The WHARFEDALE's DELTA X15B passive speaker is the newest addition to the Delta line, and it offers the same quality and longevity as its larger competitors, as well as comparable power and SPL handling. The delicate crossover electronics have been re-engineered with improved component location and bracing to improve long-term performance and reliability, even at the greatest volumes. This passive speaker provides 700 watts RMS of power with a 4.0" voice coil and a 15" low distortion cast frame woofer, while the 90° x 45° waveguides ensure long-throw projection. It also may be switched between Bi-Amp and Passive modes on the back panel. Delta X systems may be fine-tuned with various amplifiers and external crossovers with this routing flexibility.