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SKU: OSD-MK640 6.5" In-Ceiling Speaker Pair MK Titanium Tweeter - MK640

Purchase 6.5" In-Ceiling Speaker Pair MK Titanium Tweeter - MK640
  • SKU: OSD-MK640 mkhifi6paces

    6.5" In-Ceiling Speaker Pair MK Titanium Tweeter - MK640

  • $69.99

    Compare at: $104.99 You Save $35.00

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With its pivoting titanium dome tweeter and 6.5' Polypropylene Cone woofer, the MK640 are superb in-ceiling speakers for home theaters or for listening to your favorite tunes. With power handling up to 150W, the MK640 also includes contour switches that let you tailor frequency response to your room arrangement, so you won't find yourself straining for more or less treble, midrange or bass output just because you don't sit in the "sweet spot." These elegant, flush-mount speakers are ideal for new construction and can be painted to match any d'cor. New construction brackets are available, and OSD speakers include convenient dog-ear brackets for retrofit applications. All OSD Audio in-wall and in-ceiling speakers are backed by a 10-year warranty. 

Tailored Sound 
Contour switches on this OSD model allows you tailor frequency response to your particular room arrangement. You won't find yourself wishing for more or less treble, midrange or bass output from one speaker just because you don't happen to sit right between them. 

Pivoting Titanium Dome Tweeter
The job of the tweeter is to deliver the higher frequencies of music and soundtracks. The tweeter is also adjustable, meaning it can be aimed toward the listening area. This can make a big difference in sound quality especially for dialog and higher frequencies.

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.

For a retrofit installation, no construction bracket is needed.

Warning: California's Proposition 65


This product can expose you to chemicals including Di(2-ethylhexyl)phthalate (DEHP) which is known to the State of California to cause birth defects or other reproductive harm. For more information go to

  • Speaker Type: 6.5" Flush-Mount Ceiling Speakers with Contour Switches
  • Woofer: 6.5” Polypropylene Cone
  • Tweeter: 1" Pivoting Titanium Dome
  • Frequency Response: 32Hz - 22kHz
  • Power Handling: 150W
  • Sensitivity: 92 dB
  • Impedance: 8 Ohms
  • Contour Switches: ±3dB Bass and ±3dB Treble
  • Spray Paintable Magnetic Grille Included
  • Inputs: Spring Loaded Binding Posts
  • Install-friendly Dog Ear Installation Brackets
  • See New Construction Brackets For Compatibility
  • Diameter & Depth: 9.12" x 3.87"
  • Cutout Diameter: 7.87"
  • Sold As: Pair
  • Warranty: 10 Years
3 Questions asked
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Jeff • 12/17/2019, 2:17:43 PM Will these speakers work in an outdoor covered patio in North Texas.
Customer Service • 12/17/2019, 2:17:43 PM
Hi Jeff: Yes they will work in an outdoor covered patio. I just would recommend using a little silicon around the cut out hole to help seal the frame to your ceiling. The grills are powder coated to guard against rust and both the frame and grill are printable. Just make sure to pull out the cloth on the inside of the grill before you place it back on the speaker or if you do decide to paint the grill remove the cloth after you paint. Good choice TL/3695
greg • 12/17/2019, 2:17:43 PM Hello, Looking for indoor speakers and don't know anything about OSD what can anyone tell me about them and there products
Customer Service • 12/17/2019, 2:17:43 PM
Hi Greg: OSD Audio started in 2003 as a web based E-tailer for Outdoor Speakers, Rocks, Patio and many different garden type speakers. We started out distributing for a number of name brand custom install companies including Sonanace, Speakercraft, Proficient, AR and others. We decided we anted to be a one stop shop to cover whole house audio both inside and outside and been a major supplier for Custom Home Theater. We pretty much supply everything you would need other than the TV Monitor or Audio Video Receiver. So we feature a good, better and the best for In-Ceiling, In-Wall and all the Outdoor speakers. We offer both 8 ohm and 70V solutions. We have two channel and multi channel power amplifiers, Speakers Selectors with and without internal impedance matching volume controls. Plus a complete line of Volume Controls for inside and oudoor; Impedance Matching Transformer style or Resistor based. We also offer all the wire and cables including CL3/FT4 rated speaker wire approved for in-wall or direct burial installations, Wall plates to take to cable into and out from the wall plus a complete selection of TV Wall mounts. Checkout our complete web site. WE also offer a service to help you with your system design under the Upload Your Plans section. TL/4146
Charles • 12/17/2019, 2:17:43 PM I want to build home theater room size 15x25 using 3 ACE 670 in front and 2 MK640 veiling height is 10 foot am I on the right path
Customer Service • 12/17/2019, 2:17:43 PM
HI Charles: The ACE670 would be a very effective front stage LCR, Left, Center and right channel. I would suggest if you're going to go with the MK640 for the rear you might want to consider adding a second pair and plan to mount them two to three feet in front of your seating area for the DOLBY ATMOS and DTS:X effects speakers. The initial pair would be mounted two to three feet behind your seating area for the Surround Channels. Worse case plan to pre-wire for the effects/height speakers. I am assuming you are using a 7.1 or 7.2 Receiver. You might have a 5.1 to start but that wont be forever. We also have some great deals on Powered Subs as well. Check out the S10 that is affordable enough to buy two. Good luck TL/5002