JBL MTC-300BB12 Back Box for 12" ceiling Speakers Control 321C, 321CT, 322C, 322CT & 312CS
Features:
Extra-thick 16 gauge metal construction.
Lined with 12 mm (1/2 inch) thick MDF to eliminate resonances and to provide extra bass response.
Knockouts on top and all four sides.
Dual mounting system for baffle.
Specifications:
External Volume: 3 cu ft, nominal
Internal Volume: 2.4 cu ft.
Knockouts: 22.1 mm (0.87 in) diameter opening Five (5) locations: 1 on top panel 1 on each side and end panel
Dimensions (Height): 308 mm (12.1 in) above ceiling 324 mm (12.6 in) total height (Width): 587 mm (23.1 in) (Depth): 461 mm (18.2 in) cabinet 505 mm (19.9 in) including side tabs
Net Weight: 20.6 kg (45.5 lbs)
Shipping Weight: 23.1 kg (51 lbs)
Included Accessories: 4 pcs M4 x 14 mm machine screws for one system of mounting baffle to backbox. 6 pcs #10 x 0.75 inch metal screws for another system of mounting baffle to backbox. 4 pcs M4 nuts for optional transformer mounting