Subwoofer sudden drop in volume output

[sc300jz 10+ year member]

Well I just got a alignment, and my sub was working before it and on the way home I realized no bass!

I'm running JL 500/1v2 with a 12w3v3 with a line out converter(Scosche Loc80 2-Channel Adjustable Lineout Converter).

All my wires are in working order and the sub still hits but its barely noticeable. If I turn up my bass it hits a little bit harder. I can visually/physical see that the sub is still moving. I am thinking the only thing that I can think of is the LOC.

I've done some research and they are saying it could possibly be the LOC or the RCA cables.

Any suggestions?

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