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Mysterious Farting

I noticed that as I hit lower notes, my cab sounds like it's farting out. Honestly I don't know for certain if I'm using the proper language here so I'd be happy to hear some clarification...

It seems like the sound is distorting. And as the note fades the distortion seems to lower, but it's not like a volume-induced on or off. I notice it around A or Ab and it stays there all the way to E. It happens even when my volume is low. Like try not to wake the kids volume.
Actually I just plugged in and I notice it all the way up to E (3rd sting, 7th fret, what is that E4?) And it is more pronounced with higher volume and with my bass knob boosted. I'm playing a Warwick FNA which has a MM style humbucker with active electronics.
The mysterious thing is that with my other bass I don't hear it at all. It's a Yamaha Attitude Standard which is a PJ style bass and just volume and tone and a 3-position selector switch.
I'm playing through a Genz Benz Shuttle 6.0 and an Avatar 210. It's mostly flat for eq, and I still hear it even when the bass is cut all the way.
It seems like it should be happening on both basses, so what's up? Any thoughts? Anything I can try to do to figure out the cause?
Thanks

Edit: Just googled it cause I had to know. Low E on bass is E1 and the note I was talking about was E2.
Pickups too high? Plucking too hard? Gain too high?
 
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