audio quality bad, although example-wav good

[diaphon]

Hi! I'm trying to send my .wav-file* (which plays clearly on the jack-output) to the radio-signal, which works (the example star_wars.wav-file plays good), but I get disturbed sound on the radio: sounds distorted with noise. sudo /home/pi/radio/fm_transmitter -f 94.0 -r /home/pi/sounds/sound.wav I allready tried to pipe it with: sox /home/pi/sounds/sound.wav -r 22050 -c 1 -b 16 -t wav - | sudo /home/pi/radio/fm_transmitter -f 94.0 - But this doesn't improve it. I also tried it with omxplayer and aplay, both on RPi2 and RPi3. I also tried to convert the file with media.io as KDragonM mentioned.

• Info of my .wav-file:

  > soxi /home/pi/sounds/sound.wav 
  Input File     : '/home/pi/sounds/sound.wav'
  Channels       : 1
  Sample Rate    : 22050
  Precision      : 16-bit
  Duration       : 00:09:19.72 = 12341904 samples ~ 41979.3 CDDA sectors
  File Size      : 24.7M
  Bit Rate       : 353k
  Sample Encoding: 16-bit Signed Integer PCM

Please help me, get -more or less- clean radio-signal of my .wav-file! (Like I said, star_wars.wav plays good.)

• Info of the star_wars.wav:

  > soxi /home/pi/radio/star_wars.wav 
  Input File     : '/home/pi/radio/star_wars.wav'
  Channels       : 1
  Sample Rate    : 22050
  Precision      : 16-bit
  Duration       : 00:02:20.00 = 3087000 samples ~ 10500 CDDA sectors
  File Size      : 6.17M
  Bit Rate       : 353k
  Sample Encoding: 16-bit Signed Integer PCM

[diaphon]

@supersambo solved my problem: My audio-file was simply too quiet. The -v 10 solved the quality-issue:

sox -v 10 sound.wav -r 22050 -c 1 -b 16 -t wav - | sudo ./fm_transmitter -f 94.0 -

thanks @supersambo