One DAC to Rule it All

Convoluted? It's really nothing more than an active crossover (in digital form) splitting the signal between my mains and subs at 100Hz. I realize I could send the full range signal to my main speakers, and just use the DBX to the subs, but as I said I had done that for a long time and recently found that keeping the <100Hz from the main speakers gave me a nice increase in resolution. Other than going to a DEQX Premate to do all these features including the DAC from my server, I don't see any other way to get a 48db/oct. slope out to both the mains and subs for a reasonable cost. Also a 48 db/oct crossover in the analog world would be quite a complex and convoluted thing as well.

This isn't a simple cable swap. It would mean a lot of rewiring to go back and fourth. I was hoping there would be a consensus as to which way would be better.

I had been doing it the "old fashioned" way until I got the DBX. I found a great improvement upon sending only 100 Hz and up (48db/oct.) to my main speakers (Reference 3A NEFES II), and just below 100 Hz to the subs (same slope). I wasn't expecting such an improvement in detail, but I must confess it was there. I'm just wondering about the double digital conversion. I truly believe the OKTO to be the better DAC, but it won't do the crossover and other things like parametric EQ. So, it's either both, or just the DBX doing it all.

I also want to thank everyone for sending in their thoughts. I suppose dipping my toe into the digital realm more than once is considered blasphemy in home audio, but I am getting very enjoyable sound. I am considering the DEQX route as their internal AD/DA are of a higher quality. So even though I am seeking advice, you're all correct in the fact that I just have to try out all these configurations to see for myself. I will experiment and keep everyone apprised.

That's what I was thinking. Why use the OKTO at all if the DBX can accept an AES/EBU signal from my streamer. That way I will only have one conversion, but I will have to use the 32 bit volume control in my Auralic G1 instead of my Benchmark HP4 preamp. It seems like I will be getting rid of a few pieces of equipment if this works out.

My subs are 15" drivers in a 3 ft^3 sealed box. They are powered by a Crown 2500 amp, and the drivers are 4 Ohm. My listening room is large because my home is an open floor plan and the system is in the living room. 

I'm going to the Tampa hi-fi show tomorrow and I will ask around what others are doing too. For now I will stick with the DBX unit to learn all its functions before ditching it for something else. That way I will have more knowledge before embarking down another path. I'm interested in the DEQX units, but they are delaying their release of some new pieces. I don't know why.

Well, my subs were originally Velodyne DD15', but over time both plate amps broke down and even the one I got repaired broke again. That was it for me, so I opened them up and ran the driver wire to some banana jacks that I installed on the plate amps. So they still look like DD15' (nice glossy black), but they are now passive.

@mirolab 

You're right. My Benchmark preamp will not work to control both the mains and subs. Luckily my Auralic G1 server has software volume (32 bit) and works really well through my iPad. As you say I will be just "messing around" with this setup to see how I like it.