Is AirPlay limited to 16 bit 44.1 kHz over an apple express modem?

Trying to determine if iTunes / AirPlay is limited to 16/44.1
When using a newer version Apple express modem?

The music being passed through the Airport Express is data. The output of the Apple TV, or whatever device connects to your speakers is determind by the hardware of that device.
If you output audio from the Airport Express using the audio out feature, then it would be up to the receiver.

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