Is my IB plan OK?

Moto,

Welcome to the forum. Since our master has left us children to watch over things, I will try and help some.

Usually he asks for a layout or pictures of the space. This will help with layout suggestions. Also, have you done any response measuring to direct you where to place the manifold? Also, is the room sealed or opened to other spaces. How large of an area (how big of an attic space) do you have for the rear wave?

As for drivers... I would look at the Fi IB318's. Two of them will out displace all four of the DPL drivers and cost less. I would plan on four, but you can start with just two.

www.ficaraudio.com

The amp you selected is good. You also need to look into some type of eq. You don't need it now, but just be prepared.

And as always.... Thomas consistently points out to read the FAQ section.

You can start with just two 18's, but build the manifold to hold four or plan on a second manifold at a later date. Get the first two up and working first and then you go from there.

Maybe we should know a little more about your current set-up and what kind of levels you are trying to reach.

Maybe some of the other knowledgeable members will post more tonight (other side of the world).

I would plan on four 18's then.

Man, I just read thru some of "The Octagon". That guy is WAY over my head!

I did come across on interesting idea. He uses multiple surrounds at different phases, apparently using a Behringer DCX2496 which is about $275 (although I could be totally wrong since this stuff is so far over my head). I wonder if a normal HT could do this using about 6 speakers and adjusting the phase?

As far as going there to see it, maybe. I live about 3 hours+ from Atlanta.

ThomasW, do you have his email address? (tried to send you a PM but I cannot send one to an Admin.

Thanks
Moto

OK, after much searching with REW and my sub, the best place for my IB is on the right wall just above (5 feet from the floor) and just behind (2 feet form the back wall) my right front speaker.
Behind the wall is 3 hallways leading to front door, a large bedroom and kitchen.

Questions:
1) Will this create any unusual problems?
2) If I use a cube manifold will gravity cause any problems for the top and bottom subs?
3) I am supposed to make the smallest manifold possible. What size should this be for 4 IB318's? The hole cut into the room can be whatever size is needed.

Or:
I can use a rectangular manifold. Dimensions would be 23.5" deep x 45.5" High x 18.5" wide. Corresponding opening would be 44" x 17". This would solve the gravity problem.

Or (and this is the aproach I am leaning towards now)-
I have room in the same area to make a line array of at least 2 but can do 4 18" subs or a faceted array with 2 on each side. Do you need less subs for a line array or the same for the same amount of bass? Also will securing it to the 2x4's in the wall make it rigid enough, if not what does it take to make it so (I will of course build the array to spec. double 3/4 layer, 2x4 frame etc.).
Man theres too many decisions to be made .

Just to review:
-4 IB318's. All 2 ohms and wire them in series to create 2 4 ohm pairs.
-Behringer EP4000 amp
-BFD for eq
-1760 cf sealed room, carpeted cement with acoustic panels.

Thanks again.
Moto

Looks like I am going to go with a rectangular manifold in the attic. What size do I cut the holes for Fi ib318's.
I will have the box built before the subs get here as my boxbuilder is going on vacation.

Thanks
Moto