The MTC-81BB8 is designed for use in applications requiring preinstalled backcans and is compatible with ceiling speakers having a 286 mm (11.25 in) mounting circle diameter, such as the JBL 8138 ceiling loudspeaker, and the JBL MTC-81TB8 tile bridge for suspended ceilings.
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| 内部音量 | 7.4 liters (0.26 cu ft) |
| 敲落孔 | 22 mm (0.87 in) diameter opening |
| Five (5) locations | 4 on side of can1 on top of panel of can |
| Suspension Tabs | 2 flexible perforated mounting straps, one on each side. |
| 结合点 | 4 clip-nuts on 286 mm (11.25 in) mounting circle fix M4 tapping screws for attaching tile bridge to backcan, plus 4 thru holes providing clearance for screws from speaker to attach to tile bridge (see assembly drawing). |
| 材料 | 16 gauge (1.3 mm thick) steel, finished in black polymer E-coating for a high level of rust resistance. |
| 尺寸（高 x 宽 x 厚） | 178 mm (7 in) height x 300 mm (11.75 in) width and depth |
| Net Weight (each) | 1.1 kg (2.5 lbs) |
| Shipping Weight (ea) | 1.5 kg (3.2 lbs) |
| Associated Models | 8138 200 mm (8 in) ceiling speakerMTC-81TB8 tile bridge for 600 mm (24 in) ceiling tile applications. |
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