RE: Dumb question - PC Audio connection?

["Brown, Andy [Infrastructure]" <andyb@xxxxxxx>]

I've got this setup on my MP3 PC.  Two outputs coming from two dedicated
MP3
player dongles, both feeding into my amp via a passive mixer (basically two
resisters Keith describes).

Works well.

Andy

-----Original Message-----
From: Keith Doxey [mailto:ukha.diyha@xxxxxxx]
Sent: 08 February 2001 23:06
To: ukha_d@xxxxxxx
Subject: RE: [ukha_d] Dumb question - PC Audio connection?


As per my previous answer, the output level isnt a problem, the amp will
handle that and you can always turn down the PC volume.

The problem comes from the low output impedance of modern audio equipment.
It is often near zero impedance so looking into the output of a soundcard
or
CD player you effectivly see a short circuit to ground. This will severely
attenuate the output of a parallel connected device.

By using the 1K resistors the output of each PC will be attenuated by 3dB
but if it ends up too low (which is unlikely) just increase the output from
the PC.

Keith

> -----Original Message-----
> From: Phillip Harris [mailto:phillip.harris1@xxxxxxx]
> Sent: 08 February 2001 22:48
> To: ukha_d@xxxxxxx
> Subject: RE: [ukha_d] Dumb question - PC Audio connection?
>
>
>
> Isn't this going to cut out half the audio waveform and anything below
0.7
> volts?
>
> Just hooking two audio sources to one input is going to do nothing
worse
> than (possibly) overdrive the input by a maximum of 3db surely?
>
> Phil
>
> > -----Original Message-----
> > From: Paul Miller [mailto:pmiller@xxxxxxx]
> > Sent: 08 February 2001 22:32
> > To: ukha_d@xxxxxxx
> > Subject: RE: [ukha_d] Dumb question - PC Audio connection?
> >
> >
> > Why not to be safe just solder two signal diodes in place.
> >
> >                 diode
> > from PC 1 -------===----\
> >                           \
> >                           ---------- To AMP
> >                 diode     /
> > from PC 2 -------===----/
> >
> > Like above, I hate ASCII pictures..
> >
> > Paul
> >
> > -----Original Message-----
> > From: Paul Gordon [mailto:paul_gordon@xxxxxxx]
> > Sent: 07 February 2001 12:12
> > To: ukha_d@xxxxxxx
> > Subject: [ukha_d] Dumb question - PC Audio connection?
> >
> >
> > This is a bit basic I know, but here goes...
> >
> > Is there any reason why I shouldn't connect 2 seperate PC's
> > audio-out to the
> > SAME input on an amplifier?
> >
> > Reason:
> >
> > I currently have 2 audio-enabled PC's in the cellar, one is my HA
PC,
> > running Homeseer 24/7. The audio out is connected to an old amp
which is
> > also in the cellar, which drives 4 speakers dotted around the
> > house for TTS
> > announcements only. The other PC is my "Entertainment"
PC, (MP3 jukebox,
> > games console, Web-TV etc), which is connected to an input on the
home
> > cinema amp in the lounge.
> >
> > I do have a long-term plan to (possibly*) merge these 2 PC's into
> > 1, but not
> > until all the issues with Homeseer phone running under Win2K are
> > resolved, -
> > my entertainment PC currently runs W2K, and I will >NOT<
downgrade it to
> > Win9X, also, I don't want to merge them until I can also do a
> > processor U/G
> > on the target PC.
> >
> > * I still "prefer" to keep these functions seperate,
however,
> it does make
> > it loads more difficult for the HA PC to control the
> entertainment PC. If
> > all this was on the same machine, it makes controlling the
> > various software
> > components a bit easier...
> >
> > However, I would like to merge the audio from these 2 sources, so
> > that I can
> > treat all the speakers around the house as a single distributed
> > system, - I
> > find that I need this for parties, as I can easily drive some
> speakers in
> > the garden from the HA PC's cellar-based amp, but not so easily
from the
> > home cinema amp... It also makes it better/easier to deal with
Homeseer
> > announcements when the entertainment PC is playing music...
(sometimes
> > difficult to hear the announcement, can't get the announcements
over ALL
> > speakers in the house etc.)
> >
> > I had thought about just getting a Y cable, and connecting both
PC's
> > soundcards line-out to the same input on the lounge amplifier..
> > would there
> > be any problem with doing this?
> >
> > Cheers.
> >
> > Paul G.
> >
> >
>
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