I built IB subs using 4x Dayton DCS 450-4 and two dual-opposes manifolds that recess into the ceiling. I know they are excursion-limited, but I figured for the price they should do an okay job, and they do. It’s just that, when watching movies, I’m getting just a taste of the subsonic effects that make you believe that all these earthshaking events that happen on screen are real. And it’s pretty easy to make them bottom out. I need more.
So first of several questions: Fi IB318 or AE IB18HT? The Fi is capable of higher output at subsonic frequencies, but requires a good bit more power to do so. The AE is a superb driver with lower distortion, higher efficiency, awesome mid bass capabilities, and only slightly more expensive when purchased in quantities of 10+. (I plan on using 8, but will buy 2 extra for the discount and use them in another project or expand the system in the future.) With the Fi, I may want separate tactile midbass speakers, like Dayton PA460 up front. With the AE, I wouldn’t need dedicated midbass because they do an excellent job at both duties simultaneously. Only problem is that best placement of subwoofers is likely not best placement for tactile midbass, unless they’re in the front or side walls, which isn’t the case for this setup. Ultimately, the Fi are more capable as HT subs regarding output, but I wonder if the lower distortion of the AE will be noticeable or beneficial at these frequencies. The AE in general is a better speaker. Thoughts?
Second question: is the most effective way to find the best placement for in-ceiling IB, to put a box sub elevated on top of the couch, and take REW measurements with the mic at potential IB locations?
Third: should I have each manifold on a separate amp channel and eq and time align separately? Or put them all on one and eq as a system?
Fourth: does a recessed manifold have a resonant frequency that affects the performance of the subs? When I put my head up into the manifold, I can hear a certain frequency amplified, like if I were to put a cup partially over my ears. How does this affect the sound at the listening position?
I guess that’s enough questions for now. As a bonus: I’m probably going to also replace my front 3 speakers with more capable in-wall coaxials. I’m currently using Yamaha 8” 2-ways all-around, and they’re doing a great job for their price, but wanting a little bit more. I was considering the Volt 10, but there is a thread discussing some higher end coaxial from DIY SG, so maybe I want to go next step up from Volt. Thoughts?
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