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<blockquote data-quote="rbf1138" data-source="post: 6809680" data-attributes="member: 622089">Thanks for the detailed reply. A couple points of clarification:By on/off switch, I just meant, I can flip it so that when I&#039;m tuned to 89.1 it uses the modular signal, or I can flip it so that it functions normally with the radio frequency.I&#039;m sure it is not an audio issue, as I&#039;ve tried it with a player I have with lossless files and a direct line-out. Fortunately, I know enough about audio to know that this isn&#039;t an issue of bitrate, or even distortion from clipping due to volume levels.It really seems that I can isolate the distortion to certain parts or sounds in the various tracks I&#039;ve tried. Like I said, with Radiohead, sometimes the distortion seems focused right on the vocals, no matter how loud the volume is turned up or down.&nbsp; It&#039;ll be totally clear and then a new instrument will come in, or new sound, and then I&#039;ll get crackling that seems isolated to that particular voice/instrument.I have had a Sirius radio installed for several years, and I do not have a problem with it. It also uses a wired fm mod.It sounds like it&#039;s probably an issue with the ground noise, or that the mod doesnt have enough power to handle the input and gets overwhelmed when the music gets more complex, in a sense?</blockquote>

[QUOTE="rbf1138, post: 6809680, member: 622089"] Thanks for the detailed reply. A couple points of clarification: By on/off switch, I just meant, I can flip it so that when I'm tuned to 89.1 it uses the modular signal, or I can flip it so that it functions normally with the radio frequency. I'm sure it is not an audio issue, as I've tried it with a player I have with lossless files and a direct line-out. Fortunately, I know enough about audio to know that this isn't an issue of bitrate, or even distortion from clipping due to volume levels. It really seems that I can isolate the distortion to certain parts or sounds in the various tracks I've tried. Like I said, with Radiohead, sometimes the distortion seems focused right on the vocals, no matter how loud the volume is turned up or down. It'll be totally clear and then a new instrument will come in, or new sound, and then I'll get crackling that seems isolated to that particular voice/instrument. I have had a Sirius radio installed for several years, and I do not have a problem with it. It also uses a wired fm mod. It sounds like it's probably an issue with the ground noise, or that the mod doesnt have enough power to handle the input and gets overwhelmed when the music gets more complex, in a sense? [/QUOTE]

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