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Loudspeakers are often classified as "N-way", where N is the number of drivers in the system. For instance, a loudspeaker with a woofer and a tweeter is a 2-way loudspeaker system. An N-way loudspeaker usually has an N-way crossover to divide the signal among the drivers. A 2-way crossover consists of a low-pass and a high-pass filter.
A 'starter' version, the B-300, was a 2-way system consisting of one 12" woofer and one tweeter pair mounted across the front of the woofer. A single capacitor sufficed as the crossover 'network' for the B-300. The system could be expanded to a 3-way B-302A by adding a midrange and full 3-way Bozak crossover.
Nearly all crossovers are passive circuits, designed to match the characteristics of the drivers and their mounting, and are built of capacitors, inductors, and resistors. Active or 'electronic' crossovers are used in some high performance hi-fi speakers, and in professional sound reinforcement systems .
The NS-2000 was later replaced by the smaller NS-1000x, which has a smaller woofer and similar but different-model beryllium-dome midrange drivers and tweeters. A limited issue walnut-veneered version of the NS-1000x, called the NS-1000xw, looks more similar to the NS-2000 than the standard black NS-1000x does.
In 1975 Ed Long [1] in cooperation with Ronald J. Wickersham invented the first technique to Time-Align a loudspeaker systems. In 1976 Long presented "A Time-Align Technique for Loudspeakers System Design" [2] at the 54th AES convention demonstrating the use of the Time-Align generator to design improved crossover networks for multi-way loudspeakers systems.
The midwoofer-tweeter-midwoofer loudspeaker configuration (called MTM, for short) was a design arrangement from the late 1960s that suffered from serious lobing issues that prevented its popularity until it was perfected by Joseph D'Appolito as a way of correcting the inherent lobe tilting of a typical mid-tweeter (MT) configuration, at the crossover frequency, unless time-aligned. [1]
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