Nothing quite like a JTM45 through a 4 x 12 when you are in a venue big enough to allow the volume to be pushed within the 6 - 8 sweet spot - ahh, memories. When playing guitar I use 1 x 12 combo's (20 or 30 watt). The JTM is only about 35 watts, but through that greenback loaded 4 x 12 it was magic and very loud.
Funny, I use 12 inch speakers for bass too......