phase-corrected cross-over network

elektor electronics december 1985 Zero phase shift between the drive units in an active loudspeaker unit has been the goal of virtually all designers and constructors ever since the first multiple speaker unit was conceived. For a long time, it has been like trying to achieve a perpetuum mobile, but now it has become reality! phase-corrected cross-over filter by T Scherer It is well known that the loudspeaker is the weakest link in an hi-fi chain: it is the final factor that determines how the hi-fi instal- lation sounds. The most serious problem is that presented by the processing of the wide range of frequencies. As long ago as the thirties, designers have tried to solve this problem by sub-dividing the audible fre- quency range and using a separate drive unit for each of the resulting bands. In the simplest case, this means that a bass speaker (woofer) is used for the low audio frequencies, and a so-called tweeter for the high audio frequencies. Right up to the 1960s, the netwo...