I own a Ref5se. I used a Bryston 14bst then traded it for a Ref 75se. While I appreciated the tube sound over the Bryston, it wasn’t long before missed the extra headroom and I traded it in for a GS150 with my 86db Revel Salons. No problems now. Definitely move up from the Ref75 with your room and speakers, as stated previously.
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