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Post by slovenian6474 on Nov 18, 2008 14:41:32 GMT -7
I'm in the works of planning a whole home theater setup in a room. I would LOVE to do IB but the only space i would have available is under the stairs which is on the left side of the room. Now the room measures only 12' x 36' and the IB would be placed about 3'-4' from the front of the room. I was thinking of doing 2x IB15s. Is this going to do well? I'm concerned that having on it on the left side of the theater would cause problems. Since this is the only way it would work, it's between putting it there or going with a tradition box sub.
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Post by tipicreeper on Nov 18, 2008 14:57:56 GMT -7
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Post by ThomasW on Nov 18, 2008 15:33:00 GMT -7
Yes it should work. Might want to consider using 4 of the AE IB 15"s though..
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Post by slovenian6474 on Nov 18, 2008 15:53:22 GMT -7
beta.floorplanner.com/projects/18198919Here's a quick mock up of my room. The sub would go in the area under the stairs. I measured the volume under there and it's 4821 liters. The room and under the stairs i think is too small for 4x IB15s. I read the FAQ here and it said "For those that can't do a 10 times Vas IB, but can do at least 4 times Vas, go ahead and build it. "4x the Vas of 2x IB15 is 3512 liters. I honestly don't think i could fit 4x IB15s in there.
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Post by chrisbee on Nov 18, 2008 15:59:26 GMT -7
I'm in the works of planning a whole home theater setup in a room. I would LOVE to do IB but the only space i would have available is under the stairs which is on the left side of the room. Now the room measures only 12' x 36' and the IB would be placed about 3'-4' from the front of the room. I was thinking of doing 2x IB15s. Is this going to do well? I'm concerned that having on it on the left side of the theater would cause problems. Since this is the only way it would work, it's between putting it there or going with a tradition box sub. I assume you are considering listening and watching along the room's greater length? Would it help your layout to listen across the shorter room dimension? I have been listening across various listening rooms for decades. This layout allows you to space your speakers well apart without having them stuffed into corners. You will probably end up closer to your TV/screen too. Which maximises its size as seen from the "hot seat". My IB is off to one side of the left main speaker. I have never been able to locate the IB as the source of the bass because the main speakers steer the apparent source. Do seriously consider 4 x IB15s for safety. It is too easy to run out of cone excursion with only two drivers when watching action films. Particularly in a room of that size.
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Post by slovenian6474 on Nov 18, 2008 16:15:06 GMT -7
I'm in the works of planning a whole home theater setup in a room. I would LOVE to do IB but the only space i would have available is under the stairs which is on the left side of the room. Now the room measures only 12' x 36' and the IB would be placed about 3'-4' from the front of the room. I was thinking of doing 2x IB15s. Is this going to do well? I'm concerned that having on it on the left side of the theater would cause problems. Since this is the only way it would work, it's between putting it there or going with a tradition box sub. I assume you are considering listening and watching along the room's greater length? Would it help your layout to listen across the shorter room dimension? I have been listening across various listening rooms for decades. This layout allows you to space your speakers well apart without having them stuffed into corners. You will probably end up closer to your TV/screen too. Which maximises its size as seen from the "hot seat". My IB is off to one side of the left main speaker. I have never been able to locate the IB as the source of the bass because the main speakers steer the apparent source. Do seriously consider 4 x IB15s for safety. It is too easy to run out of cone excursion with only two drivers when watching action films. Particularly in a room of that size. i was thinking of having a screen come down infront of the bay window at the top to block the light and use with a projector. You're suggesting having the screen come down on the wall facing the stairs? Also having 4x IB15 in that little space under the stairs would be having the subs almost at 1x Vas.
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Eskimo
Full Member
Bass-head
Posts: 143
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Post by Eskimo on Nov 18, 2008 16:28:09 GMT -7
beta.floorplanner.com/projects/18198919Here's a quick mock up of my room. The sub would go in the area under the stairs. I measured the volume under there and it's 4821 liters. The room and under the stairs i think is too small for 4x IB15s. I think you're mis-calculating the Vas of the subs you're considering (which ones, by the way?) My IB is under the stairs as well, and is just about the same size.. The Fi 15's I was considering have a VAS of 281L each- 281 x 4 = 1124, x 4 = 4496L, so you'd have slightly more than 4x VAS with 4 of them, and the Fi's have a larger Vas figure than most. P.S. Chrisbee really knows his IB stuff...
