Sunday, June 24, 2007

3. Driver alignment

The next step is driver alignment. Evwn when the drivers are aligned in a straight line on the speakers, the sound from the tweeter and the woofer may arrive to the listerner at different time depending on the height of the speakers and the height of the listerner. Some speaker designer design the speaker such that the tweeter is further back to compensate for this. However, this still does not account for the listerner's height.

Driver Alignment function allows personalization for each listerner based on their head position. The way this is done is to play a sound (logsweep) with a specified delay in time for the tweeter, mid and woofer. So the woofer is played first, the mid follows by 1000ms later and than the tweeter by another 1000ms later. After convolution, you will get the impulse response for all three drivers and the impulse response will be at different position in the time line. Now we just need to measure the distance between the impulse response and subtract the specified delay to get the exact time difference between each drivers.

As you can see from the picture above. The start of each driver can be seen and the distance between gives an indication of how to set the appropriate delay for each driver


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