Measurement and Testing of Acoustic Research Drivers

[RobHolt]

RobHolt submitted a new article:

Measurement and Testing of Acoustic Research Drivers - Measurement and Testing of Acoustic Research Drivers

As mentioned elsewhere I'm rebuilding a pair of AR4xa but using the later drivers from 1979/80 as used in the AR17/18.

In the process I've been taking lots of measurements and thought I'd share them here along with a few observations.

Effectively I have the original 4xa coated cloth surround woofer dated Nov 1972, a 1980 build of the 'universal' made in USA woofer as used in the AR18 (200001-1), and a 1982 version of the outwardly similar unit as used in the 18S (200037-0). The latter two...

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