I have a guitar amplifier which I do not use, and I want to convert it into a bass combo amplifier. What if I want to switch out the guitar speaker with a bass speaker? Where would I buy one? Are there any considerations for this type of speaker transfer? If so, where can I purchase a 12 inch bass speaker? Are there any speakers which are better than others? It's a 12 inch guitar combo amp with a distortion and clean channel. It does not have a tweeter, but it does have a speaker out from the power amp. Can anyone give some advice?