For those looking to disable the bluetooth and the built in audio here is a small guide
Disabling rpi3 bluetooth
Here is a link that walks you through disabling rpi3 bluetooth.
Note: you will either need to use the mouse and keyboard or connect to it remotely with SSH:
http://raspberrypi.stackexchange.com/a/53369
Disabling in built in audio using raspi-config
Built in audio can be disabled using ‚raspi-config‘.
You will need to install it as root or using sudo: (it might already be installed)
# sudo apt-get install raspi-config
Walk through the menus and it should have an option for this.
Disabling built in audio card using command line
Here is a link
http://www.instructables.com/id/Disable-the-Built-in-Sound-Card-of-Raspberry-Pi/step2/Configure-Linux-to-NOT-load-Broadcoms-sound-chip/
It’s pretty straight forward.
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