The Teufel serial number is usually affixed to the field labeled S/N.
You can always find this sticker on the field with the product name, which we have placed on the product packaging and often on the product itself as well.
For larger devices, the field with the serial number is usually located on the back—often near the connections. Here, on the CONCEPT 8 subwoofer (image, red arrow)
For portable devices, such as the BOOMSTER (see image), the serial number may also be located on the bottom.
For headphones, the sticker is on the outside of the box.
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