When Klotz co-ax speaker cable first came out, the rep came to visit us with a sample of the 2.5sq mm version for us to try, as it would fit in XLRs more easily . We noticed that the thickness of the 'screen' (outer conductor) seemed rather less than the inner when soldering up the connectors, so we asked him about it. His response was hysterical!!

I quote: 'Well, the power gets used up by the loudspeaker, so you don't need as thick a wire for the return'...!!

The poor fellow was serious!!! That was around 25 years ago, but it still gives us a laugh! We did get it replaced with the correct stuff, though.

Interestingly, it was once we started using the co-ax speaker cable that some of our Bose 1800 amplifiers (Mk I) began to be randomly unstable. They'd overheat and trip out when in a quiescent state for no apparent reason... we checked the DC offset bias, nowt wrong there... perhaps the capacitance of the cable was a problem.

We didn't get to the bottom of it, but the amps were due for retirement and we've never had such problems with any others.

Recently (since Speakons became the norm) we've reverted to more conventional cable. It coils more easily!