Originally Posted by LTD02
i hope that you have a good plan for absorbing the wave at the rear wall. a big reflection off that could really rain on the parade.
also, the area behind the ib wall should be treated so that the reflection coming off the wall behind it, doesn't come back through the drivers and mess things up.
sounds like you will have enough spl whatever you end up with.
are you giving equal time to the screen size and distance (and the total angle), your sitting location (where your eyes line up on the screen vertically), and all that?
there are lots of crazy options...
We will address the rear wall for sure. I have read a lot on treatment on the rear wall in a SBA, but have much more to read still, just to be sure.
I think you're right with regard to spl, probably over-thinking it, just neurotic I guess.
I have given as much to the video. My DPI Dvision showed up this week, so I'm going to fire it up soon just to test it out. I ultimately reduced the screen size to 180" wide 2:37. In the end, I don't want to sacfafice pq for the largest screen possible, and my PJ budget just couldn't be six figures, so anything bigger is out for now. 15' wide with seating in the neighborhoods of 13, 21 and 28 should provide one "IMAX" type row, one perfect row and a third, really good row, with respect to viewing angles both horizontal and verticle when risers accounted for. The SEOSR coverage pattern appear to be allowing for really good response across the 14' or so of seating width as well.
Originally Posted by MKtheater
I am running 8 Fi drivers in a space smaller than 300 cubes. Each driver sees about 20 cubes and Winisd modeled them for 63 cubes per driver. I would not worry about inductance with the SEOSR! Dual 15's have you covered either way. I have the DR's with 10's and the Auto EQ selected a crossover of 90hz. If the DR's and Fi drivers can be crossed over at 90hz than the SEOSR will have no problems. I mean the DR's drop off at 120hz but still have the goods to deliver. I would go for the 24 Fi drivers, or 36, and call it, why, because the advantages of the AE drivers won't be realized because you won't be using the system to max. 8000 cubes and 24 drivers gets you to a 5 star system and anymore will be headroom. I used to run my systems 10 dBs hot and with my IB 3 dBs hot is all I need now! Tactile is an understatement.
You're post have been encouraging to say the least! I don't think we'll even cross as high as 80hz, but that will remain to be seen I guess, until we get into the room and see how everything acts. I think 24 18s is a good call...like pnw siad, I can install "channels" behind the baffle and adjust the the manifold positions/cutouts to accommodate more if need be.
Originally Posted by coctostan
I hear ya. The problem is knowing how much displacement he needs to be satisfied.
Is it 2x as big?
I guess Chop should just establish a budget and buy as much displacement as possible which sounds like it is 32 of the Fi IB drivers. The AE's would offer some advantage in the upper bass but when you are talking about 32 drivers I'm not sure it will matter much. It also seems he is more concerned about coming up short on the visceral impact at 10hz than anything else.
The room is really big at around 8000cubes. I am stressing the need for that ULF impact because I basically made the assumption that either option is world class SQ and it will just come down to horsepower from there. It's actually pretty amazing how affordable these options are compared to the cost of the LMS+amps or comparable.