Re: Noise from amplifiers

"Wayne T" <[EMAIL PROTECTED]> wrote in message
news:[EMAIL PROTECTED]
> Recently bought demo YBA 3A equipment, preamp plus monoblocks plus
Spendor
> S9 speakers.  Have noticed some noise coming thru speakers when amps
are on
> and volume turned all the way down.  However, don't notice the noise
when I
> play music.  The place that sold me this equipment tells me that
some noise
> is normal with high end high wattage equipment, each amp is 100 W.
Does
> anyone know if this is true?

It's not the power output rating that counts; it's the voltage gain
(which you may or may not know) and the sensitivity of the speakers.
The speaker sensitivity and impedance, along with the voltage required
at the input of the amplifier to produce 100W into that impedance,
will allow you to determine whether the noise you hear is reasonable,
given the laws of physics.

Norm Strong