In article , tony sayer

wrote:

I remember seeing some being tested at the factory once and they were
fed with a square wave and the output on the scope from the B&K Mic was
.. well .. very square..

I've also seen that. Also that they would drive two ESLs in antiphase to
check they could null the two outputs at the mic to confirm the two
speakers were near identical in performance. Never seen that with any other
speaker outside an anechoic chamber. They did it in the open factory when I
was there.

Slainte,

Jim

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