"Robert Morein" wrote in message
...

"Bret Ludwig" wrote in message
oups.com...

Powell wrote:

A "passive preamp" is no such thing at all. It is a
selector/attenuator, acting as a signal switching
box and a variable signal attenuator.

True, and as a result most outboard devices like
CD players, tuners, etc. lack enough RMS
voltage to adequately drive power amps. Most
mainstream preamps will output 5-50 volts.

Most power amps will go full output with 1.5V rms. VTL in their book
specify they design for input sensitivity of 775 mV as I recall.

Yes, but from practical experience with Sony ES players, I can tell you
that those with 5532 outputs cannot do it cleanly.


In fact NE5532's can drive 7.75 volts into a 500 ohm load with exceptionally
low distortion as shown by the following authoritative reference:

http://www.dself.dsl.pipex.com/ampins/webbop/5532.htm