Have you ever taken notice of horned instruments like trumpets, trombones, French horns etc; they’re basically a long flared pipe that gets wider and wider along its length. This allows the sound to be amplified and travel some distance.This is the basis of the tapered quarter wave pipe, a new look at the Voigt Pipe. This DIY guide Includes the trickest crossover, with formula and layouts.Build this loudspeaker and be astounded at how good they sound with midrange clarity and a soundstage wider than the speakers themselves. Ideal for small rooms where space is at a premium. Includes free software and plans.