If you have horns and woofers the problem is to where to place the horn fore and aft to get the best performance . With electronic XOs the question is how do I set the woofer time delay? With coaxial speakers ( Altec 604 and 605 ) how do I build an XO with the proper woofer time delay?
The technique developed to use this Test Signal gives results down to the 50 uSec level.
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