Re: Bedroom Levels
Generally speaking this depends on a LOT of factors and a lot of them are super subjective.
To answer your question we need some context:
a) what are you going for something like George Thorogood where there's just a bit of raspy crunch, modern extreme metal where picking the notes out of all the harmonics is a challenge or somewhere in between?
b) what are you plugging in to? You said it's 15 watts, but is it a master volume or a high gain low watt amp?
c) what are you starting with? A traditional strat type guitar with low output pickups or a Slug humbucker that's kicking out 1.21 gigawatts into the front end of your amp?
If you're going for George Thorogood, have a vintage like pickups and you're using a non-master volume fender amp... I'd get a Weber Mini-Mass as that would dial in that power tube grit just right.
If you're going for popular extreme metal band sound, have a Soldano Astroverb and and mega output pickups... the tubescreamer might tighten the tone up a bit....
Give us a little more and we help a bit more.