[John Williamson]

On 09/04/2013 15:39, Gary Eickmeier wrote:
Scott Dorsey wrote:
Gary Eickmeier wrote:

The phase problem has to be at the amplifier, because speakers wired
out of phase just sound funky, but still put out plenty of sound.
But if the leads from the sound card to the amp are out of phase,
then a mono signal would put a perfect null into the amplifier!

Let me guess, you have a 3.5mm jack on the output of the soundcard....
--scott

Yes of course. What choice do I have?

On motherboard sound, probably not a lot.

On various external units here, anything from 3.5mm stereo jacks, to
balanced, +10dbu 14 inch jacks via phonos.

Just a thought, you are using a stereo (TRS) 3.5mm plug, and none of the
connections in the system are shorting the ring to ground? Some
soundcards will mute both channels if either channel is shorted to earth.

And you are, of course, sure that you haven't made my favourite mistake
with 3.5mm socketed sound cards while working upside down with no light
and my head under the desk? You *have* connected the plug to an output? :-)


--
Tciao for Now!

John.