Analog or digital crossover for subwoofer integration?

I'm not sure where this goes, but I have a 2-channel system and want to integrate a subwoofer (or two).  I'm looking at the JL F113 since I've had one before and really liked it.  My pre-amp is an NAD M51.  I run this directly into my amps (Wyred4Sound mAmps).  I want to put a crossover between these to pass high signals (probably 40-60hz) to the speakers/amps, and low frequencies to the subs.  I'm looking at either an analog crossover (Ashly, Rane, etc) or a digital solution (miniDSP, behringer DCX2496).  Since I don't really need/want the room correction or DSP stuff, does it make sense to just go with an analog crossover and keep things simple?
IME, successful integration of a sub is vastly easier to achieve in the digital domain. If you use strictly digital source material, I'd say it's a no-brainer, go digital.  If you use analog source material, there may be  a philosophical issue with ADC and DAC in your signal path, so it's up to you and your philosophy.

By the way, IME room correction will help with the integration process  immensely.  Once you eliminate all of the FR ireegularities in the x-over region, getting a seamless hand-off is so much easier.  

As always, YMMV.
I use strictly digital source material, but the crossover would have to happen after the DAC, because the NAD M51 is my volume control and switcher (digital preamp).  If I kept everything digital, I would do the processing before the NAD, but I would need to do so for all of my digital sources, making things a bit complicated. 

The JL has room correction built in, but I assume you're referring to room correction for the speakers, correct? 

One of the reasons I was looking at a strictly analog crossover was because I wanted to avoid ADC>DAC in the chain.  Adding any of the digital/DSP solutions would add this conversion. 
Though I think Rane and Ashly make good crossovers, they are not really geared for the subwoofer frequency range; they are general purpose 2-way crossovers. For analog, I would look at Hsu Research's crossover:

If you want to spend quite a bit more money, look at the First Watt B4. It's a general purpose crossover, but I think you have better control in the sub region.
If you want to spend a lot more money, look at Bryston's 10B-SUB or JL Audio's crossover.


Another option is to buy a sub with bass management built in. SVS subs provide that. 


Another option that you probably won't consider is to use an AV prepro as your preamp. This makes even more sense if you plan to use a pair of subs. The latest Audyssey can correct for a pair of subs individually. Plus, you get correction above the sub low pass filter setting.


Having room correction in the sub is better than nothing, but it won't have access above the low pass filter setting. In most rooms that leaves roughly 80 Hz - 350 Hz uncorrected. How much of a problem that is depends on your room and speaker/people placement.
Thanks bob.

I'm having a hard time finding what exactly is different about the Rane and Ashly than a Marchand, Bryston, etc.  I'm sure there are better quality parts, but they are all 24db/octave linkwitz-riley circuits. 

I looked at the first watt, bryston, and JL, but the prices just don't make sense for a $3k sub.  I'd rather have two F113s and a simple crossover than a bryston crossover and a single F113... 

Do you really feel that the SVS would have a better HPF than a Rane or Ashly crossover?  I'm doubtful that the crossover circuitry is any better and I'd suspect it to be worse.

And yeah, you're right, I don't want to go down the path of getting an AV pre-pro JUST for subwoofers.  I want to keep things simple.  I like the NAD, the DAC sounds great.

Also, I should mention that I run everything balanced and would like to keep it that way.  It's one of the reasons I'm looking at the pro stuff, it's all balanced. 

I'm almost thinking about getting the Ashly (I've ruled out the Rane because it has non-defeatable infrasonic and ultrasonic filters built in), as well as the miniDSP 2x4 and just trying out both.  At the very least, I should get their microphone and use REW to see what the room looks like.

I'm learning there are two options.  Get an analog crossover, which solves the crossover problem, has the least impact on the signal, but doesn't solve any other issues like room EQ, etc.  OR, go with a digital crossover or DSP, potentially introduce some noise or character in the signal path, but can do a lot more than just a crossover.
The issue that was a concern for me when I considered a general purpose crossover is the gradation of the crossover frequency setting. You will probably want something with fairly fine resolution (maybe 5 Hz) within the 60 - 100 Hz range. 

I agree that the First Watt, Bryston and JL Audio crossovers are expensive. I could never justify the cost. A decade ago you could find analog multichannel bass management controllers on the market and use only two channels for a stereo system. The digital world has driven them off the market.

I have no idea whether or not the HPF built into any sub is better or worse than a Rane or Ashly, but realize that you are paying for a lot more functionality with the Rane or Ashly than you need. A fixed 80 Hz HPF shouldn't be very expensive to do well and will work in most cases.

I made the switch from an all Bryston (BP26 preamp & 7B SST amps) analog system to an AV pre/pro just to keep things simple. I switched to active speakers as well. After almost a decade, I'll never go back. And I can't imagine not having room mode correction.

I've run an all balanced system for over a decade so I understand the desire to stick with it. One option is Jensen transformers at an unbalanced crossover. They are what Jeff Rowland puts in his gear.

To me keeping the signal digital for as long as possible makes the most sense from a high fidelity aspect. I avoid analog wherever possible.

Good luck.
For the record, I did much the same as Bob, jettisoning ARC and Joule preamps for an Onkyo prepro.  I don't use active speakers because I prefer omnidirectional response ( and, AFAIK there are no active omnis).  You might consider flipping to NAD's two channel integrated that offers bass management and room correction.  You could also try to find a used (discontinued model) Harman Kardon HK 990, which is another 2 channel integrated with similar capabilities.

As to an analog crossover, the Marchands are hit and miss, mine was just too noisy.  You could try to find a used NHT X-1 or X-2 (also discontinued) which is an excellent, cost effective solution - if available.