Norman P

I have a Fender Rumble 15 I use in the practice room. It used to be booming on some note and dead on others. I tried a compressor, with limited success. I was ready to buy something else. Then as a final fix I decided to deaden the cab. I got some 10mm thick carpet underlay and lined the cab with a double layer, sticking it in place with a standard spray adhesive. The difference is amazing. Even tones and a deeper base response. It’s such cheap and simple way to improve sound. I recommend anyone should try it before giving up on the rumble 15. The only minor problem is the cab is sealed, so the work has to be done through the speaker hole in the front baffle.