So, a while back I posted a thread about how my Low b on my 5 string was distorting. Well after switching up my rig a little, I'm having a similar problem. Right now, I'm using a friends 5 string Yamaha bass going into my Kustom Groove Bass 1200HD, then into a single 1x18" cabinet loaded with an EV EVX180B speaker. The sound that's coming out of it when I play my B string it sort of half distortion, half farting sort of. Kind of like the sound a speaker makes if you were to tap it with a pencil or a screw driver plus the sound it normally makes. What could be the problem? Blown speaker? I checked the battery in the bass and its fine, no problems there and the head is in perfect working order. I've narrowed it down to the cab. Could it be the wiring in the cab?