Hi. I have a pair of the 4343 Studio Monitors that I use in a room approximately 15' x 20'. These speakers use essentially the same components as the L-300 (15" woofer, horn loaded mid/tweeter + super tweeter) except the 4343 is a 4 way design by the addition of a 10" midrange. My 4343's sound ok at low levels (levels where you could carry on a phone conversation at the same time) but they really shine when you when you start to crank them up a little. It really doesn't take much to get them going. With my system I rarely listen to them at much more than quarter volume. This is a volume that is not so loud that my wife can't watch tv in the next room, with the door closed of course. I never listen to them where neigherbors would ever notice. But at these mid volumes they just sound awesome.
I started out with a pair of L-100 and then progressed to a pair of L-65. And each was good given the budget I was working with at the time. But after listening to the big format JBL speakers I would never want to go back to either of those smaller speakers. There is just something about JBL's 15" speakers coupled to the horn loaded mid/tweeter that make them addictive. At low volumes I don't think the L-65 or the L-100 would have an advantage over the L-300. Actually if you lined up the L-300, L-65 and the L-100 next to each other, I think that at ANY given volume, low, medium or high, the L-65 will always sound better than the L-100, and the L-300 will always sound better than the L-65. Save yourself the time and go right for the L-300's. If you have the room for them I would definitely recommend you get the L-300's. Going with the L-100 or L-65 would only be putting off the inevitable. If you don't, you'll always wish you had.
