If you can find a pair of the Pure Note Sigma PC's, your search will be over. I use them on my Krell FPB amps and the improvement was not slight.
I have an actively biamped system, and when I tried them, on just one, not only was the quality of that amp improved, but I had to turn up the crossover on the amp with the original cord. When I got the second Pure Note, I was able to put the balance back to normal.
You may have to wait to find them used, as they are no longer available new. Construction, and material costs went up too high to produce them.
You have great amps!
Richard
I have an actively biamped system, and when I tried them, on just one, not only was the quality of that amp improved, but I had to turn up the crossover on the amp with the original cord. When I got the second Pure Note, I was able to put the balance back to normal.
You may have to wait to find them used, as they are no longer available new. Construction, and material costs went up too high to produce them.
You have great amps!
Richard