Ok. I'm a little confused now. The IL36c, which has a mid range driver, has a lower crossover point for the tweeter at 2500Hz than the IL10 which is at 2800Hz. If it matters the crossover point for the midrange on the IL36c is 800Hz. I would have thought the crossover point on a 3 way design for the tweeter would be higher than a coincidental 2 way from the same series.
You would think that. The problem is try and do it!
Centers are a particular problem, and three ways a perpetual problem.
First three ways. A decent mid range is a formidable affair, and wide band mid ranges far and few between, even rarer if you want high power and wide bandwidth. Also the choice actually gets worse rather than better. There are no really good cheap mid range drivers. Either you have limited bandwidth and or power handling and usually both.
This is important as to make a three way that sounds in any way reasonable the crossover points need to be three octaves apart. You can just about get away with 2.5 octaves.
The ideal is to have the mid range pretty much cover the speech discrimination band. That means crossover points at 350 to 400 Hz and 4 KHz on the upper end. However the driver bandwidth must be greater than that, or you can't design a functional crossover.
The low crossover point demands high power handing capacity which finds itself at odds wilh wide band width.
The speaker you are talking about, will not be very good, and not something that would attract me.
Now the center. The trouble comes, in that most want the speaker horizontal, so a two way gives you a horrid lobing pattern and exacerbates room problems, by reinforcing floor and ceiling reflections, which it is best to minimize.
The best solution I'm convinced, is a full ranger, or coaxial. Full rangers that are any good are as rare as hen's teeth. However I have a good one in one of my systems, it has excellent speech clarity without shout at low volume. It is in out condo where we can't blast the system. The 4" JW module has fantastic speech clarity even at very low volumes. That driver appeared in 1959 by the way. I'm certain it is still the best of the bunch. That really brings home to me the paucity of study and creativity in driver design over nearly sixty years now!
The only decent coaxials to source are from SEAS, and they are expensive. In addition for high power you need two of them for good power handling in the lower octaves. In addition the driver with the tweeter connected will need to be central and the other driver to one side or the other. Nothing wrong with that, but the marketing boys will nix it as it looks strange.
So that means that you end up with a three way center. Doing it on the cheap, is very difficult.
In addition the central mid and tweeter look at a wide baffle. Not the best for imaging, and certainly not the best for your application. For a center acceptable.
I have been designing a cost effective HT speaker system with high WAV for months now. The left and rights were the easy part. You get two larger drivers to handle the power range.
The center is a problem. I have a nice design now, crossover points are 350 HZ and 2.5 KHz. Just enough band width from a $30 mid to do it. However in that band, power handling will be 30 watts. To get high power shoots cost effective right out of the water, and so would a mid range able to be crossed at 3.5 to 4.0 KHz and both would really drive the cost.
A coaxial works very well indeed as you get a nice cone of coverage and minimal interference with the mains.
I'm certain having three identical speakers for the front three is less than ideal.
