Econowave speaker project via audiokarma.org
According to designer Zilch (RIP), “eWave is a pre-engineered high-frequency ‘module’ for building 2-ways comprising an inexpensive compression driver, modern constant-directivity waveguide, and a crossover incorporating the requisite compensation. Mate it with any woofer and cabinet of your choice which will play competently through its 1.6 kHz crossover region. The builder is responsible for optimizing the lowpass filter for the specific combination they use; a generic one is suggested as a starting point, and many have found that to be adequate for constructing a successful project….”
Essentially, the eWave setup replaces the original crossover — and the old tweeters and midranges with a single, horn high-range driver — and brings high-end, modern sound to vintage cabinets with original woofers.