RE: amp - long cable - speaker = hum/noise?

["Andrew Koenig" <ark@acm.org>]

> he complaints about the long cables on this equation:
> 
> amp - long cable - speaker = noise+hum ?
> 
> he asked if inserting some kind of inject box between the amp and the
> speaker will solve the problem.

I would be very surprised if a cable between a speaker and an amplifier
could pick up significant hum.  I'd suggest proving that that is what is
happening before looking for the cause.