Mazda 2011 CX-9 Owner's Manual page 334

Operating tips for dts
"DTS" and "DTS Digital Surround" are registered trademarks of Digital Theater Systems,
Inc.
qOperation Tips for Headphones
To listen to audio other than from the speakers of the Rear Entertainment System, it is
necessary to use the wireless headphones that are included.
Specification
Item
Transmission system
Modulation system
Carrier frequency
Rear Entertainment System
Infrared light
Frequency modulation
Right channel 2.8 MHz, left channel 2.3 MHz
Content
Interior Comfort
6-81