The Demand D15 (3400 Euro per pair), Demand D17 (5000 Euro/pair) and the D5c Center (900 Euro) are equipped with carbon woofers and aluminum tweeters. The asymmetrical sound conduction of the tweeter is intended to reduce unwanted symmetrical diffraction at the corners. Two laterally mounted passive diaphragms support the bass reproduction of the two three-way floorstanding speakers. In the D15, two 14 cm woofers at the front – two 17 cm chassis in the D17 – radiate the low frequencies. All 3 models are available from February in black piano lacquer or five-layer white lacquer. The front panel is made of aluminum.