Hummer 2006 H2 Owner's Manual page 231

Audio Output
Audio from the DVD player or auxiliary devices can be
heard through the vehicle speakers or the wireless/wired
headphones. The FM Modulator control has to be set
to one of eight frequencies in order for these devices to
be heard through the vehicle's speakers. See "FM
Modulator Control" later in this section.
Vehicle Speakers
Only one audio source can be heard through the
vehicle's speakers at a time. The audio source to be
reproduced is specified by the A/V source selected on
the driver's side head restraint monitor.
The RSE system or an auxiliary device can be heard
through all of the vehicle's speakers when a DVD
or auxiliary device is playing and the radio is tuned
to one of eight frequencies selected on the FM
Modulator controller.
To turn the RSE system audio output to the vehicle's
speakers, on or off, press the POWER button on the FM
Modulator Controller. The audio from the RSE system
can be heard through the wireless/wired headphones
and the vehicle's speakers at the same time. The
volume on the radio may vary when switching between
the radio, CD, DVD, MP3, or an auxiliary device.
Video Screens
The video screens are located on the backside of each
head restraint.
Notice: Avoid directly touching the video screen,
as damage may occur. See "Cleaning the Video
Screens" later in this section for more information.
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