Whatever....nice to see you here.

I've listened to several of the tractrix horns. This would include the V-trac 260, The Tractrix 223, and fast tracs. Basically the same designs as the Trachorn but with different cutoff Fc, Throat size changes, and different mouth dimensions to fulfill their application.

These pure tractrix horns walk all over the K400/401.....easily. I wouldn't hesitate at all to make the change. I would say the horn change with give a bigger plus than the network changes (which I'm a fan of as well).

jc

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McIntosh C2200 MC1201 (x2) MC275 V (x2) Bryston BDA Ashly XO/EQ with huge horns
Technics SL-1200MK2PK MC275 V (x2), MC250 (x2), and QSC PLX, Ashly XO/EQ, Juicy Music Super Merlin with huge horns