crossover-mania a tale of two timings system configuration used for these measurements (no acoustic...
TRANSCRIPT
![Page 1: Crossover-Mania A Tale of Two Timings System configuration used for these measurements (No acoustic elements) EQ DelayPolarity X-Over Sum Input](https://reader035.vdocument.in/reader035/viewer/2022070414/5697c0261a28abf838cd5bb5/html5/thumbnails/1.jpg)
Crossover-ManiaA Tale of Two Timings
System configuration used for these measurements(No acoustic elements)
EQ DelayPolarity
X-Over
Sum
Input(Ref)
Output(Meas)
Hi
Lo
![Page 2: Crossover-Mania A Tale of Two Timings System configuration used for these measurements (No acoustic elements) EQ DelayPolarity X-Over Sum Input](https://reader035.vdocument.in/reader035/viewer/2022070414/5697c0261a28abf838cd5bb5/html5/thumbnails/2.jpg)
EQ DelayPolarity
0 ms
24 dB/oct L-R
Sum
Input(Ref)
Output(Meas)
Hi
Lo1 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
![Page 3: Crossover-Mania A Tale of Two Timings System configuration used for these measurements (No acoustic elements) EQ DelayPolarity X-Over Sum Input](https://reader035.vdocument.in/reader035/viewer/2022070414/5697c0261a28abf838cd5bb5/html5/thumbnails/3.jpg)
EQ DelayPolarity
0 ms
24 dB/oct L-R
Sum
Input(Ref)
Output(Meas)
Hi
Lo1 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.
![Page 4: Crossover-Mania A Tale of Two Timings System configuration used for these measurements (No acoustic elements) EQ DelayPolarity X-Over Sum Input](https://reader035.vdocument.in/reader035/viewer/2022070414/5697c0261a28abf838cd5bb5/html5/thumbnails/4.jpg)
EQ DelayPolarity
0 ms
24 dB/oct L-R
Sum
Input(Ref)
Output(Meas)
Hi
Lo1 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
![Page 5: Crossover-Mania A Tale of Two Timings System configuration used for these measurements (No acoustic elements) EQ DelayPolarity X-Over Sum Input](https://reader035.vdocument.in/reader035/viewer/2022070414/5697c0261a28abf838cd5bb5/html5/thumbnails/5.jpg)
EQ DelayPolarity
0.5 ms
24 dB/oct L-R
Sum
Input(Ref)
Output(Meas)
Hi
Lo1 kHz 0 ms
X-Over
High-Pass Filter
Low-Pass Filter
Delay Added to High Filter to Align Peaks in Time
![Page 6: Crossover-Mania A Tale of Two Timings System configuration used for these measurements (No acoustic elements) EQ DelayPolarity X-Over Sum Input](https://reader035.vdocument.in/reader035/viewer/2022070414/5697c0261a28abf838cd5bb5/html5/thumbnails/6.jpg)
EQ Polarity
24 dB/oct L-R
Sum
Input(Ref)
Output(Meas)
Hi
Lo1 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
![Page 7: Crossover-Mania A Tale of Two Timings System configuration used for these measurements (No acoustic elements) EQ DelayPolarity X-Over Sum Input](https://reader035.vdocument.in/reader035/viewer/2022070414/5697c0261a28abf838cd5bb5/html5/thumbnails/7.jpg)
EQ Polarity
24 dB/oct L-R
Sum
Input(Ref)
Output(Meas)
Hi
Lo1 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
![Page 8: Crossover-Mania A Tale of Two Timings System configuration used for these measurements (No acoustic elements) EQ DelayPolarity X-Over Sum Input](https://reader035.vdocument.in/reader035/viewer/2022070414/5697c0261a28abf838cd5bb5/html5/thumbnails/8.jpg)
EQ 24 dB/oct L-R
Sum
Input(Ref)
Output(Meas)
Hi
Lo1 kHz
X-Over
The Result is Addition Through Crossover
Addition at crossover not “perfect”
Polarity
Delay
0.5 ms
0 ms
![Page 9: Crossover-Mania A Tale of Two Timings System configuration used for these measurements (No acoustic elements) EQ DelayPolarity X-Over Sum Input](https://reader035.vdocument.in/reader035/viewer/2022070414/5697c0261a28abf838cd5bb5/html5/thumbnails/9.jpg)
EQ 24 dB/oct L-R
Sum
Input(Ref)
Output(Meas)
Hi
Lo1 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
![Page 10: Crossover-Mania A Tale of Two Timings System configuration used for these measurements (No acoustic elements) EQ DelayPolarity X-Over Sum Input](https://reader035.vdocument.in/reader035/viewer/2022070414/5697c0261a28abf838cd5bb5/html5/thumbnails/10.jpg)
Comparison of Two Alignments
![Page 11: Crossover-Mania A Tale of Two Timings System configuration used for these measurements (No acoustic elements) EQ DelayPolarity X-Over Sum Input](https://reader035.vdocument.in/reader035/viewer/2022070414/5697c0261a28abf838cd5bb5/html5/thumbnails/11.jpg)
![Page 12: Crossover-Mania A Tale of Two Timings System configuration used for these measurements (No acoustic elements) EQ DelayPolarity X-Over Sum Input](https://reader035.vdocument.in/reader035/viewer/2022070414/5697c0261a28abf838cd5bb5/html5/thumbnails/12.jpg)