Is the bass's active circuitry putting out too hot of a signal for the amp to handle? You can sort of check it, relative to other instruments, using an interface. Depending on the preamp circuit, there may be a small potentiometer inside the control cavity you can adjust with a screwdriver to lower the output gain.
Are your pickups overloading the input on the low string? If the pickups are physically quite close to the strings, you could try backing them off a bit.
Distortion and overdrive naturally cut low end. You could try a bit of that in front of the amp.
If it persists after this, since the problem notes are below 30hz, we could try to find an equalizer with a notch or high-pass configurable at/near 20hz, and cut it some.
Failing that, you should really take the bass to a music shop, plug it into a few amps, and see which ones have trouble. If you've got no equalizer, there's another thing you can test while you're at the shop.
I have an E0 bass, and a 1000w rig, ashamed to say I haven't used them together yet at volume. At any live setting of any formidable size, your rig is only going to serve as your stage monitor anyway... something to think about... part of getting a good sound might involve using that equalizer or overdrive in front, whether or not you replace your rig with another that can handle it 'straight up', so that you can send the sound guy a signal with all the sub-mud rolled substantially lower than the juice of the signal. This rig might be a blessing in disguise because sticking with it forces you to start with a more appropriate signal in front![Smile :) :)](data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7)
Are your pickups overloading the input on the low string? If the pickups are physically quite close to the strings, you could try backing them off a bit.
Distortion and overdrive naturally cut low end. You could try a bit of that in front of the amp.
If it persists after this, since the problem notes are below 30hz, we could try to find an equalizer with a notch or high-pass configurable at/near 20hz, and cut it some.
Failing that, you should really take the bass to a music shop, plug it into a few amps, and see which ones have trouble. If you've got no equalizer, there's another thing you can test while you're at the shop.
I have an E0 bass, and a 1000w rig, ashamed to say I haven't used them together yet at volume. At any live setting of any formidable size, your rig is only going to serve as your stage monitor anyway... something to think about... part of getting a good sound might involve using that equalizer or overdrive in front, whether or not you replace your rig with another that can handle it 'straight up', so that you can send the sound guy a signal with all the sub-mud rolled substantially lower than the juice of the signal. This rig might be a blessing in disguise because sticking with it forces you to start with a more appropriate signal in front