How do you hook up external sound card to PS3?

To connect an external sound card to a PS3, you would typically use the USB port on the console. Simply plug the sound card into one of the available USB ports on the PS3. Then, navigate to the PS3's XMB (cross-media bar), go to "Settings," select "Accessory Settings," and choose "Audio Device Settings" to select the external sound card as the audio output device. Make sure your sound card is compatible and properly configured for use with the PS3.