As far as I know, the genelec 8030 uses fairly high end drivers, and a not so cheap enclosure. The woofer seems to be a customized peerless chassis, based on peerless SDS series. The tweeter is genelec's own design and make. Somewhere I read on that tweeter, from a genelec engineer. Not sure if my memory serves me well, here goes. A properly designed aluminum dome does not have break-up below 25khz or so. No need for the expensive beryllium (also very expense to manufacture within margins, and health hazards). Big benefit of aluminum is that it is cheap, cheap to produce within required tolerances, and heat handling is very good. All in all, difficult to beat below 115 db, on price, spl, as well as quality. BTW, check out the expensive Piega speakers, I guess those also use peerless SDS.
For the price, the 8030 is exceptionally well built. Personally, I replaced my JBL305 by the genelec for two reasons, (1) the looks, and (2) the size, assuming it would sound at least as good. Boy, was I surprised, the sound quality of the 8030 is so much better.
(No, no, no shares in genelec, no family, no bribes ;-) just a very very happy user here, 35m2)