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