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Acoustic Research LST

Multi driver loudspeaker system for professional applications.

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Acoustic Research LST


The AR Laboratory Standard Transducer is designed for those laboratory and commercial applications that require conveniently repeatable, accurately known spectral energy profiles, including one flat profile extending from 30Hz to 20 kHz.

The AR LST uses a 12 inch acoustic suspension woofer, four 1 1/2 inch mid range hemispherical radiators and four 3/4 inch hemispherical tweeters.

The individual speakers are identical with those of the AR-3A system. Crossover frequencies are 575 and 5000Hz.


Type: 3 way, 9 driver loudspeaker system

Power Handling: 64W

Crossover Frequency: 575, 5000Hz

Impedance: 4Ω

Sensitivity: 89.5dB

Bass: 1 x 12"

Midrange: 4 x 1.5" hemispherical

Tweeter: 4 x 0.75" hemispherical

Dimensions: 689 x 508 x 248mm

Weight: 40.5kg


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Reviewed Jul 06th, 2015 by andrewparker

My brother has a pair of these, bought new in the 70's. Huge sound, requiring a huge amp. I think he originally ran them on a Phase Linear 700. Anyway, a great speaker. Virtually impossible to find these days. Sigh...



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