Crossover-Mania A Tale of Two Timings System configuration used for these measurements (No acoustic elements) EQ  DelayPolarity   X-Over Sum Input (Ref) Output (Meas) Hi Lo

EQ  DelayPolarity   0 ms 24 dB/oct L-R Sum Input (Ref) Output (Meas) Hi Lo 1 kHz 0 ms X-Over Symmetrical Crossover: 24 dB/oct L-R at 1kHz L-R Low-Pass L-R High-Pass Sum: Low-Pass + High-Pass Overlapping phase traces through crossover L-R filters –6dB at xover Perfect summation through xover Two crossover filters measured separately. Two crossover filters summed back together

EQ  DelayPolarity   0 ms 24 dB/oct L-R Sum Input (Ref) Output (Meas) Hi Lo 1 kHz 0 ms X-Over Filter Impulse Responses: Linear Views High-Pass Filter Low-Pass Filter HPF Peak LPF Peak Note: If you simply used the AutoSm or Lg Impulse Resp measurements to measure the “driver” arrival times, you would be given the peak arrival times – and the peak of the LF is.5ms behind that of the HF.

EQ  DelayPolarity   0 ms 24 dB/oct L-R Sum Input (Ref) Output (Meas) Hi Lo 1 kHz 0 ms X-Over Filter Impulse Responses: Log & ETC Views ETC: High-Pass Filter ETC: Low-Pass Filter HPF Peak LPF Peak Log View

EQ  DelayPolarity   0.5 ms 24 dB/oct L-R Sum Input (Ref) Output (Meas) Hi Lo 1 kHz 0 ms X-Over High-Pass Filter Low-Pass Filter Delay Added to High Filter to Align Peaks in Time

EQ  Polarity   24 dB/oct L-R Sum Input (Ref) Output (Meas) Hi Lo 1 kHz X-Over L-R Low-Pass L-R High-Pass Sum: Low-Pass + High-Pass Phase traces 180 ° out at crossover Cancellation at xover! Adjusted Timing Causes Cancellation at Crossover Delay 0.5 ms 0 ms

EQ  Polarity   24 dB/oct L-R Sum Input (Ref) Output (Meas) Hi Lo 1 kHz X-Over Inverting Polarity of Low Filter Shifts Phase Trace 180° Phase traces 180 ° out at crossover Phase traces in phase at crossover Delay 0.5 ms 0 ms

EQ  24 dB/oct L-R Sum Input (Ref) Output (Meas) Hi Lo 1 kHz X-Over The Result is Addition Through Crossover Addition at crossover not “perfect” Polarity   Delay 0.5 ms 0 ms

EQ  24 dB/oct L-R Sum Input (Ref) Output (Meas) Hi Lo 1 kHz X-Over Addition at crossover not “perfect” EQ Applied to Flatten Response at Crossover EQ improves magnitude and phase responses Polarity   Delay 0.5 ms 0 ms

Comparison of Two Alignments