Very long time Definitive owner here. A few months ago I replaced my ancient B&K Reference 20 processor with a Marantz SR7010 receiver with Dolby Atmos 7.1.4 capability. I'm looking to do four ceiling Atmos speakers in the not too distant future. I've read through 27 of the 78 pages in the "Best in ceiling speakers for Atmos?
" thread and so far there has been no talk from Definitive owners so I thought I'd ask for thoughts over here on the Definitive DT and DI series in-ceiling speakers. Also, I'd be curious to know if anyone here has tried an Atmos setup with bipolar side and back surrounds. (No, I haven't had time to read back very far in this thread yet to see if these topics have already been discussed.)
Here is my current setup.
BPX side surrounds.
Marantz SR7010. Using as a pre-amp for the ear level speakers. The receiver amps will power the Atmos speakers, though.
B&K 2-channel amp for the mains.
B&K 6-channel amp for the center and surrounds.
The B&K Reference 20 was a 5.1 processor. After many months of watching eBay, I recently picked up a second mint pair of BPX speakers to go to 7 channels, but I haven't hooked them up yet. It wasn't until the day after I purchased those that I really started to think through and research future upgrades and it occurred to me that maybe bipolars aren't the best option for the new object oriented 3-D audio formats. Perhaps I should have sold my BPX speakers and picked up four Mythos surrounds instead. Now that I have them, I figure I might as well see how Atmos sounds with bipolar surrounds before I think about selling them.
I currently have a suspended ceiling, but I'm looking to replace that with drywall sometime in the next few months. That's when I'll do the Atmos speakers. I'm hoping to take the ceiling up to 8', but there are some complicating issues that may force me to stay at the height of the current ceiling, which is about 7' 9". Reading through the Dolby Atmos white paper and the ceiling speaker thread, it's clear that I need speakers with at least 90° dispersion. The DT and DI series in-ceiling speakers all say they have wide dispersion characteristics, but Definitive doesn't give any numbers on their website. Has anyone used them for Atmos? I'd also be interested to hear what anyone using them as standard surrounds thinks of them. I'd probably go with 6.5" or 8" coaxials. I want to cross them over at 80 HZ, so certainly nothing smaller. For timbre matching, sticking with Definitive for the Atmos speakers seems like the obvious way to go if their dispersion characteristics are suitable.
If you have Def Tech in-ceilings, I'd also be interested to know if you are using them with or without a backer box. Definitive's owner's manuals say they make backer boxes, but they don't have any info about them on their website. Maybe they perform great without a box, but it sure seems like getting decent mid-bass response would be tough without an enclosure. (Admittedly, I have no experience with in-wall or in-ceiling speakers.) Since I'm taking the old suspended ceiling down, I could construct custom boxes if I can get a recommendation on volume and damping material out of Definitive.
Lots of people in the ceiling speaker thread are raving about how great the Atlantic Technology IC-6OBA-S
speaker is for Atmos. Particularly with an 8' or lower ceiling such as mine. They are saying the unique dual dipolar tweeter arrangement really reduces hotspotting issues. AT is marketing this as specifically designed for Atmos use.
That's got me wondering how the DT6.5STR
with it's dual tweeter design would work for Atmos. (Obviously there is a big difference between bipolar tweeters and dipolar tweeters.) The DT6.5STR must have extra wide high frequency dispersion along the axis of the tweeters. It seems to be switchable between stereo mode where left and right are fed to a single speaker in a distributed audio system or bipolar surround mode according to the webpage. The manual doesn't have any detail on this.
Also, I'd like to chime in on the standalone sub issue. I've never felt the need for a standalone sub with my BP2000s. I haven't spent any time listening to Definitive's newer lines so I don't know how the sub section in the 9080s compares to the 15" subs in the BP2000s. I can say that I recently went to a special SVS event at ListenUp in Denver and I don't think anything short of the Ultra series would add anything to my system and I just don't feel like I need more low end in my mid-sized room. Obviously if you are going with something smaller than top of the line towers then you'll want to consider a standalone sub or two and I highly recommend SVS. Even the least expensive SB-1000 they had set up with Prime satellites absolutely rocked. The 13" and 16" Ultra series subs can go toe to toe with anything out there.