Why does my FM Transmitter provide muffled sound or poor fidelity?
The input level control on the side of the FM Transmitter is probably set too high. The FM Transmitter “overloads” very easily, and this will cause muffled, harsh, and distorted audio. Set the input level control so that the LED on the unit just barely glows or flashes, and then back it off just a little. If the gain is set any higher than that, for instance the LED flashes brightly or stays on, then the unit is overloading. This causes not only poor audio quality, but is also splattering its signal all over the band. Also, if the level is set too low, the signal will be mixed with noise and hash,as well as suffering from limited transmitting range. Worse case will be a carrier signal (a quiet spot on the receiver), but no audio.
