A:Answer Hi,
Thanks for your question. For the Sonance R12SUB, the cutout (opening) is 12.97" x 12.97", per the CAD drawing.
A couple of important notes that are easy to miss:
This subwoofer requires the matching in-wall enclosure (R12SUB ENC), which is sold separately.
For your convenience, I’ve included links to the CAD files and Quick Start Guides for both the subwoofer and enclosure below.
Sonance R12SUB Enclosure
Best Buy SKU: 5704008
CAD File: https://images.salsify.com/image/upload/s--MwP-yfQA--/efw3jm168qa1bnnmba90.pdf
Quick Start Guide: https://files.bbystatic.com/DcB4J8rgWv2zDFtPzv1uKQ%3D%3D/505464f5-7024-4ac7-b0b6-ac161a0a4b6f.pdf
Sonance R12SUB
Best Buy SKU: 6253942
CAD File: https://images.salsify.com/image/upload/s--D_vWqpkX--/tg34e3gumgef4orzfhab.pdf
Quick Start Guide: https://files.bbystatic.com/2p4eFtI7SSSytHpfIvZBKA%3D%3D/d93a8533-cb1c-47f8-8202-366d6ea99b1e.pdf
If you’re looking for an in-wall subwoofer that does not require a separate enclosure, take a look at the Sonance VPSUB (Best Buy SKU 6253955). This model has an integrated enclosure, making installation simpler.
I hope you found this information helpful. If you have any additional questions, feel free to reach out to our California-based support team at 949-492-7777. We’re available Monday through Friday, 6 a.m. to 5 p.m. PST, and happy to help!
– Sonance Tech Support Team