I have a pair of the EP500 and could not be happier. With the two of them on with some content you can get the whole room shaking. I was told when I ordered them that the pair will help give you a bit lower frequency as the two will have an additive effect. I have not heard an EP800 so i don't have a reference to what it sounds like. I know for myself listening to clastical music with the warnings on the CD that playing too loud can blow your speakers, I have never

1. had a problem with blowing the EP500. it takes whatever I throw at it.
2. feeling disappointed that I am not getting the sound that I deserve.
3. wished that I had bought a larger unit.

Anthem: AVM60, Fosi DAC-Q5
Axiom: ADA1500, LFR1100 Actiive, QS8, EP500, M3, M3comp, M5