ACE650MK Invisible 6 1/2" Ceiling Speaker Pair

The MK650 Spitfire Ultra Reference Series incorporates premium technologies such as Kevlar woofers, pivoting aluminum dome tweeters and sophisticated crossovers provide deep bass and exceptional top-end frequency response. Kevlar is the best component for woofers. It responds note for note without coloration and has big cranking power so you can dial up your system for higher listening levels. Contour switches let you tailor frequency responses to your room arrangement.

Trimless Speakers: Heard but Not Seen!
The Architectural Ceiling Element (ACE) Trimless Series of ceiling and In-Wall Speakers are ideal for new construction or retrofit. These elegant, flush mounted speakers blend effortlessly into any room interior and offer outstanding audio performance. The secret behind these stealthy speakers are the micro flange grilles attached by extremely powerful magnets that stay put for quick and easy installation.

What are the benefits of Butyl Rubber Surround?
Much more expensive 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 allows the use of unique cone materials like Kevlar and mineral-filled composites. 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.

Do I need special cable for in-ceiling speakers?
Wiring is not included with in-ceiling speakers so you will have to purchase some. While wiring requirements will depend on your local building codes, OSD Audio offers CL3/FT4 cable that is UL (fire) rated for all residential and most commercial in-wall and in-ceiling applications. (The exception is you cannot run this cable in heating or cooling ducts in commercial applications.) This 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.

What Gauge Wire Should I Use for my In-ceiling Speakers?
For runs up to 100 feet for background music, 16-gauge will be fine. If the run is approaching or exceeding 100 feet, use 14-gauge wire.

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.

Paint the Grilles for a Custom Touch!
Many of our customers like to paint the grille of their in-ceiling speakers to match their room décor. Painting the grilles/trim won’t harm your speakers but be sure to use spray paint; never a brush. Brushing the grilles can clog the holes and interfere with sound quality. We also recommend using a fine spray paint gun, the inexpensive kind that you can pick up at your local hardware store. Our in-ceiling speakers also come with a paint shield to help guide you.


For a retrofit installation, no construction bracket is needed.