There is another way. I connected to a different wireless network that didn't require the MAC address and once it was connected, all pertinent networking info, including the MAC address, was displayed.
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We appreciate your interest in this Home Theater System. The MAC Address will be available through only one of two methods. First, it may be listed on a label on the back of the system itself. If this turns out to not be the case, however, and since the listing is not readily available through the menu, the only way to get it will be to turn off the network restrictions to locate the MAC Address, add it to your system, and then reactivate the security settings.
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