Great subs !!! performed better then i expected ! deeper bass then other subs i used of same wattage ! and good sound Quality too ! small enclosures which was plus .

None ! but would have liked if they made 15" in same model .

overall great sub ! performed great ! good bass reproduction ! good sound quality ! great sub sub for low cost !

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i have used JL W6's, Rockford T1's, MTX 7500's !