I've now talked with Gary at Ayre and Phil Marchand, both of whom think a Marchand fully balanced passive high-pass filter could be inserted between the Ayre KX-5/20 preamp and VX-5/20 amp with no harm to the Ayre sound. So I've ordered the building of a 80 Hz 24 dB/octave filter. Its arrival is probably some weeks away at which time I'll reset the low-pass to the subs to match the high-pass crossover and slope.
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