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    SKU: OSD-ACE640

    OSD ACE6406.5" Fiber Glass Woofer Trimless Thin Bezel 2-Way In-Ceiling Speaker Pair

    Purchase 6.5" Trimless Thin Bezel High Definition 2-Way In-Ceiling Speaker Pair - ACE640
    • Outdoor Speaker Depot SKU: OSD-ACE640
    • In Stock


      Compare at: $136.99
      You Save: $45.44

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    The ACE640 ceiling speaker is the trimless version of our most popular ICE640 ceiling speaker. The ACE640 is the best combination of sound and price, it delivers very smooth silk toned music sound with 6.5" decent bass.

    Why Go Trimless?
    It's really a matter of aesthetic preference. These flush mounted speakers are hardly noticeable; that is until they're playing. Our Architectural Ceiling Element (ACE) Trimless speakers do not include the 3/4-inch trim you typically see around in-wall and ceiling speakers. The micro flange grilles are attached by extremely powerful magnets that stay put for quick and easy installation. Adds less visual impact on your architectural audio installation.

    How Does this Speaker Mount in the Ceiling?
    Customers often ask us if they need special installation mounting brackets on their OSD ceiling speakers. The answer is no and here’s why. All our in-ceiling speakers feature a dog leg (L-shaped) mounting system that is part of the frame. Before you install the speakers, remove the grille and you’ll see several the mounting screws near the front frame. These screws need to be loosened to activate the dog leg clamps. Use a screwdriver to loosen (turn to the left) these screws and the clamp will come loose. When the speaker is in position in the ceiling, tighten (turn to the right) the screw and the speaker will be secured to the ceiling.

    What Type of Speaker Wire and What Gauge?
    Wiring is not included with in-ceiling speakers so you will have to purchase some. We recommend our OSD Audio CL3/FT4 cable that is UL (fire) rated for in-wall and outdoor speaker installs. This type of cable includes a heavy-duty outer jacket approved for in-wall/in-ceiling installation. The high-quality plastic jacket is also very flexible so it's easy to run the wires inside the wall. As for the gauge, for runs up to 100 feet for background music, 16-gauge will be fine. If the run is approaching or exceeding 100 feet, we suggest 14-gauge wire. 

    What Is Butyl Rubber Surround?
    With almost double the shelf life of foam, butyl rubber has been the choice of speaker designers looking to optimize the sound based upon materials that go together. The Surround is just one of the integral parts of the speaker's motor structure. Butyl Rubber gives the speaker more excursion capability featuring a deeper bass with a wider frequency response, and its shelf life is closer to 25 years compared to the foam at 12 to 15 years.

    Testing the Sound Quality of In-Ceiling Speakers
    Many customers like to test the sound quality of their new OSD Audio in-ceiling speakers before they install them. Keep in mind, however, that these flush-mount speakers are designed to be used in the wall or ceiling. Uninstalled in-wall/in-ceiling speakers will sound weak and tinny because without the proper enclosure (in this case your house wall) the speaker can’t produce the sound pressure level it needs. If you want to try them out, we recommend mounting the in-ceiling speakers into a box of about 3 cubic ft. or larger; or simply mount them in the ceiling and then listen. This will give you an accurate measure of the sound quality.

    Warning: California's Proposition 65


    This product can expose you to chemicals, including vinyl chloride, which is known to the State of California to cause cancer. For more information, go to

    • Speaker Type: 6.5" High Definition Trimless Ceiling Speakers
    • Woofer: 6.5" Fiber Glass Cone
    • Tweeter: 1" Pivoting Titanium Dome
    • Frequency Response: 40Hz - 20kHz
    • Power Handling: 150W
    • Sensitivity: 89 dB
    • Impedance: 8 Ohms
    • Spray Paintable Grille Included
    • Inputs: Gold-plated 5-way Binding Posts
    • Install-friendly Dog Ear Installation Brackets
    • Diameter & Depth: 8.86" x 3.54"
    • Cutout Diameter: 7.80"
    • Sold As: Pair
    • Warranty: 10 Years
    2 Questions asked
    Have a Questions?

    What's on your mind?

    Anthony Wise • 04/05/2020, 10:07:11 AM I am looking to add stereo speakers to each of my basement rooms. They are about 15-20 ft square. I have three rooms. Would these suffice or should I get the 8" versions? I plan on also purchasing another AMP200 to drive these sets of speakers via two volume controls (from the zone 2 of my media room receiver).
    Customer Service • 04/06/2020, 1:27:03 PM
    Hi Tony: Either speaker will work and both are in stock. The 8" will buy you a little more Bass, they go down to 35 Hz versus 40 Hz of the ACE 640. Power handling is the same. Make sure you purchase the SVC300 for your application. Speaker Placement should be 8 feet apart 3.5' from the 10 foot wall and roughly 5' from the 15 foot wall. 1 pair of speakers will be wired from the the first SVC300 (connected to Speaker A of the AMP200) and another pair of speakers wired from the second SVC300 (connected to the Speaker B) That would take care of two rooms. I am sure you have determined which two pair of speakers will connect to a single SVC300. You can either split the signal after the Volume Control or connect the second pair of speakers to the first pair combining the Input cable from the Volume Control to the cable that will be connected to the second pair of speakers. So the first pair of speakers will have two cables terminated to each input connector (L & R +/-). Make sure you set the Impedance Matching switch to 1/2X. That will get the most output from your AMP200 (connected to your ZONE2 output). TimL/ 03-6-2020
    Matt • 11/05/2022, 10:27:49 AM Do you sell speaker back boxes that will fit these?
    Customer Service • 12/08/2022, 3:26:47 PM
    Hi Matt: We have a metal back box, the BK-BB6. It is for new construction where the walls are open. The Box opening is 7.75". The cutout dimension of the ACE640 speaker is 7.80". The boxes sell for $49.99 each. All of our In-Ceiling and In-Wall speakers feature infinite baffles so they can work without a back box. Here is a link for a guide to DIY building a Soundproofing box for speakers: TimL/12-8-2022