also, note that your distance (delay) setting on a sub with DSP will be like 20+ ft as a result of the chip. So even if physically it is like 8-10ft, it will come out 20ft plus. Only the Axiom subs I've seen this issue.
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M80s-VP180-QS8s-EP600-2xEP350 Denon3808 Outlaw7700
M22-OWM22-VP100-Denon2805
Audio Nirvana