I just finished reading every post in this thread. It took a few weeks. I feel like I deserve a prize!
I asked about Def Tech ceiling speakers in the Definitive Owner's Thread and got a few responses, but I though I'd give it another go over here.
I am a very long time Definitive owner. About six months ago I replaced my ancient B&K Reference 20 pre/pro with a Marantz SR7010 receiver with Atmos 7.1.4 capability. I'm looking to do four ceiling Atmos speakers in the not too distant future. My first thought is to stick with Definitive for the best timbre match and go with DI series 6.5" or 8" coaxials, but I am open to considering other options. I want something that will keep up with the rest of my system so I'm not considering any of the discount speakers people seem to like such as the Micca.
Here is my current setup.
BPX bipolar 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.
(No standalone subs. I've always felt like the 15" powered subs in the BP2000s were enough for my room.)
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 Def Tech Mythos or Studio Monitor surrounds instead. Now that I have them, I figure I might as well see how Atmos sounds with bipolar surrounds before I consider selling them. A few people in the Def Tech thread did say that they are perfectly satisfied with bipolar surrounds in their Atmos systems.
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 this thread, it's clear that speakers with at least 90° dispersion are recommended for optimal results. The DI series in-ceiling speakers all say they have wide dispersion characteristics, but Definitive doesn't give any numbers or graphs on their website. I only have one 3 person sofa that I care about covering so perhaps this isn't as critical as it is for others with multiple rows of seating. Maybe some of the more directional designs like the RSL C34E that everyone seems to love would serve me just as well as Def Tech and at a lower price point. The Atlantic Technology IC-6OBA-S is also on my radar for the unique dipolar tweeter design that is supposed to reduce hotspotting, but I'm not sure if it's a good timbre match or if I need to spend the extra money to adequately cover one sofa.
Ideally I'd like to cross my Atmos speakers over at 80 HZ. The 6.5" probably doesn't get me there and I don't see any way the RSLs could play that low. This is not an absolute deal breaker, though. I could probably live with 100 or 120 Hz. I'll make custom back boxes both for reducing sound leakage into the room above and to get good FR.
, any further thoughts on your DI 8Rs after living with them for a bit longer? Have you settled on a final crossover point? You might have said already, but how are your tweeters pointed? At the MLP? Have you experimented with the tweeter aiming much or did you just set it and forget it?
, I saw that you considered Def Tech speakers. Do you recall what you found to be their shortcomings? Do you feel they'd be a decent option for me since I don't have to cover a large area? Did you save any measurements you made or any specs you obtained for them?