I, too, can wholeheartedly recommend electronic crossovers made by Marchand Electronics. I use the XM66 2-way crossover: it has variable (user setable) crossover frequency; 24 dB/octable slopes; is single-ended; had a pot for each of the 2 outputs that allows me to fine-tune the output +/- 1 dB per click; and has a damping control that allows adjustment of the output around the crossover point.
I bought mine used for $500 about 10 years ago. I’ve used it 12+hrs/day ever since without a single problem. It does everything right and nothing wrong. I find the sound very transparent, nearly impossible to determine whether it’s in or out of the circuit. My only complaints (and they aren’t even complaints):
- The input pair of RCA jacks on the back are starting to shed pieces of the white insulation that line the inside of the jack. The unit is at least 15 years old and I’ve changed outputs occasionally, so it’s not fair to complain about this. One of these days I’ll send it in to get 6 RCA jacks swapped out for new ones
- And I wish I knew where and what type the opamps are; which ones are safe to roll; and whether my favorite opamps (Sparkos SS3602 dual channel) are OK to roll in this crossover. I could find all that out, but it works perfectly and sounds great already, so I’ve never put my ass in gear enough to do this.
I wouldn’t hesitate to buy a new one of these, or the somewhat less expansive XM-9 crossover that uses little frequency cards, rather than have a user-selectable crossover like mine does.