This loudspeaker features a large-element true ribbon tweeter flanked by a quad of 5" woven cone midrange drivers mounted in their own sub-enclosure- isolated from the 12" dual-vented bass driver. These drivers are seemlessly integrated together using a true 2nd order Linkwitz-Riley crossover with metalized polypropelene capacitors and high quality air-core inductors at 500 hz and 2,500 hz respectively. These speakers are very detailed, accurate and "fast" without ever sounding strained. They present a very benign 8 ohm impedance due to the copper ring and neodymium magnet of the 12" bass driver and smooth natural impedance of the upper-range drivers!