I'll throw my usual spanner in the works by opining that I don't find my Cardas Cross cables to be 'warm' despite the conventional wisdom reputation associated with the brand (they're actually brighter- and faster-sounding than my Harmonic Tech Pro-Silways), and also that I've never heard Martin-Logans to sound bright in and of themselves (they've usually sounded a little laid-back through the presence range and somewhat rolled in the top octave). You don't state your specific components (other than the speaker cables) or speakers involved, so I'll hazard a guess and say that the impedance and capacitance issues inherent to 'stats *may* be combining with your power amp and speaker cables as a network to create the problem - it's been known to happen. But the other humongous issue with dipole panels is, of course, in-room placement, the effects of which can vary wildly, depending on just about everything. (I do applaud your desire to aim for neutrality as much as you can.)