A:Answer Hi,
Thank you for your question. The VP85W woofer does not require a pre-construction bracket or backbox for new or retrofit installations.
I hope you found this information helpful. If you have additional questions, please feel free to call our California-based support team at 949-492-7777 and ask for Tech Support. We are available Monday - Friday, 8 AM to 5 PM PST. We'd love to help you out.
- Sonance Customer Support Team