One of the posters here combined two Axiom DSP subs with two SVS cylinder subs, to give a blend of good frequency response with highest output/$$. The result was the best HT system I ever heard, so definitely not a bad idea.

My first thought would be to reword the question as mixing DSP with non-DSP subs, although ported subs can (depending on configuration) have the advantage of generating bass output from two different locations for slightly smoother room interaction. EP350 ports are fairly close to the driver so you probably won't get much of that effect though.

Personally I would just add two of whatever sub appealed to me the most and make sure the levels were set so that all subs hit their limits at approximately the same time.

For what it's worth, I'm running an SVS PC+ 20-39 (which I bought back when EP350 was Axiom's top of the line) and an EP500.


M60ti, VP180, QS8, M2ti, EP500, PC-Plus 20-39
M5HP, M40ti, Sierra-1
LFR1100 active, ADA1500-4 and -8