AUDAC WMM450 – Fire-Rated Metal Back Box for Flush-Mount Speakers is backordered and will ship as soon as it is back in stock.
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What is the AUDAC WMM450 back box?
The AUDAC WMM450 is a fire-rated, powder-coated steel back box for in-ceiling and in-wall speakers mounted in hollow structures. It gives the speaker a closed 15-liter enclosure lined with acoustic damping wool, which keeps sound from leaking into the room next door. It fits AUDAC CELO, CENA, CIRA and MERO flush-mount speakers.
What does the AUDAC WMM450 back box do?

The WMM450 mounts above the ceiling or inside the wall cavity, and the speaker installs through it from the room side. Its 15-liter internal volume matches what AUDAC recommends for the open-back CELO and MERO series, so low-frequency response holds up. The steel shell meets fire-rated ceiling requirements, and the damping wool absorbs back-wave energy. Use it in offices, hotel rooms and meeting rooms where sound isolation or fire code applies. Compatible speakers include the CELO8I/W, CELO8SI/W, MERO5 and MERO6. For a non-fire-rated option, see the WMM630 MDF back box.
What are the key features of the AUDAC WMM450 back box?
- Fire rated — powder-coated steel for fire-rated ceilings and walls.
- 15-liter volume — matches AUDAC's recommended back volume for CELO and MERO speakers.
- Acoustic damping wool — lining absorbs back-wave energy.
- Sound isolation — limits sound leaking into adjacent rooms.
- Broad compatibility — fits CELO2/5/6/8/8S, CENA3/5/7/8, CIRA5/7/8 and MERO2/5/6.
- Warranty — backed by a 5-year AUDAC manufacturer warranty.
Technical Specifications
| Model | WMM450 |
| Dimensions | 446 x 455 x 127 mm (W x H x D) |
| Construction | Powder-coated steel |
| Internal volume | 15 liters |
| Inner finish | Acoustic damping wool |
| Compatible speakers | CELO2, CELO5, CELO6, CELO8, CELO8S, CENA3, CENA5, CENA7, CENA8, CIRA5, CIRA7, CIRA8, MERO2, MERO5, MERO6 |
| Warranty | 5 years |
At Creation Networks, we do everything we can to create an excellent customer experience. This includes fast shipping and easy returns.
- Most in-stock orders placed Monday-Friday ship within 24-48 hours. General restrictions apply; please see our full shipping policy here.
- We offer a 30-day return policy from the delivery date on many products. Product restrictions apply. Restocking fees for the return of open-box items. Please see our full return policy here for more information.
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