Do the DSP circuits in the EP subwoofers cause a phase delay vs the non DSP subs? If so, by how much or how many degrees?

Thanks

None of us would have info as to the extent of the delay in the DSP circuitry. You might try contacting Axiom directly, but it may be difficult to retrieve that data. In any case, auto-calibration systems should compensate for this.

Sounds like reverb