Possible simpler solution...

See if your player has a "line out" jack. If so, just put your plug from
your audio panel in that jack as it is properly impedance matched.

Although I have never seen one, you may have a "line out" jack that is
labeled differently. Check your units instructions and see if it provides a
way to hook it into your home stereo. If it does, connect to the jack shown
in those instructions.




"Mike Murdock" wrote in message
...
The problem is an impedance mismatch between your MP3 player's output and
the GMA340's music input. This website:

http://www.fremarllc.com/accessories/index.html

has an adapter that will fix the problem and allow you to get full volume.
On the web page, scroll down to "Stereo music impedance adapter"

Regards,

-Mike Murdock


"O. Sami Saydjari" wrote in message
...
I have a Garmin 340 panel and the installer put a music input jack for
it.
So, I tried plugging my portable MP3 player output into the music jack.
At
maximum volume on the MP3 player, the music was almost completely
inaudible. Does the signal need to be pre amplified in some way, or did
the installer mess something up?

-Sami
N2057M, Piper Turbo Arrow III