Hi guys/gals, My buddy just bought an old red-knob era Fender BXR300C, and is considering upgrading the old 15" speaker to something with a little more "oomph". He's looking for old-school girth... a classic, non hi-fi tone. He plays a Hofner copy, and is a total Beatles fanatic. He needs an efficient, loud speaker that'll handle small to medium sized rooms by itself. What speaker would you recommend? I understand that cabinet volume measurements are useful, and asked him to measure it. I'll have those numbers asap. Thanks in advance!