Manifold Question With Pic

[stidrvr]

I thought that I read that there should be at least 2ft from a wall from your manifold. Im assuming that the same applies to manifolds mounted where the drivers face the floor like in the pic.

So what are the effects when the drivers are mounted close to the floor like the in the picture?

[ThomasW]

As seen in the pic there's about 18" of clearance between the bottom drivers and the floor

In an optimal situation Kevin would have mounted the IB so the bottom drivers were further away from the floor. Or he could have created a design where the bottom drivers were firing forward from the back of the box.

But he didn't ask before building the IB.

[stidrvr]

Well heres the reason I ask. These are my mounting options:



The IB is 4 Ficar IB18's powered by a QSC RMX-2450


Red: This is the similar to the previous picture. By the time I have the manifold and the drivers, Im going to be pretty close to the ground.

Blue: Running two manifolds is my favorite, but the only downside is the backside of the wall. I was going to be building another wall on the backside of the theater that will be perpendicular to the screen wall. The wall would have ended right about in the middle on the left manifold (in your facing the sceen wall). I could redo the idea of the wall and move its location. But there arnet a whole lot of options with that either.

Green: This one is the least problemactic. Easy, one manifold for all four drivers. Its side mounted, not my favorite, but I'll live. The only downside, is that the opening from the manifold is directly across the room from the entrance to the theater. There is no door there, but around the corner. Is that a problem with no door? There is a small foyer outside the room where ther rack etc will be, maybe 90sqft total. That area, the foyer, will have door.

Ive tried to build this room with performance first and looks and function 2nd. Which one these options would follow those lines?

[ThomasW]

I'd go with the blue. If a wall ends up in the middle of the back of the manifold it's not a big deal, unless that wall creates too small an area for the rearwave off one of the drivers.

BTW, what's the purpose of that wall?

[stidrvr]

Im going to try to explain this the best I can. With pics of course.

Alright, My basement is completely unfinished, except for my room. Well thats not really finished either, but anyway. So when you walk downstairs, you walking into an unfinished basement.



You can see where the stairs are in relation to the room. Also note where the entrance in to the theater.

You then have to walk in this unfinished basement to the "finished" theater room.

Right where the double gang switch is on the left is the back side of the stair wall. This wall is going to be continued straight to the wall of the theater. That area will be finished off, leaving the rest of the basement unfinished, or for whatever else I decide to do.



Note the problem with this wall is that it will end right about where the manifold will go. Although it may be a little more work, this is probably what I will do.



The red line is what I was going to do, but if I make the bump out, the green line, that shouldnt cause any problems.

[ThomasW]

Okay that makes sense, and in that case I'd go with the red box option.

If you want to go with up/down facing drivers place some OC-703/705 or Roxul pads on the floor below the lower woofers those pads will absorb quite a bit of sound.

The other option is a rectangle with 2 drivers in the back facing forward, and one driver on each end facing in.

A third option since you have that 'walk way' in the rear of a very deep room is to do a pair of 18"s below the screen and another pair at the rear of the room. This option should be checked out using drivers mounted in sealed test boxes before committing to any cuts in the walls.

[stidrvr]

Neither the red or green wall are up. I can do either or, it's just that the green wall wasn't what I was planning on doing. If the blue options would be better, I'd rather do that. The blue option would be easier for me to build the manifolds