Thanks for the link, Nick. I'm going to try a pair of the 2549 Mogami cables.
Al, it appears as though there may be a capacitance mismatch, so I may need to add capacitance using the device you suggested after I install the Mogami cables. I'll do some careful listening first. The sound is superb with the AQ cables I'm currently using, with no HF roll-off or thinning. There is a low level sizzle that I can hear if I put ear close to the HF driver, but not audible to me at my listening position. I hope shorter cables carefully routed will end that sizzle. I think the 2549s are designed to resist such interference.
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