I wired in my music input/output to my intercom today. I plugged in my MP3 player and it worked fine--except---the only volume control is on the MP3 player. The intercom volume control is separate and for voice only. Now the question. The volume from the player isn't really sufficient. Not bad when on the ground and everything is quiet but not nearly loud enough to hear well when in flight. Suggestions?

Greg,

 

Most aviation audio inputs are 600 ohms while most modern device headset or line outputs are for 4 or 8 ohms.  If your intercom is modern enough to have stereo inputs, check the specifications documentation.  If you are using an aviation input, it will expect the higher impedance. 

 

If the intercom is monaural, you can get various conversion plugs (stereo to monaural) from radio shack, including those that would go into the intercom mike plug - this would give you a chance to see if the intercom volume control would have any useful effect.  Perhaps your intercom is set up to accept more passenger inputs than you have seats in the plane.

 

You can try to find impedance matching transformers that may solve your problem or a small pre-amp with a vol control would do the job.