Sub cutting out

[wrkalot]

I have a 03 Town Car with the factor Alpine system. Factory installed, 4 Speakers and a powered sub. I replaced the HU last year with a Pioneer NEX 1440. Everything sounded great until 2 weeks ago when the sub started cutting in and out and popping. This happens at all volume levels.

I pulled the sub enclosure out and the speaker it's self looks perfectly fine. No cone deterioration etc. Is there a way to determine of the issue is the sub, the subs amp, or the HU?

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