The Stereophile NHT test available online. Here is the linear phase crossover related pre-ringing and on axis cancellation I was talking about.
NHT XdS driven by XdA, step responses on tweeter axis at 50" of equalized tweeter (red) and woofer (blue). (5ms time window, 30kHz bandwidth.)
NHT XdS driven by XdA, equalized step response on tweeter axis at 50" (5ms time window, 30kHz bandwidth).
