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Post by eratcliffe on Nov 2, 2006 19:43:37 GMT -7
Hi guys i have been reading a lot about ways to install an IB. I want to put one in my living room the only problem is placement (the usual problem as i have read). The room is 25 x 20 with 20ft ceilings and a very open floor plan so we are talking a room volume upwards of 12000 cubic feet. the only place i coud do an IB install would be the ceiling but i can get it above the front speakers and tv. My only other alternative is to build it under the stairs which would be directly on the left on the listening position,but would not be 20ft in the air. I understand this is not ideal but can i align the phase some how to compensate and not be able to localize the position of the subs as easily? My fronts and center all have built in subs (def tech) would i be able to crossover the IB real low like 40hz or lower to help limit the localization? Any suggestions would be greatly appreciated.
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Post by ThomasW on Nov 2, 2006 22:31:51 GMT -7
The answer is to test the proposed locations. I realize isn't the easiest thing to do, but it's the only way to know if they'll work.
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Post by jagman on Nov 3, 2006 18:35:14 GMT -7
Localization shouldn't be a problem for the ceiling location, but directly to the left of the seated position may cause problems. Even if the cut off is 40Hz, there still will be a stiff breeze coming from the left! I hope you understand how many drivers you'll need. You may be able to get away with 4 15's or 2 18's if you do the side location. 4 high excursion 18's will be the absolute minimum for the celing location. I wouldn't be surprised if you end up needing 8. If you do that, I would highly recommend doing them in a manifold. Can you imagine the stress on the structure of the house if 8 high excursion 18's were in a line array   . I have 2 high excursion 18's in a room 1/4 the size of yours. Couple that with the fact that you will potentially sit twice the distance from the IB suggests 8 really would be the minimum. Unfortnunately there really is only one way to tell. Measure twice, cut once. |
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Post by eratcliffe on Nov 4, 2006 9:31:21 GMT -7
jagman thanks a lot of the info. I think i am going to build a box sub out of some stuff i have laying around and test some before i make the leap into the ceiling ib. ultimately this is what i want but 8 fi 18 will run a pretty penny. I have already decided manifold would be the only feasible way for me. I may start with 4 dayton ib 15" or 2 fi 18"s unless you have a better suggestion for high excurison 18"s? or 15 for that matter. I know thomasw uses 12 12" subs I assume it doesn't matter (assuming correct t/s parameter speakers are used) and that it all really equates to displacement, correct?
thanks again for the input
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Post by ThomasW on Nov 4, 2006 11:08:44 GMT -7
The room is MASSIVE, so you're going to need a ton of drivers/displacement. Take a look at Paul Wright's 'Gemini' setup. His room is about the same size as yours. The picture of the opening high up on the wall will give you an idea as to the scale of his room You have the benefit of being able to buy the Fi 18"s. There weren't any 18"s available when Paul built his IB. If you want I can put you in contact with Paul so you two can compare notes. This is his second IB... www.geocities.com/pnwright3/Gemini_subs.html |
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Post by eratcliffe on Nov 4, 2006 16:29:25 GMT -7
thanks for the link I am going to have to do some research and listen to different placements before i decide if will be the best option to use the ib
i appreciate the help and will post progress reports when i get moved in the house ina few weeks and have more time to experiment
thanks again
eric
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