Crank your AC15 and play it in the basement, it will destroy your hearing pretty fast without protection. I used to take a homemade 5W amp outside and hear it echo in the woods. Fun times. Quick math—the Vox AC15 has speakers with around 100 dB SPL@1m,1W sensitivity, so if you’re cranked then it’s +24dB, and if you’re 2m away then that’s -12dB, and that’s 112 dB SPL, somewhere around “car horn” or “chainsaw” on the loudness chart. Medical literature puts it at under 1 minute before permanent hearing damage.

It’s not like a stereo where 15W is weak. A 15W guitar amp is pretty damn loud.

If you don’t crank it then I don’t see the point. Or don’t hear it, anyway. I can’t stand the sound of a clean Vox. It’s gotta have some grit.