Re: loudness for speakers...sensitivity or power?
To get a bit technical about it the loudness (or volume) you hear depends on 2 things - the amount of power you put into the speaker, and its sensitivity (efficiency). Sensitivity is usually stated as how many dB it puts out for a fixed power input at a certain distance (like 1 watt @ 1 meter).
If you're looking for cleaner sounds, a higher sensitivity speaker might help, because you won't need to turn up the amp as much to get the same volume (reducing amplifier distortion). A higher power speaker will also help, since it won't break up as much if amp power stays the same (reducing speaker distortion). For example, a 200 watt EVM-12L won't break up at all with a 50-watt amp, whereas a 30-watt G12H30 would be pushed past "breakup" into "blown to bits".
So, the ultimate clean would be a high-sensitivity speaker with high power capacity. Like the others have said, look into the Weber Michigan & California lines, unless you want to muck around with the used & vintage EV's and JBLs.
