Installation: Existing Construction (retrofitting finished ceilings)
Warning: Exercise caution when drilling into existing ceilings. Do not drill | fig.6 |
through electrical wires, pipes, conduits, heating or air conditioning ducts. If you |
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feel resistance while drilling, stop immediately. Do not install the speaker into a |
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drop ceiling or soft ceiling, as this type of construction will not support its weight. |
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1.Using a studfinder or the “knocking” method, locate the joists in the ceiling area where
you wish to mount the speaker. The speaker will be mounted between adjacent joists, no closer than two inches from either joist.
2. Determine that there are no obstructions above the desired cutout area. This may be accomplished by drilling a hole in the center of the cutout area and using an “L” shaped piece of metal (like a coat hanger) to “feel around” above the ceiling. If you discover an obstruction, fill the hole with patching compound and try another location.
3.If there are no obstructions found above the ceiling, use the supplied cutout template and a pencil to draw a 10” diameter outline of the area to be cut out. Begin by drilling a hole on the inside of the circle with a 1/4” bit. Then cut out the ceiling section with a util- ity knife or keyhole saw, following the line traced around the cutout template (fig.7). If the ceiling is painted, use the keyhole saw. Once installed, the speaker assembly outer frame will extend about 1/2 inch beyond the perimeter of the cutout to hide minor imper- fections in the cutout.
4. If the ceiling is constructed of lath and plaster, outline the penciled circle with masking tape, drill a 1/4” hole, and use a utility knife to cut through the plaster down to the lath. Use a saber saw with a metal cutting blade or a pair of tin snips to gently cut through the lath, being careful not to vibrate plaster off the ceiling.
5.To mount the NHT
bracket is optional. |
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fig.7 |
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6. Connect the speaker wire to the spring posts on the back of the bezel, making sure |
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to observe correct polarity (see “Connections”). |
| Cutout Diameter |
7. The speaker assembly mounts to the existing ceiling via four plastic mounting clamps |
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on the back of the speaker assembly that swivel to “sandwich” the speaker assembly in |
| 1/4“ Diameter |
place between its protruding outer frame and the rear surface of the drywall. First rotate |
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the mounting clamps inward so that the body of the speaker assembly can slide through |
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the cutout in the ceiling. Exercise caution not to damage the driver (fig 4). |
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8. Tighten the screws snugly, making sure not to over tighten, as this may compromise |
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the fit of the speaker assembly. The use of power screwdrivers is not recommended. |
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The gasket on the back the speaker assembly lip reduces unwanted vibrations against |
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the drywall and will compress slightly to allow the speaker assembly lip to rest flush |
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against the ceiling. |
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9. If the bezel frame and grille are to be painted in the ceiling, install the paint shield to |
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protect the driver from overspray (see “Painting”). Once painting is complete, remove |
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the paint shield and set it aside for use in Step #10.
10 The NHT
center of the paint shield that serves as a template for attaching it. Punch out the per-
forated circle. Place the paint shield (minus the circular section) on the inside of the metal grille, remove the backer from the adhesive dot and attach the larger absorptive pad onto the grille through the circular cutout.
11.A strip of butyl rubber is provided with this product. Application of butyl rubber is not required, but can be used to provide addition- al security when mounting the grill in place. Cut a 1/4” long piece of butyl rubber from the end of the roll provided. Peel off the paper covering and roll the rubber between your fingers until it makes a small cylinder. Make three of these cylinders and place them in the groove before installing the grill (fig.6).
12.Attach the metal grille by inserting it into the grooves in the speaker assembly.