[quote name='Bill Fitzmaurice' timestamp='1387076258' post='2308043']
+1. Within reason you can get pretty much the same result with any cone size from an eight to an eighteen, with the single exception of the dispersion angle. It isn't all that practical to get 30Hz out of eights, or 4kHz out of eighteens, but it can be done. There is absolutely no characteristic ten vs twelve vs fifteen sound.
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A couple of weeks ago, my guitarists found out what dispersion is when the room we hired had a 4x12 guitar cab, stood right in front of it & kept turning it up because he couldn't hear himself. I suggested that he move further away & he stepped forward & to the side. He still thought he was quiet.
The other guitarist pulled him over to where he was standing, straight across from the cab & he stood there for the rest of the sesh (& turned down too).