Well the guitarist in one of the bands I play in uses a Tele through 7W amp we built for him and gets a great Who/ Lizzy rock sound (especially when he plays the write notes!), which we mic up. The amp has a 12" speaker (G12H), which helps a lot. Eventually we will probably make him a 15W amp to give a little more clean headroom and put less through the PA.
You are going to struggle to get a good rock sound using an 8" speaker.
Yeah, my reasoning was based on what I used to use live. It's a 50w m/v valve amp, but it's 1x12 combo (open backed).
For Vocal-PA gigs it was plenty - although I have to admit (for the stack & 2x12 guys) it could sound a bit boxy out front if I couldn't get a good position. We usually managed to tweak it enough to get it acceptable, though.
Our preferred method was in bigger gigs where everything was mic'd. Really early on I learnt that I needed to put the amp at the side of the stage, pointing across the stage, even behind the PA stack if possible. That meant my backline was contributing as little as possible to out front, giving the engineer more control. It also meant we needed little if any guitar in the foldback.
It might not have looked very rock n roll, but out front it sounded HUGE and very rock n roll :lol:
With what I've learnt since about amps etc, I believe a 15W with no master would have done me fine :D (probably even the Vocal-PA jobs)
I don't think I've ever played through an 8" speaker, but I did use a combo with a 10" (a Peterson P120G - anyone else ever used one of them?), it was OK live, but enough to show me I wanted 12".