Abstract: A loud speaker system can include a single woofer and two separate high frequency tweeters coaxially arranged, with the tweeters in back-to-back relation. One tweeter generates a high frequency pressure wave in the space proximate to the woofer diaphragm. The other tweeter directs a high frequency pressure wave directly away from the woofer diaphragm. The woofer diaphragm acts as a reflector for the first high frequency wave, so that the first high frequency wave radiates along the woofer diaphragm surface for merger with the other high frequency wave. The merged waves produce a high frequency wave front having a desired density and wide dispersion window.