Topping LA90D (dual in mono mode) or a used Classé CA-200?

[BrokenOath]

From what you're saying, I would suspect that you're sitting in a null, and that all you need to do is adjust your seating position. Because you have Klipschorns, you don't really have the option of changing the position of the speakers.

Here and here are room mode calculators that you might find handy.

Jim

Thank you.