- Extra-thick 16 gauge metal construction.
- Lined with 12 mm (½ inch) thick MDF to eliminate resonances and to provide extra bass response.
- Knockouts on top and side.
| JBL | CONTROL CONTRACTOR | MTC-300BB8 | BACKBOX FOR 8″ C300 | China |
| External Volume | 1 cu ft., nominal |
| Internal Volume | .71 cu ft. |
| Knockouts | 22.1 mm (0.87 in) diameter openingFive (5) locations: 1 on top panel4 on side of can |
| Height | 259 mm (10.2 in) above ceiling268 mm (10.6 in) total height |
| Outside diameter | 380 mm (15.0 in) |
| Inside Diameter | 273 mm (10.7 in) |
| Ceiling Cutout Size | 310 mm (12.2 in) |
| Safety Agency Rating | Suitable for use in air handling spaces, perU.L.-2043, U.L.-1480, NFPA90 & NFPA70A |
| Net Weight | 5.2 kg (11.5 lbs) |
| Shipping Weight | 7.9 kg (16.5 lbs) |
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