I beleive in http://gedlee.com ~ waveguide theory. check out the summa pdf. I think I buy the books & program as well. ...Doppler distortion should be real bad/articulated then with Tannoy dual concentric speakers, which apparently using the bass cone as waveguide, opposed to the Altec 604, which suffers because the horn in the middle shades the cone. I wont trade the JBL woofers for anything else, just try to simulate the 2235h in winisd ;D