So my schools amp (150w GK backline 15 15 inch speaker combo, the really small gk) is distorting. We use it in a basically all jazz setting, amd we almost exclusively use an upright bass on it.

Its distorting. But not like pedal distortion, or amp turned up too high distortion. Like, the signals breaking up in route to the speaker distortion.

Tried two patch cords and had the same problem, will be trying a third tomorrow.

Going to try the bass on a different amp, and the amp on a different bass to trouble shoot and find out what the problem is.

In your experience, what is it most likely to be?
Hasn't happened to me but sounds like loose wires somewhere. My guess would be the amp.
The GK Backline seris have a bad reputation. The first thing that breaks on a backline would be the speaker. So it wouldn't surprise me if it were the speaker.
Quote by IndianRockStar
The bass SHOULD cover the bottom end at the very least.

70's MOD Jazz->
Hartke HA3500->
If the amp has an input level control, turn that down. Might also be called gain.

Fender Standard Jazz Bass
Artec Matrix Pedal Tuner
BBE Optostomp
Boss GEB 7
EHX NYC Big Muff
Ashdown MAG C410T-300
Torque T100BX
GAS-ing for:
Boss SYB5
Behringer Intelligate IG9
This was happening when I was testing gear at work yesterday. It turned out that the cable was bad.

Other than the cable it seems like an amp problem to me.
Ibanez SR505

EBS MultiComp

Ampeg SVT 4-Pro
Ampeg SVT 810E