Very bright SC and IC with coherence in imaging, soundstaging and timing

+1 re trying different tubes in the amp. Also, what amp is it, and have you tried all of its output taps?

I suspect that the impedance of the speaker, which I presume is made by Cambridge Audio, rises significantly in the upper treble region compared to what it is at mid and low frequencies. If so, an output tap designated for higher load impedances is likely to result in a brighter presentation than a tap designated for lower impedances, to a degree that is dependent on the output impedance of the particular amp as well as on the degree of the speaker’s high frequency impedance rise.

If you already haven’t taken steps to optimize the amp/speaker impedance match, IMO doing so is likely to make far more of a difference than changing cables. As is some experimentation with different tubes.

Regards,
-- Al

Lots of requirements, lots of limitations, fighting physics, not much $. Bad combo. If you specify your amp, source, and tubes and wires you’re currently using it would help significantly in generating more useful recommendations here. Taking a shot in the dark on wires, maybe look at DH Labs Q10 cable and Silver Pulse interconnect — silver-plated copper might be your best compromise at this price level. Best of luck.

try mid level nordosts or mapleshade clearviews

I will try eq.

still open to cable recommendations. It’s a hobby ...

I have a couple pairs of Amadi Maddie Signature silver wire ICs and a couple pairs of Darwin Silver or Ascension silver wire ICs that are both very detailed, open, will light up the sound a little but with no harshness.  They are significantly better sounding than good cables such as Morrow MA-3 or 4, Crimson, mid priced Audioquest--have had all of them and some others.  Magnan, DNM, etc.   Am currently using Teo GC II doubles with the Schroeder Method and JW Reference doubles with the SM in my best system.  They make a great combination with my system.  

Bob