"Jim Lesurf" wrote in message
...
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.



How is that so hard - I would expect that with Lowthers?