Strong in me The Force is
Car: 2.2 NHB & 1.8 DBP TypeS
Join Date: 18th September 2007
Thanked 57 Times in 48 Posts
These transmitters are mono in the first place.
Moreover, these transmitters vary in quality, even when you build eg. several in exact the same way. It's nice to fiddle with, but certainly not recommended to transmit high quality music signals with. Wired is the way to go, but if FM quality is enough for you, get a decent (stereo-) commercial transmitter.