I want to use software to perform crossover between main speakers and subwoofers (probably 100Hz 24db/Octave), apply FIR convolution filters for speaker / room correction (generated using REW / rePhase) and be able to vary delay to subwoofers to reduce room modes. Overall budget is up to £1,000.
I understand, from comments by @brian that the simple solution - having 2 DACs, connecting one to main speakers and one to subwoofer, applying filters in Roon to each one and then grouping them) will not work because RAAT will not keep the 2 outputs sufficiently in sync for this purpose.
Have thought of 4 ways to do this.
Use a miniDSP SHD. Crossover would be done in SHD using parametric equaliser. Equalisation would use FIR convolution filter in Roon (SHD does not allow user-generated FIR filters to be loaded). Delay could be in SHD or Roon. Advantage - all in one box. Disadvantage - over budget and paying for Dirac which I don’t want to use.
Use a mini DSP nanoDigi to drive 2 DACs. This uses SPDIF input and output. In theory, DACs driven by SPDIF should (if DAC well designed) stay in sync. Benchmark say that their DACs do this. I already have a Benchmark DAC3 so could buy used DAC2 and be within budget.
Same ideas as (2) but with USB input using miniDSP U_DIO8.
Either (2) or (3) but using same DACs e.g. Topping D50s, Topping DX3 or SMSL M8A.
If anyone has any experience of doing something like this or has used any of the products mentioned I would appreciate your comments - or suggestions for alternatives!