My KLH12 speakers came with a sophisticated "outboard" crossover that looked like a preamp, with a nice wooden case, with knobs to shape the sound spectrum by attenuating the various drivers. Two sets of cables were provided. One set was about 3 feet long for use if you were going to put the crossover on top of the (floorstanding) speaker. The other set was about 20 feet long for use if you would locate the crossover in the equipment rack.
I never thought there was any difference in the sound.
I never thought there was any difference in the sound.