Of course it's the amp. It's obviously not the speakers, because they
aren't capable of generating noise (or any sound) on your own. It
can't be a problem with the Furman or anything upstream of it, because
if it were then the noise would appear in the self-powered Event
speakers as well. The Hafler is the only noise-generating device that
is common to the Yamaha and RS speakers and missing from the Event
speakers. Right? Right.

ulysses


In article , jim helman
wrote:

Hi all,

I switch between 3 monitors via a Furman SRM-80.

Event 20/20 bas
Yamaha NS10m
Radio Shack RCA cubes.

The power amplifier is a Hafler P230. (16 years old)

There is a very noticable hiss when listening to the NS10's or the
RCA cubes.
The Event's are quiet.
This leads me to believe that the Furman switcher is not introducing
the hiss, but the combination
of Hafler P230 and the passive speakers is at fault.

Does anyone have any thoughts on this? Do NS10m's always have hiss?

Thanks in advance.
Jim