I used these as ATMOS ceiling speakers and they do not disappoint.
Mounting was easy and the mechanisms are much higher quality than other speakers I have mounted.
The magnetic grilles make removal SOOOOOO much easier than the old paper clip hook method.
Very clean, flush look in the end and great sound quality.
They are a bit pricey, but it nice to have the sound matching with other Definitive speakers.

Fantastic clarity, and shocking Bass!! I am thrilled with these. Voice matched to my BP10’s and Center too. Ultra-thin bezel on the cover grill. They look very “upscale” once installed if you even notice them. I’m using them for Atmos playback. My pup looks up at them often!

Balanced Double Surround System (BDSS): Definitive Technology’s unique BDSS driver design delivers wider frequency range and better sound dispersion than typical in-ceiling speakers.
Pivoting tweeter: Adjust the orientation of the 1-inch aluminum tweeter to direct sound for optimal listening.
Paintable grilles: Customize the grilles to perfectly match your ceiling.
Easy installation: Robust mounting system and clear instructions make installation a breeze.
Sound Quality
One of the standout features of the DI 6.5R is its ability to deliver big, full-range sound that belies its size. The bass is surprisingly punchy, the mids are clear and detailed, and the highs sparkle without harshness. These speakers are ideal for filling a room with immersive sound, whether you’re enjoying movies in a home theater setting or simply listening to music.
Design
The DI 6.5R boasts a flangeless design and a micro-perf grille that minimizes their visual impact. Once painted, they become almost invisible, allowing you to enjoy premium sound without drawing attention to your ceiling.
Ease of Use
Installing the DI 6.5R is a straightforward process. The mounting system is secure and easy to handle, making it an accessible project even for those without extensive DIY experience.
Value
The Definitive Technology DI 6.5R delivers excellent value for its price point. You’re getting a speaker that combines great sound performance with a discreet, adaptable design.
Overall
If you want high-quality audio from an in-ceiling speaker that’s easy to install and disappears into your decor, the Definitive Technology DI 6.5R is an excellent choice. These speakers are ideal for both the dedicated home theater enthusiast and those looking to enhance their home’s audio setup.

I started shopping for these almost a year ago when our house was under construction. I went to Best Buy to compare their in ceiling speakers. The Best Buy person recommended Sonance speakers, but the DI 6.5Rs just sounded much better. I felt the Sonance MAG series speakers sounded very muddy.
I ended up buying 4 of these for the great room. First, installation was a breeze. I was a little nervous taking a drywall saw to my new ceiling, but the template made things simple. I had run the speaker wires before the drywall went up, so that part of the task was already complete. I did use, and highly recommend, XTC 10 inch speaker baffles that create a protective cavity in the ceiling. With the holes cut, the baffles in place, the speakers just slid into place and the 4 tabs are holding the speakers nice and snug. Just don’t overtighten the screws. The magnetic grills snapped into place, leaving a clean, stealthy installation (see photo).
I hooked these up to a Yamaha RX-V4A. Not the highest end AVR, but acceptable for my needs in this room. The sound is already good and I am sure that will improve as they break in. My only concern is the bass. As you can see from the photo, the room is rather large. I am considering adding a subwoofer. I am not a big bass person, I keep my subwoofer in my theater room pretty low. I just feel a subwoofer will help these speakers fill the room with the low end.
Overall I am very happy with these speakers and I will be installing two more of these as my Atmos height speakers in my theater room.
I knocked off 1 star in value, due to the price. Perhaps it was the sticker shock of buying four of these at once.