Measurement Environment

The measurement lab at Excelsior Audio utilizes an eighth-space (π/2 steradians) environment for performing loudspeaker measurements. Fiberglass wedges mounted to the trusses above the measurement area control potentially detrimental reflections from the ceiling. This enables us to use an impulse response window about 40 ms long for our measurements resulting in anechoic data with a frequency resolution of about 35 Hz.

Our measurement microphone is located over 6 meters away from the loudspeaker during the measurements. This allows us to measure in the far-field of reasonably large loudspeakers up to very high frequencies.

Measurement Area, Front
Measurement Area, Front
Loudspeaker Rotation

A dual-axis ELF robot from Four Audio is used to rotate the loudspeaker while up to 2,600 individual impulse response measurements that comprise the spherical directivity balloon are carried out. We are able to rotate and measure loudspeakers up to about 200 pounds (90 kg). For loudspeakers exceeding this weight we work with Pro Sound Testing (formerly Electro-Acoustic Testing Company) to carry out the measurements.

We typically perform impulse response measurements at 5 degree increments around the loudspeaker. For many loudspeaker systems this is sufficient to gather the data required for loudspeaker modeling and/or performance specifications. For some loudspeaker designs increased angular resolution is necessary to accurately capture the performance of the loudspeaker in the higher frequency region. We can easily measure at angular resolutions as small as 1 degree when needed.

Measurement Area, Back
Measurement Area, Back
Low Frequency Measurements

When high resolution data are required at low frequencies we are able to measure the on-axis response of loudspeakers in our parking lot. We use an impulse response window a bit longer than 100 ms for these measurements. This yeilds a frequency resolution of approximately 10 to 15 Hz.

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