Well, here's the one to bring the average back down. Had the lurgey the last 3 days and finished this off tonight, as i thought i was feeling better. My ears are blocked, so it may sound more weird than even i intended:
It sounds to me like they may have fitted an incorrect value potentiometer for the volume control. Is there the option of taking it back to the vendor?
Another thing: is the compressor engaged?
My Trace Acoustic cube has a notch filter for this. It's a narrow frequency filter that you can tune to your problematic frequency. They also do it in an acoustic preamp pedal. I've not used it with acoustic bass, but it should work a treat.
5 wall hangers in the office, 3 on a stand in the spare room and 1 leaning against a wall, 3 basses, 6 guitars. Amps, cabs, drum kit all set up in the rear third of the garage I've had boxed in and insulated. Oh, and the recording gear too.
No, screen printing is the technology for t-shirts.
This would be more suitable for mounting on those large frameless, er, frames. The ink isn't fixed (washable)