Subwoofer crossover


Has anybody found a way to have an active digital crossover for a subwoofer with DSP inserted in the digital domain, i.e. between 2 dacs and a server? This would be a good way to combine high efficieny, tube amp driven speaker with a class D subwoofer on minimum latency. Any advice obviously welcome.
antigrunge2
I do it in DSP in my server.
..if the server offers that feature...I am not aware of any high end servers (e.g, Aurender, Lumin, Innuos et al) doing it and not interested in PC-or Mac- servers.

The point of this is to take the bass load off the tube amp and avoid the latency incumbent on a high voltage hook-up via speaker wires
..if the server offers that feature...I am not aware of any high end servers (e.g, Aurender, Lumin, Innuos et al) doing it and not interested in PC-or Mac- servers.
DSP will have significantly more audible value than any purported advantage of "high-end servers."
Kind of. 

Use a Y splitter at the preamp output.  On the way to the amp use a single capacitor.  This will give you a 6dB/octave high pass filter.

The other leg of the Y goes to your sub, where you can do whatever fancy DSP functions your heart desires.

Best,

E


@fuzztone

unfortunately no high speed USB out, so no DSD or sampling above 24/192. Thank you, though best digital answer so far

@erik_squires

Yep, that works. thank you very much, particularly since it also takes care of vinyl. One would though think that this would best be achieved in the digital rather than analogue domain.. I guess digital still has some growing up to do.
@kr4 

I don‘t agree: I used to run a tricked out Mac Mini from now defunct mach2mini running Puremusic in upssmpling mode. Have now moved on to an Innuos Zenith Mk3 and the difference is night and day. Power supplies as well as noise and vibration insulation are mission critical in digital playback.
And: no, the DAC‘s error correction does not sufficiently address RMI/EFI and ground borne noise. 
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Thank you moderator for preventing @djones51‘s hijacking the thread, he really has not very much to contribute to any topic from my experience
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@djones51,

it never is a pleasure to be lectured by someone who doesn‘t know what he is talking about and your constant harrassing of others is getting old really fast.
to wit: I am running an Innuos Zenith Mk3 via intona Isolator into a Antelope Audio Zodiac Platinum with Antelope 10m Rubidium clock into a Wavac EC300b. Analogue is Zyx Universe on a Dynavector DV507 Mk2 into a Zyx Artisan. In terms of resolution, that is as high as it gets and your comments about lack of resolution via tube amps is as unqualified as it gets. Your contribution is entirely negative and you obviously have absolutely nothing to contribute. I suggest you seek counsel.
If you had read the original post, you would have noticed that the idea to do the cross over in the digital domain was precisely to fight latency and distortion issues of the high voltage route. As the Zodiac has a digital output that could be used for the sub woofer, the idea of a digital crossover in the USB connection was to only pass non-bass signals to the tube amp. In that regard, @erik_squires suggestion to use a capacitor is really useful, all the more since it avoids the un-slaving of the server from the 10m clock that would result from an insertion of a further device in the USB connection. Unfortunately Innuos does not provide a BNC clock input.
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antigrunge2 said:
I don‘t agree: I used to run a tricked out Mac Mini from now defunct mach2mini running Puremusic in upssmpling mode. Have now moved on to an Innuos Zenith Mk3 and the difference is night and day. Power supplies as well as noise and vibration insulation are mission critical in digital playback.
And: no, the DAC‘s error correction does not sufficiently address RMI/EFI and ground borne noise.
OK.  Go down that rabbit hole but it is mostly obsessional behavior.
I use a DSPeaker Antimode 2.0 It will do what you want 
I have been doing it for 20 years. All the decent room control preamps have digital bass management. Check out DEQX, Anthem SLR and the Trinnov Amethyst. There are others. I use a TacT 2.2X which unfortunately is no longer made. I can change crossover points and slopes on the fly and AB results. Crossover points are anywhere between 30 and 300 Hz at 1 Hz intervals, slopes are 1st to 10th order. High pass and low pass are chosen independently so you can use any combination you want.  The problem with the TacT is it is complicated and difficult to understand and program. Companies understood that lesson and have made their units easier to program but at the expense of flexibility. 
All these units have internal DACs. You can use external DACs if you want but in the case of the TacT and the Trinnov there is no need for sure. I do not know about the others but great DACs are now a dime a dozen. 
antigrunge2, all you need for the mac mini is a good usb to SPDIF converter. Good ones will isolate usb noise from the clock. With the Berkley Alpha USB jitter is down under -125 dB.  Anything below -115 dB is totally inaudible. Most people can not hear -95 dB. Using a good converter the mac mini is as good or better than any streamer out there.
You get the advantage of much higher speed (if you order the right processor) and much more versatility along with infinite storage capability and Pure Music/Pure Vinyl which is highly recommended by many authorities.(for what it is worth)

When it comes to digital jitter is the big enemy. Only a trillionth of a second of timing error can create audible side bands on both sides of the primary tone. If a digital source sounds bad you can safely bet it has a jitter problem. Noise getting to the clock is apparently a common cause.