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The Vistas can take (and love) a substantial amount of clean power. edwinr is correct about the impedance swings of these speakers. The weal link on power handling (given impedance swing) is the low section....the Vistas 8 inch woofer can be overdriven with substantial low frequency content...

I am running a HK 7550HD in a pre-pro front config with a Emotiva XPA-2 for the LR channels driving Vistas...the predecessor to the Theos. the HK drives the rear and center but my focus is mainly 2 channel. I can speak to the XPA-2 dealing with the 4 ohm load of the Vistas. I have no problem...

I am using an XPA-2 to drive my Vistas and it work well and sounds great. The Vistas like a lot of juice and without a powered bottom end the more quality current you can throw their way the better they will sound.