I just bought a 1972 Fender Champ with the original speaker. I was wondering if it is any problem using a 12 inch 8 ohm speaker with it in place of the small 6 inch. I know that a Princeton that I had owned sounded great with a 12. The back of the amp for the speaker says, 6 watts rms. And it also says 32ohm . I've never seen 32ohms on the back of an amp. Info appreciated. Thanks!