How To Install In-Wall Speakers

If you’re reasonably handy and not afraid to cut into drywall in your home, installing in-wall speakers can be a fairly simple affair. You’ll need to assemble the basic tools, including a drywall saw, a stud finder, an electrical snake or fiberglass push rods to run the wires, a tape measure, a drill with a long bit wide enough to pass your speaker wire, and a screwdriver, most typically a No. 2 Phillips.

Determine Speaker Placement
Ideal speaker placement for the front left and right speakers is 6 to 10 feet apart and positioned at seated ear level. Try to locate the speakers at least 3 feet from a corner to avoid boomy bass from boundary effects. Odds are that the left and right will straddle a flat panel or screen and the center will go in just below, or sometimes above. As with any system, you should ideally mount the surround speakers to the left and right of the primary seats, slightly behind the viewing position and about 6 feet off the ground, although if you listen to a lot of multichannel music, you might target a height more in line with the fronts. Once you’ve identified your locations, use your stud finder to determine the center of each stud bay you want to mount in. Depending on the speaker, you may have a little leeway to move left and right within the bay. But ultimately there needs to be enough clearance to mount the speaker between the studs.

Identify Your Wire Paths
Before you take saw to drywall, plan out your wire runs. If you’re mounting in a first-floor room and the basement ceiling is unfinished, or in a second-floor room with attic access, you might be able to see any ductwork, pipes, or electrical cables that could potentially interfere with your mount location. The likely scenario is you’ll cut a one- gang or two-gang electrical box opening into the wall behind your equipment rack, then drill a hole from the stud bay you’ve opened up through the floor plate (for first floor) or the top plate to run the wire into the basement or attic. From there, you’ll run it across the basement or attic to the stud bay where you’re mounting the speaker, and drill up or down accordingly into the bay. Sometimes, it’s easier (and safer) to drill up or down into the stud bay rather than from the bay into the basement or attic.

Check for Obstructions and Cut the Holes
OK, it’s almost time to start ripping. Once you’ve identified your speaker locations using your stud finder and made sure you can get wires to them, check for obstructions behind the drywall, such as electrical wires, ducts, or pipes. Drill a small 0.25-inch hole in the wall at the center of the stud bay and insert a coat hanger bent at a 90-degree angle; move the coat hanger around to feel for any obstructions. If you find any, it’s easy to patch the small hole. If everything looks cool, you can start carving the full speaker cutout. Use the template that came with the speaker, align and mark the cutout lightly with a pencil, and have at it. Here’s some good advice: Start with a small, rectangular hole at the center of the proposed cutout that’s big enough to get your hand in, and before you cut the full hole, take a peek with a small wand mirror or carefully feel around again to make sure there’s nothing that’ll make trouble for you. You can also use this opportunity to send a fiberglass push rod or snake down (or up) to make sure your wires will make it all the way to the top or bottom plate without running into blocking or other obstructions. Cut this exploratory rectangle with beveled edges, with the point of the blade pointing toward the center of the speaker location as you move around. If you need to change your speaker location, the piece you cut out will fit into the hole like a lid and make for easier drywall repair.

Running the Speaker Wires
There are four choices for installing speaker wires. As mentioned, you can run them overhead through an attic space or beneath the floor if you have a basement or crawl space. But you can also remove the baseboards, cut a channel into the drywall with a utility knife, run the wires, and then replace the baseboards. The last option is flat speaker wire that adheres to the walls, although that’s the least desirable. If you’re running wires laterally across the wall and can’t get access from above or below, you may need to cut small holes in the drywall to expose the studs and drill holes large enough to pass the wire. The drywall holes only need to be 1 inch high and wide enough to expose the stud. They’re easily patched later. Typically, 14- or 16-gauge wire works well for most installations up to 100 feet. Beyond that, use 10- or 12- gauge wire, which is larger in diameter. Use cable that’s rated for in-wall use.

Installing the Speakers
If you want to paint the frames and grilles to match the walls, do so before you install them. Always use spray paint or a sprayer and mask the speaker components. Use light coats; don’t clog the grille perforations. Most in-wall speakers use four or six dog-leg clamps to secure the speaker to the wall. Some are two-piece designs, so the frame attaches separately to the wall with clamps, and the speaker locks or screws into the frame later. Consider installing insul-ation (R-13) in the wall cavity behind the speakers to improve sound quality. Before you screw the speaker into place, you’ll need to attach the wires to the binding posts, which are most likely spring-loaded terminals. Once you know the speakers are working properly and you’ve adjusted any EQ controls or the position of drivers, slap on the grilles, sit back, and enjoy.

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COMMENTS
andyloso's picture

Hi, I am finishing my basement into a home theater and installing Paradigm AMS series inwall speakers. I would like to know if I should build back boxes into the wall cavity to improve sound quality.

TheJoBoo's picture

Your local Paradigm dealer can get you back boxes for certain AMS models. I can also recommend the Dynamat En-Wall (not a typo). They work well with every in-wall speaker we've tried.

Big Woods John's picture

One of my side walls is a 6" exterior wall (with batt insulation). Are there restrictions on installing an in-wall speaker in an exterior wall?

TheJoBoo's picture

Let's not forget to use speaker cable that meets the requirements of the National Electrical Code's Article 725, unlike the speaker cable shown in the article's picture. CL3 speaker cable is available from many companies. Even do-it-yourself types, ugh, should know and follow code.

Rob Sabin's picture
Thanks, JoBoo -- this last point very well taken. These were old photos picked up from an article published a long time ago in home theater, and I didn't notice that the cable shown in the open wall cavity is absolutely NOT code. In-wall speaker cable has the conductors in their own insulation as you see here and then contained within a protective sheath. In-wall cable glides better through studs and walls, has better tensile strength to avoid breakage from pulls, and offers more protection from sharp protrusions. It's designed to work better and be safer when run in wall cavities shared with electrical lines. ALWAYS follow NEC code when doing any kind of low-voltage custom install work.

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