Call Jeff at Sonic Craft about crossover and wiring upgrades.
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Bob - any update on your 104 makeover? I have 2 pair. I sent all the speakers from pair one back to KEF to be checked & repaired if necessary.....they sound great. Didn't touch the crossovers. I recently bought a second pair which had had the donuts repaired......they were really boomy so I closed up half of the bass port and they sound great too but still different than pair one. I"ve wondered about the crossovers.