Need some advice on Mojo sub

[BoostedGenny]

Alright I have a 15 inch Memphis Mojo M6 and a srx.1000 watt Memphis amp. The Box is a Memphis single 15 ported enclosure just under 4 cubic feet of air space. Hooked everything up just like I have the other 500 times I've installed a system and this is the worst sounding subwoofer yet. The bass is not very loud, there is barely any "bump" or deep bass at all. All the equipment was checked and in good running condition but I haved 10 inch Memphis PR subs that sounded better hit harder and had more bass. I'm running 2/0 wire with sanded ground areas and a complete Memphis wiring kit. I also have a Memphis 500 amp pushing the door speakers and jvc Touch Screen head unit. Any thoughts or advice?

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