I heard an Epik Empire once, crazy performance. Almost got a few of them over Axiom, will always wonder.

http://www.epiksubwoofers.com/products.html
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M80s-VP180-QS8s-EP600-2xEP350 Denon3808 Outlaw7700
M22-OWM22-VP100-Denon2805
Audio Nirvana