That is extremely important in order to maintain delays between {TAIL ~ channels} measured during {HEAD ~ factory calibration}, especially when a channel combining technique is used, such as that set forth in U.S. Pat 
That is extremely important in order to maintain delays between { TAIL ~ channels } measured during { HEAD ~ factory calibration } , especially when a channel combining technique is used , such as that set forth in U.S. Pat
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH