Okay, here we go.
Both your sound card and your triple talk have similar small chip amplifiers
that are, essentially, current pumps. When you put two of them pumping to
the same output, electronically speaking, they see each other and the
impedance, (resistance) of the circuit changes significantly for both
amplifiers and their output will change accordingly. As two things are
never exactly the same, one will tend to dominate and the other be
suppressed.
The solution is to isolate the two audio output streams. If you don't,
eventually you risk burning out one of the amplifier chips.
If you have the skill you could create a small circuit board and isolate the
two output circuits from each other with, probably 10K resistors.
If you don't have the skill, then purchase a very low-cost mixer and put
both channels into it and feed a small amplifier. Some mixers actually come
with an earphone amplifier built into them.
I can't make a recommendation, as the mixer I own is overkill and costs
about $200. I would bet with a little hunting you can find something for
less than 50.
Perhaps somebody here on the list can make a mixer recommendation.
Jeff
-----Original Message-----
From: john schwery
Sent: Tuesday, November 20, 2012 9:29 AM
To: [email protected]
Subject: mixer?
I posted earlier that I have volume problems with my system. I am
using a PCI triple talk synth and my system volume is drowning out
the volume of my synth. I have my system and my synth running to a y
cord to my headphones. Should I get a sound mixer, and if so, which
mixer. Or, should I get a pre-amp for my synth. I need 2 headphone
level inputs going to a headphone output. I would like volumes on
both inputs and also a volume on the output. Thanks for any help.
John
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