SIRIUS XDRC2UG - Manual (Page 43)

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11 The audio level output of the Xpress RC i can be increased or
decreased as necessary to match the audio levels of other sources
in your vehicle . Refer to “Set Audio Level” on page 97 .
If the signal reception is good, but there is no audio when tuned to channel 1,
be sure the vehicle’s stereo system is set to the correct source, i .e ., auxiliary
input source (step 9) . Also be sure that the FM Transmitter is turned Off (step
7), and that the audio level is set high enough to be heard (step 11) . Refer to
“Troubleshooting” on page 110 for additional help .