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2014 Fusion SE. Base radio with 4” screen, no factory amp. Line out converter to 2 amps. Signal from front speakers (full range signal).

I was running an old JBL 600.1 and an old IDQ 12 V2 single voice coil. That should have been 300 watts to the sub. It sounded good, but if I tried to drive it really hard, the amp would go into protection. After a few years in this car, I was having issues with the bass fluctuating and the sub quit playing. No funny sounds, smells or anything. It was old…

I’ve never had more trouble with bass than I am right now.