Help with extremely 'boomy' muffled bass from StingRay Special 5 HH

Howdy all, I’m about near wits’ end and thinking of parting with this bass. I have no idea what’s wrong with it and have been trying to fix it.

The low end is basically totally overwhelming everything else. It seemed fine in the past?
I can hear the throaty/growly aspect StingRay’s are known for underneath it, but this massive muffled bass is overpowering it.

It’s like someone threw a blanket over the sound and that’s what I’m hearing.

I’ve…
1. Changed strings.
2. Changed batteries.
3…

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