I listened to two Linkwitz Labs speakers. My favorite value per dollar was the LXmini; it is slender, perfectly toned, and quick-like a bunny. But, the larger, much more expensive ($3000) open baffled, quad-amplified LX521 kit shown above provided even more satisfying results. Complete LX521 kits may be purchased from Madisound in "sections"—a set of construction plans ($150), a flat-pack box of wooden parts for the baffles ($580), 12 SEAS drivers ($149 ), and the all-important analogue Signal Processor ($980). (What? Signal processor?!) Yes, each of these attractive, five-SEAS-driver, open-baffle, loudspeakers was powered by its own 5-channel Emotiva XPA-5 ($999). The LX521 "signal processer" splits the broadband line level input signal into woofer, mid and tweeter frequency bands. It equalizes driver and baffle response for each channel and filters it with LR4 response. The midrange signal is split after the power amplifier by a passive crossover filter into lower-mid and upper-mid driver inputs. These are great music-making machines and Siegfried is truly "The Man!" The expression, "giant-killer" is, in this case, not and exaggeration!