The new Radiance line from Acoustic Energy, one of Britain's finest speaker makers, includes tower, monitor, center, and sub models with varying configurations built around 6.5-inch woofers, 5-inch midranges, and 1-inch tweeters, all aluminum. Thermal management -- that is, letting heat escape -- was a design priority, implemented with a double voice coil that sits both inside and outside the former. The ring radiator tweeter is designed to match direct and reflected sound into a seamless whole. The minimalist crossover uses no resistors. A 5.1 set with towers in the front left and right positions will sell for $6200, while four monitors, center, and sub will go for $4400.