Intrestingly, I find my Krell sounds better at low volumes especially in the bass regions. I concluded that this is due to one or both of two things. First the Krell has a kind of what some term as a forward sound or dynamics. Therefore it kind of makes the music stand out at lower volumes compared to other amps. Secondly I think my low-efficiency Aerials (85 dB) may just be more than the 400Xi can drive at high volumes. I know it's a 200 watt amp but it seems lose some of it's clarity at higher volumes. This may be the room dynamics too - some cancellation going on. Still at low volumes the instrument separation is just amazing. I've heard the same speakers driven by high-powered Thetas and frankly it seems like the Aerials need a large amount of power if you want to really throw them around. regards, David
