Hi,
I'm the one who suggested the X350 to you on AA. I own the X350 and a pair of X600's in my 7.1 setup. The plinius is a very nice sounding amp and I don't think you will feel cheated. I agree that the plinius is on the warmer side. The Pass is more neutral,has more power and represents a better value on the used market. Their customer service is second to none. Do a search. They are a great group of people.