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Post by slovenian6474 on Nov 18, 2008 16:32:56 GMT -7
beta.floorplanner.com/projects/18198919Here's a quick mock up of my room. The sub would go in the area under the stairs. I measured the volume under there and it's 4821 liters. The room and under the stairs i think is too small for 4x IB15s. I think you're mis-calculating the Vas of the subs you're considering (which ones, by the way?) My IB is under the stairs as well, and is just about the same size.. The Fi 15's I was considering have a VAS of 281L each- 281 x 4 = 1124, x 4 = 4496L, so you'd have slightly more than 4x VAS with 4 of them, and the Fi's have a larger Vas figure than most. P.S. Chrisbee really knows his IB stuff... AE has the Vas as 439L. 439 x 4 = 1756. 1756x4=7024. Plus you have to take into account that after installing 4 of these drivers and the manifold, i won't have 4821L under there anymore. Edit: The room really isn't a big room. Would 2x IB15s not be enough?
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Post by ThomasW on Nov 18, 2008 17:09:02 GMT -7
Would 2x IB15s not be enough? It's on the low end for displacement. Realistically I think a better choice in this situation would be a pair of Fi IB-18"s
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Post by slovenian6474 on Nov 18, 2008 17:13:34 GMT -7
Would 2x IB15s not be enough? It's on the low end for displacement. Realistically I think a better choice in this situation would be a pair of Fi IB-18"s My math is crazy today. Updated the room, it's 12'x26' not 12'x36' How much do those run? Edit: looked it up. Runs about the price as 4x IB15. Any place to get them cheaper than msrp? Also what are the specs on those? the site doesn't really show them.
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Post by ThomasW on Nov 18, 2008 17:54:55 GMT -7
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Post by slovenian6474 on Nov 18, 2008 18:04:04 GMT -7
Alright. I was thinking more along the lines of used drivers....but who takes OUT their IB subs!? lol. I'll have to measure and make sure i can actually fit them in there, but i don't see it being a huge problem, just some engineering and finagling. Would a Behringer Ep-1500 be enough to power 2x FI IB3 18"?
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Post by ThomasW on Nov 18, 2008 18:08:40 GMT -7
Would a Behringer Ep-1500 be enough to power 2x FI IB3 18"? Yes
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Post by slovenian6474 on Nov 18, 2008 18:13:30 GMT -7
Would a Behringer Ep-1500 be enough to power 2x FI IB3 18"? Yes Excellent. I checked under the stairs and i have a 2x4 that supports the stairs directly in the center of the wall. Would it be bad to have it off center (towards the corner of the room)? Also would my original idea of having the screen at the top of the room and having the sub come in on the left side be bad?
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Post by ThomasW on Nov 18, 2008 18:45:10 GMT -7
I checked under the stairs and i have a 2x4 that supports the stairs directly in the center of the wall. Would it be bad to have it off center (towards the corner of the room)? Also would my original idea of having the screen at the top of the room and having the sub come in on the left side be bad? If this is an unfinished area it would be best to use headers and relocate the 2X4 so the drivers can be further toward the front of the room. The rest of the plan seems fine.
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Post by slovenian6474 on Nov 18, 2008 19:06:11 GMT -7
It's finished area. There's a 2x4 that supports the stairs, but the whole wall has the standard spacing for studs. The perfect spot to put it in with the least modification is about 3 feet from the top of the room.
Now for manifold, would a 20"x20"x20" cube with a IB3 18" on either side be good? What's the method for calculating manifold dimension?
Also thanks a TON for helping me out, guys. I'm probably going to spend WAY more than i want to on this theater but at least i won't be saying "eh, it sounds good" when it's done.
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Post by ThomasW on Nov 18, 2008 19:18:15 GMT -7
Now for manifold, would a 20"x20"x20" cube with a IB3 18" on either side be good? 20" or so high, 20" or so deep (adjust size so mounting the drivers is easy, and wide enough to match up with the existing stud spacing.
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Eskimo
Full Member
Bass-head
Posts: 143
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Post by Eskimo on Nov 19, 2008 7:15:35 GMT -7
I will tell you from experience that with the 18's, 20"H or D on the manifold doesn't leave enough room to get holes completely though the manifold so you can use t-nuts to secure the clamps, in 4 of the 8 locations. I had to just use big honkin' screws (I think I used #12's) into the wood for that on mine.
If you'd like, I will measure my manifold tonight and let you know what the *minimum* dimensions need to be to have clearance.
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Post by slovenian6474 on Nov 19, 2008 12:10:11 GMT -7
that would be excellent, eskimo. thanks.
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Post by slovenian6474 on Nov 19, 2008 18:51:23 GMT -7
should i get the 2 ohm or 4 ohm drivers?
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