This unique group of products is designed to integrate perfectly with trending designer lighting that is very small diameter – typically 4 inches. The 3″ Kevlar woofer of the D39 combined with the aiming silk dome tweeter handle frequencies from 100hz to 20Khz with ease. The DSUB6F3 hidden subwoofer handles the range from 33hz to 100hz filling in the bottom. Together they combine to a formidable system with wonderful sound. Read more here!