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Definitive Technology DT6.5R

In-ceiling speaker

Item # 735DT65R

Definitive Technology's DT6.5R in-ceiling speaker offers high-quality sound with a nearly invisible design.

Definitive Technology's DT6.5R in-ceiling speaker offers high-quality sound with a nearly invisible design.

5 questions - 7 answers

Item # 735DT65R

In stock
$199.00 each

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Since 1974

Years of experience making people happy.

About the Definitive Technology DT6.5R

Kramer Crane

Dynamic in-ceiling sound from Def Tech

Definitive Technology's DT6.5R in-ceiling speaker offers high-quality sound with a nearly invisible design. Put a pair in rooms where you want music without taking up any floor space, or as your home theater's surround or overhead channels. 

Dynamic in-ceiling sound from Def Tech

Definitive Technology's DT6.5R in-ceiling speaker offers high-quality sound with a nearly invisible design. Put a pair in rooms where you want music without taking up any floor space, or as your home theater's surround or overhead channels. 

You'll enjoy crisp bass response from the 6-1/2" polypropylene woofer, and smooth highs from the 1" aluminum dome tweeter.

DIY installation

If this is a do-it-yourself install, check out my guide to installing in-ceiling speakers, along with our selection of in-wall speaker wire. You can paint the included magnetic grille to have your speaker blend in with your décor.


Product highlights:

  • ideal for an in-ceiling music system or overhead surround effects in a home theater system
  • 1" aluminum dome tweeter
    • tweeter is aimable to direct high-frequency details towards you
  • 6-1/2" mineral-filled polypropylene woofer
  • frequency response: 28-30,000 Hz (±3 dB)
  • recommended amplifier power: 10-100 watts
  • sensitivity: 89 dB
  • impedance: 8 ohms
  • ultra-thin bezel and paintable magnetic grille provide seamless integration into your décor
  • speaker cutout diameter: 7-1/4"
  • overall diameter: 8-5/16"
  • mounting depth: 2-7/8"
  • warranty: 5 years
  • MFR # UGDA

What's in the box:

  • In-ceiling loudspeaker
  • Grille
  • Mounting template
  • Carboard paint shield
  • Owner's Guide
  • Online Product Registration Information
  • Important Installation Instructions

Customer reviews for Definitive Technology DT6.5R

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5.0 out of 5 stars
12 reviews

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More details on the Definitive Technology DT6.5R

Stacey B.

Features & specs

Quantity in Package Single
Tweeter Hard-Dome
Aimable Tweeter Yes
Woofer Composition Polypropylene
Woofer Surround Rubber
Connector Type Spring post
Bi-Amp Inputs No
Built-in Back-box No
Moisture Resistance
Indoor (Moisture-resistant) No
Outdoor (Partial Exposure) No
Outdoor (Full Exposure) No
Tweeter Size 1
Midrange Size N/A
Speaker Shape Round
Woofer Size 6.5
Cutout Width 7.25
Cutout Height 7.25
Mounting Depth 3.5
Power Range (Watts) 10-100
Sensitivity 89 dB
Impedance (Ohms) 8
Frequency Response 28-30kHz
Parts Warranty 5 Years
Labor Warranty 5 Years

Product Research


DT Custom Install Series: The DT Custom Install Series by Definitive Technology is purpose-built for multiroom and home theater applications where great performance, minimized visibility and ease of installation elevates the experience. The DT Custom Install Series offers exceptional sonic performance from speakers that seemingly disappear into a wall or ceiling. Definitive Technology speakers are designed to immerse you in sound. Every element is optimized for superior quality, and each part is developed from scratch for audio that delivers and products that endure.

1" Annealed Aluminum Dome Tweeter: The 1" ceramic-coated annealed aluminum dome tweeter is lightweight, yet rigid and has been acoustically optimized to reveal even the most delicate detail in recordings. The tweeter has a low-diffraction swivel mount that helps improve dispersion, as well as overall midrange and off-axis response. The aimable tweeter allows you to focus the sound toward or away from your listening area, depending on the application.

