my experience with large subs is that the frequency is to low and for me to hear close up , so is it ok to get 2 different size subs to cover a wider spectrum of bass or get 2 matching subs?
You’ve described my successful approach to increasing the low frequency SPL in a sound treated 24 x 18 x 8 ft listening area. The front wall has 2 corner placed Rythmik subs supported by a pair of smaller REL’s as one on each sub wall on each side wall. My speakers are Voxativ single drivers — fast and midrange rich, but relatively bass deficient.