Help Tannoy XT6F with Primaluna


Hello all.
Just got a pair of Tannoy Revolution XT6F speakers. They are supposed to replace KEF LS50s. I'm driving them with a Primaluna Prologue Premium power amp. The new Tannoys sound awful with the Primaluna. Very peaky upper midrange and not much bass. Pretty unlistenable. Tried them with my old Rotel RB990 solid state power amp and they sound much much better. Tried the 4 and 8 ohm taps. Tried the stock Primaluna tubes and some KT 150s. No good. The Primaluna sounds great with the KEFs. Any ideas? Thanks in advance.
Ben
honashagen
 Well I have been trying everything I know to try. I have let the speakers play for hours on end. I have tried Cables, room position, Toe in tow out tilting forward tilting back. I still can't seem to tame that harshness. Things that sound good sound really really good but the things sound bad sound horrible. The kefs seem to be able to make everything sound pretty good. I even tried hanging paper towels in front of the upper driver. It did tame the sound but then the things that sounded good now sounded dull. I'm going to try a McCormack power amp this weekend.  I'm hoping for something good. If not I guess I have to sell the speakers. 

By the way none of this has been with the prima Luna. It's all been with the Rotel solid-state power amp. The primaluna will absolutely not work with these speakers.

Question for Al - I think you have probably nailed the issue in your second-to -last paragraph.

The question I have is - would it be possible to match the amp to the speakers via some type of custom built "matching transformer"?

I did have an issue with an amp many many years ago and had a matching transformer custom built by a very knowledgeable guy that built transformers for a living

Just trying to think of a solution for the OP - other than replacing the amp :-)

Cheers