the 800n with 3 amps and an active cross over.