On Tue, 25 May 2010 02:30:29 +0000, Paul G. wrote:

Probably a guess, but I suspect the mystery part is a high value
resistor as Phil stated. Its purpose is for "leaking" any DC static

And Paul G wins the contest!

Go claim your prize, a date with Phil Allison.

The resistor is there to protect the amplifier from static discharge.
Said static could build up while wiring up the speakers or even after
they are wired scooting them around on the carpet.