CONNECTING A SUB WHEN THERE IS NO SUB-OUT CONNECTION

@macg19 wrote "Really nice system. I’ve owned BAT gear in the past - not at your level but I did enjoy it." 

RESPONSE - Everything goes on sale if you're patient.  I don't like to compromise and will wait to get what I want at a price I'm willing to pay.  I've been mostly patient--except of the DAC purchase.  One came up and I sold my a$$ on every corner to get it.  It's no longer offered.  I heard that BAT could no longer get boards supplied from Playback Designs and the Rex 3 DAC was never a commercial success even though it's likely one of the best DAC available at any price.  

@macg19 also wrote "But often guys are trying to offload the amp duty rather than the speakers. You’ve got loads of high quality power driving the mains and I doubt the mono blocks are breaking a sweat so I wouldn’t worry about it. "  

RESPONSE:   I'm using Martin Logan Dynamo 10s which have built-in high-powered amps.  Because my speakers are full-range e-stats, I'm thinking that if I can take everything below about 50hz and run those low frequencies through the subs, the panels will be happier. I'm still trying to dial it in.  

I have a Rogue Audio RP-9 preamp with two sets each of XLR & RCA outputs.  I have been using one set of the XLR outputs to run two subs.  I will get my converted to stereo monobloc Odyssey Kismet amps in a few days and will be using both sets of the XLR outputs for the two stereo amps to vertically bi-amplify my Fyne speakers.  I purchased a pair of Neutrik RCA to XLR adapters to then drive the two subwoofers off of one of RP-9’s RCA outputs.

I would insert a 2 in, 4 out, balanced, active crossover of your choice, between your preamp and amps. This would enable you to achieve greater overall system performance, increased dynamic range, better clarity, cohesion and precision and to a lesser degree the ability to address some of the acoustical issues created by your room.

When I first incorporated subs into my system, some eight or nine years ago now, I started with the high level input like most everyone else. About a year or two later, just for fun, I tried an active crossover and it ended up probably being the single largest improvement to my system that I have ever made.

I purchased a JL audio cr-1 crossover which I understand is designed to work with high-end audio systems.  It's all analog, has balanced connections and, based upon my research, it’s the best available.  I should have it in a few days.

Does anyone have any experience with this unit?