  • When using DT Series speakers as fronts in a home theater setup or as stereo speakers in a distributed audio system, aim the tweeter toward the main listening position.
  • As rear or surround speakers, aim the tweeter toward the nearest reflecting surface (an adjacent wall or ceiling) for a more diffuse soundfield; for more direct sound, aim the tweeters at your listening position.

6.5" Composite Mineral-Filled Polypropylene Woofer: The exclusive 6.5" composite mineral-filled polypropylene driver cone with rubber surround produces a clear and natural sound, as well a provides durability and longevity.

High Definition Crossover Network: The high definition crossover network utilizes mylar capacitors that deliver a smooth transition between the tweeter and woofer for purest high and midrange frequencies.

Low-Profile Magnetic Grille: The DT Custom Install Series in-ceiling loudspeaker includes a low-profile grille with a slim bezel that uses neodymium magnetics for fast and tight attachment. The grille can be custom painted to match your decor. The grille measures 8.3125" in diameter and only protrudes 0.1875" from the mounting surface.

Spring-Post Terminals: The DT Custom Install Series in-ceiling speaker is outfitted with spring-post terminals to connect bare wire (18AWG-12AWG), pin-connectors, or banana plugs (single only).

In-Ceiling Installation: The DT6.5R mounts in a ceiling (1/2" drywall is recommended) and requires a round 7.25" cutout and a mounting depth of 3.5". The speaker is secured to the ceiling using the four integrated mounting clamps (make sure to not over-tighten the mounting clamp screws). The cutout should be at least 2" from adjoining walls or ceiling, internal studs or plumbing to prevent interference with the mounting clamps. It is recommended to place the speaker at least 2" from side walls for optimal sound dispersion.

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Customer Q&A

5 questions already asked

I can't seem to get the speaker cover to sit cleanly against the ceiling. 75% of it does, but one side always pops off creating the gap, which draws my eye every time I walk by it. Any suggestions?
jonathan  Apr 11, 2023
1 answer
Greetings Jonathan, sorry you are having this issue. Looks like you bought two of those from us. If you would not mind, please call our technical support group for assistance. If you still have the shipping confirmation email, their direct number would be on that email. If you cant find that, call 800-324-9695, and one of our members can switch you over to a technician.
hogan  Apr 11, 2023 (Staff)
Is a back box available for these? If not, is it suggested to make one? These will be placed in the ceiling of my basement, which is basically a hollow space between joists.
david  Dec 04, 2021
2 answers
No back box is available I am aware of, and I wouldn't think one is necessary. I have these mounted in the ceiling as well - I put a sheet of thin plastic over the back to keep insulation out, otherwise I don't think anything else is needed.
howard  Dec 04, 2021
A back box is not needed
timothy m  Dec 04, 2021
Would these work for Dolby Atmos?
joseph  Jan 05, 2021
1 answer
Yes, that's what I am using them for. They are paired with some legacy model Definitive Technology speakers.
howard  Jan 05, 2021
can i use banana plugs with these if not which ones take banana plugs?
vito  Oct 01, 2019
2 answers
In ceiling speakers are designed to use spring posts. You may be able to fit banan plugs into them, but they are designed for bare wire.
thomas  Oct 11, 2019 (Staff)
I was asked to respond to this question, but unfortunately, I don't know the answer. These speakers and wiring were installed in the ceiling by an electrician. The electrician did not use banana plugs, but I don't know if using banana plugs was an option.
alan  Oct 01, 2019
Can I install these in my van? Would they fit into a standard 6.5" car door mounting bracket? 2009 Honda Odyssey front and back doors
ray  Aug 04, 2019
1 answer
You can check to see if this will fit your vehicle by using our Outfit My Car tool: For additional details on fit or installation please contact an Advisor by phone (1-800-324-9695) or online chat. They will be able to pull up your vehicle and give you the details on if this will fit and what you will need for an installation in your vehicle.
kristina  Aug 10, 2019 (Staff)

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Definitive Technology DT8R
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Get fuller bass from a larger woofer

The Definitive Technology DT8R offers these features:
  • 8" mineral-filled polypropylene woofer
  • recommended amplifier power: 15-100 watts
  • frequency response: 27-30,000 Hz
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