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We have the capability to measure many different types of loudspeaker systems. Some are intended to be very directional, such as line arrays. Others are intended to be omni-directional (no directivity control), such as a dodecahedron loudspeaker.

We can also measure using different techniques. Measuring each pass band (i.e. LF and HF) separately allows the crossover filters to applied to the measured loudspeaker data in post processing. If the crossover filters are changes it is a simple matter to apply the new filters. There is no need to remeasure the loudspeaker data, as it has not changed.

Three-way Loudspeaker

Each pass band (LF, MF, and HF) was measured separately using no crossover fitlers or EQ. A GLL was created and used to design the crossover. This enabled the directivity through the crossover regions to be optimized. Passive crossover fitlers were then designed for this loudspeaker system.

Three-way Loudspeaker
CGD, Custom Home Theater LCR (prototype)
Line Array Loudspeaker (Module)

Both pass bands (LF and HF) were measured separately using no crossover filters. A full-range measurement was also made using the DSP-based crossover filters and EQ from the manufacturer. This allowed a comparison of the measured full-range data to the response calculated by a GLL using the seperate pass band measurement data and the externally applied crossover filters.

Line Array Loudspeaker
Clair Global, Cohesion 12 (CO-12)
Dodecahedron Loudspeaker

Both pass bands (LF and HF) were measured separately using no crossover filters. A GLL was created and used to investigate the directivity response using different crossover frequencies and different crossover filter slopes.

Dodecahedron Loudspeaker
Acoustical Design Collaborative, Custom Dodecahedron
Curved Column Line Array Loudspeaker

A single LF and single HF driver in this loudspeaker were measured separately, without any crossover filters. The data from these measurements were used to place multiple, virtual "drivers" in a GLL at the proper locations to accurately represent the 12 HF drivers and the 8 LF drivers. Measurements of the passive crossover filters were also used in the GLL.

Curved Column Line Array Loudspeaker
Christie Digital, LA2

The GLL created from the single driver measurements and the passive crossover filter measurements calculates the combined directivity response of the loudspeaker. This is the directivity balloon at 1 kHz.

Directivity Balloon
Directivity balloon at 1 kHz for Christie Digital, LA2 loudspeaker
Large Two-way Loudspeaker

A full-range measurement was made using the DSP-based crossover filters and EQ from the manufacturer.

Large Two-way Loudspeaker
Clair Global, P-2
Column Loudspeaker

A full-range measurement was made using the passive crossover in the three-way loudspeaker system.

Column Loudspeaker
SoundTube, LA880i
Small Two-Way Loudspeaker

A full-range measurement was made using the passive crossover in the two-way loudspeaker system.

Small Two-Way Loudspeaker
Extron, SM28
Excelsior Audio (704) 675-5435 info @ excelsior-audio.com