Electronic cross-over on pre-amp out, to split signal to subwoofer and bookshelf speakers

Electronic crossover will be second step. 

@dcaudio ...sounds like a plan to go forth with....👍  Simple first to test the potentials and stumble over a drawback or so...
Then the focus knows where to hear and how.... ;)

Good variable factors! J

I can personally highly recommend Marchand Electronics, very high quality gear at reasonable prices, options galore, and excellent service. The owner called me to double check that I hadn’t made a silly mistake in ordering. Of course, I had, and he saved us both time and headaches by being a savvy business owner and electronic engineer. 
 

enjoy the listening,

Dave

I used a CR1 to eliminate the vertical axial room mode at ~60Hz from the speakers. It was easy to hear and measure ( using REW) the difference.  This is with two different speakers. I did not realize a  distortion reduction or improved volume overhead. Unfortunately the CR1 caused a slight haze and dynamic reduction, so I went back to the axial mode problem. The CR1 does have a great feature set and is probably the most liquid crossover on the used market in terms of price. 

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.