[*Scotty*]

Just a heads up for those DIYers wanting to use more than one sub-woofer in their system and needing DSP delay of the output of the subs. Madisound has plate amplifiers from mini-DSP and Hypex with digital delay capabilities. This means that you can build sub-woofers that can be placed a the back of the listening room or other locations and their output can be delayed to achieve flatter in room bass response.
 The miniDSP plate amp has 10ft. of delay capability and the Hypex has as much as 15ft. of delay. In milliseconds this is equal to 10ms and 15ms respectively.
https://www.madisoundspeakerstore.com/amplifiers/minidsp-pwr-ice250-dsp-2-way-amplifier/

https://www.madisoundspeakerstore.com/hypex-amplifiers/hypex-psc2.400d-dsp-active-amplifier-with-digital-inputs/
A stand alone processor such as I use to do this job is no longer a requirement.
Scotty