Making an audio filter affect some, but not all, audio sources?

I am creating a racing game for mobile. Whenever the player's car enters a tunnel or other enclosed area, an audio echo filter attached to the audio listener object activates. Unfortunately, this echo filter also causes the music to echo. Is there a way to make the filter ignore certain audio sources only? (My other option would to be to attach audio filters to the hundreds of audio sources that do need to echo).