The Design of Active Crossovers, 2nd Edition

Chapter 13

Time-Delay Filters

The Requirement for Delay Compensation

A lot of discussion on loudspeaker behaviour is based on mathematically simple point sources, but real loudspeaker drive units have a physical size and must be mounted with some space between them. If they are mounted on a flat baffle, as in Figure 13.1, their acoustic centres (the position from which the sound effectively radiates) have different horizontal distances from the baffle position. If we take our listening position as in-line with the tweeter axis, as is usually done, then there is a greater distance from the ear to the mid unit and an even greater one to the bass unit. To minimise the differences, the drive units are normally mounted as close together as physically ...