Welcome to the board Dash!

You'll be perfectly fine running the 80s with the HK 645, I've ran our 80s with the H/K 635 we have and haven't had the slightest issue with the receiver...I've even had a couple of centers (VP100 & 150) wired in parallel for an impedance rating of 3.4 ohms and again didn't have any issues whatsoever with the 635.

Depending on your room size, have you considered the EP500 over the EP350?


Rick
Our Room

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