Wanted to share a setup I did and found working quite well but I have further questions regarding more advanced setups:
I have a Celestion 6000(very old) system with the system controller and 2 subs. Since the subs are dual opposed open baffle subs(they cancel out lower bass) but sound terrific with my Magnepan LRS.
But the System controller that is needed to boost the bass 6db/oct doesn’t do a very good job for the 100hz HPF to play with the LRS. I had to find an alternative and my best result so far was using roon to bypass it completely. I did lose the ability to play my Turntable with this system as Roon is Digital/Tidal only. A MiniDSP could do the same but I would probably have a bad experience with the DACs built into the minidsp.
Here’s the current setup:
Tidal>Roon v1.8>DSP settings with two linked Zones. The first zone is being used for the LRS with HPF and the 2nd Zone with the SUBS with an LPF+REW
Zone1>SMSL SU-8 v2 DAC with 2 xES9038Q2M chips>Roon DSP with HPF of 50hz 12db/oct>AMP 2 x Monoblocks Hypex NC1200>speakers: Magnepan LRS or MG12QR
Linked Zone2>Topping D50 DAC with 2 xES9038Q2M chips>Roon DSP LPF 70hz 36db/oct and added REW filter via Convolution option>AMP-Cambridge Azure 651W>2 x Celestion 6000 Dipole Open Baffle subs
Are there sync delays between the two DACs when linked in the zone? Ideally RAAT handles this. I haven’t been able to find which settings I need to use for the Clock master priority levels to ensure one zone doesn’t drift apart from the other since I use both at the same time for Main+Sub
Given roon handles a maximum of 6 zones(or is there no hard limit?), could I use a setup like above to make a completely active speaker setup(Zone 1 for Highs,Zone 2 for Mids,Zone 3 for Lows,Zone 4 for subs). A 4 way custom active system with no physical crossover
Would using exactly the same DAC for each zone help for synchronising the groups? Like above I have two different brand of DACs but with the same chips being used. Does that help?
I tried something like a couple of years ago - using 2 DACs in a 2.2 system. @brian thought that RAAT would not keep the two DACs sufficiently in sync. I looked at options using multichannel DACs (e.g. Octo Research) but ended up with miniDSP SHD. This allows crossover to be set, includes PEQ (which can be set by importing filters from REW) and also Dirac.
I compared the SHD to Benchmark DAC 3 (before selling the DAC3) and found only very small differences (did a level matched blind listening test with my partner) - preferred DAC 3 on some tracks and SHD on others - but differences were very small,
Some other miniDSP options:
NanoDigi - takes SPDIF input and provides up to 4 SPDIF outputs each of which has 2 channels - DSP has crossover and PEQ. I tried this approach and it worked well but I decided to go for SHD because it also has analog input so I can apply room correction to vinyl source.
U-DIO8 - I haven’t used this but PoS (who developed rePhase) has. Roon should see it as an 8 channel DAC. It has USB input and SPDIF outputs. Crossover and Room Correction would be done in Roon.
SHD Studio - doesn’t have DACs and doesn’t have analog input - but does have PEQ and Dirac - you could use SPDIF outputs to drive DACs. Whether the DACs would stay synchronised I’m not sure.
Thanks a lot for your feedback. Yes I am considering exactly this product as a better solution to the current 2.2 i’m doing. Do you use the volumio streamer, is it good and does it play MQA tracks up to 96khz fine? I know it can’t play any higher since minidsp doesn’t do MQA. I mean the roon 2.2 setup works fine, but a friend told me to check the sync between different DACs as he does a 4 Way stereo setup using something like the U-DIO8 for the digital crossover and room correction and sends the signal to 4 DACs with 2 x 9028Pro chips in each + super expensive horn setup comprised of electromagnets only. Best system I’ve heard by far, but he would like to try something like Roon to do a similar setup if possible.