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Product code: OSD-NCBI6
For OSD Audio in-wall speakers IW680, IW670 and IW620, this pre-construction bracket is installed during construction or remodeling and before the sheet rock is hung. Easy to install, the
aluminum bracket wings can be stapled, nailed or screwed to studs or joists. These brackets allow you to precisely position where speakers will be installed, and although not required with any of our in-wall speakers, the bracket provides extra support.
Just looking at the dimensions, it appears this bracket might be a tad too large, but I have it in my head that there's a +/- allowance...also unclear if these brackets can support the speakers without drywall or tiles...
here's the speaker dimensions
Plate Width 8-1/2" (216mm)
Plate Height 11" (279mm)
Mounting Cutout Width 7-1/8" (181mm)
Mounting Cutout Height 9-11/16" (246mm)
Mounting Depth 3-7/8" (98mm)
Weight 5lb (2.3kg)
The mounting bracket has a cutout dimension if 7 3/8 which would work but the length is too big at 12 1/2". And based on your description you are planning to mount this with an open back? I do not believe you will get the performance you want if the back side of the speaker is not isolated from the front baffle. Is the ceiling open with the Joists exposed? If so I would suggest building an enclosure with a 1/2" board measuring 18" long by whatever measurement will cover from one side of the Ceiling Joist to the opposite side of the adjacent Ceiling Joist. Then find a piece of a Ceiling Joist matching your Ceiling Joist. Cut two pieces that will fit between the two joists creating the two sides of the box. Mount the two sides so they are 18 apart so the front board will cover them." Use the template that comes along with the speaker and cut out your hole 7 1/8" x 9 11/16". Then mount your front panel to the ceiling. You might want to use some silicon to seal the seams inside the box. Then Google Fiber Fill for loading speaker enclosures. The fiber can be used to tune the cabinet, making the speaker think it is a bigger box. To finish, you can paint the box and speaker to match the ceiling. Of course, your other option with an open ceiling design would be an Indoor/Outdoor patio speaker with a sealed enclosure like our AP650 (also a 2-way 6.5" speaker like your JBL). It's available in Black or White and can paint as well. We sell lots of these for open ceiling layouts at restaurants. I hope that helps answer your question. firstname.lastname@example.org