Excessive IB: Help Wanted! - Home Theater Forum and Systems - HomeTheaterShack.com

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post #1 of 24 Old 02-10-11, 12:12 AM Thread Starter
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Excessive IB: Help Wanted!

Hello fellow Bassheads,
I find myself in the middle of a ported build for my modest HT setup, but I have the need to plan another.

Personal Build:http://www.hometheatershack.com/foru...0w7-build.html

Fortunately this next one is not so much on my dime. I must must confess first that I'm in a fraternity, but unlike my stereotypical brothers (some actual), I do have hobbies other than drinking. We are in the final steps of finishing the remodel of a room in our basement. A few others and I have found our current sound equipment inadequate and horrid. It has taken a lot of abuse from being moved around a bunch. So with this room, we're building in a sound system. I'll look for ideas for mains elsewhere, but the reason I'm here is bass.

I had originally been looking into a Peavey 18" 2400W sub powered with a large Crown (I'll find an amp for the IB easy enough in the budget, so thats a non issue). I did these plans last fall before I really knew better than pro audio. It says that its response goes to 50Hz and is -10dB at 30Hz! seems unacceptable to me.

Since I'm pretty handy with the woodstuffs, I'm looking into an IB. Theres a sufficient sized storage room on one wall with the rest being block with a concrete floor. The ceiling is a double layer of hardwood. This seems as close to a concrete bunker as you can get without planning it!

Heres the room:







Here's the general area that I'd do the manifold opening, but most of that wall works.


A bit o' Eye candies


So for better or worse, the majority of the music will be technoish or bass intensive stuff. I've been reading a bit and the perceived loudness of an IB seems to be highly subjective and differs a lot from person to person. And seeing as most uses are HT, can anyone give a good opinion on the IB effectiveness in this type of application? Will people dance to it as they would a traditional sub? Or should I just go with the commercial option?

A huge benefit I'm selling on this to the guys who've never heard of such a thing is the space gains we get from removing the sub box from the room. I think I can easily get a budget around $600-800 for drivers. I could push closer to 1k if it would justify a significant increase in performance.

So I'm open to all suggestions. I looked at some Ficar, Dayton, AE, and M5 drivers. They all seem good. I'm not really knowledgeable enough in IB design to really compare 4 15"s vs. 2 18"s and so on. WinISD-pro_alpha wont let me edit my database (Vista-64bit) so I can't simulate the drivers not in the existing database.

Thats all I can think to share besides the guys are used to 500W of a peavey amp going into this i think http://www.peavey.com/products/proau...(r)%20118.html
Ipod/laptop goes right to the amp which has a crossover. Beat up PV monitors for mains. People like this setup. I wanna blow them away!

Thanks Gents! (Build thread promised!)

Last edited by Tom Grimes; 02-10-11 at 12:22 AM. Reason: doubled a picture
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post #2 of 24 Old 02-10-11, 12:19 AM
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Re: Excessive IB: Help Wanted!

Three things we need to know are the size of the room, the size of the back space, and how much you want to spend on subs and amps.




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post #3 of 24 Old 02-10-11, 12:33 AM Thread Starter
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Re: Excessive IB: Help Wanted!

oops sorry!

Main Room = 13X25X9 = 2925 ft^3

Back Space = 14X10X8 = 1120 ft^3 -- My initial reading says this is enough for a decent number of drivers, Correct?
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post #4 of 24 Old 02-10-11, 12:36 AM Thread Starter
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Re: Excessive IB: Help Wanted!

Subs $600-$800. Maybe 1k if I have to.
And Amps don't really matter to a point. I can use enough of my personal amps and friends equipment to power just about anything. So once it works well, money wont be an issue to keep these running.
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post #5 of 24 Old 02-10-11, 12:38 AM
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Re: Excessive IB: Help Wanted!

That should be plenty of backspace as ech subs needs 10 times the vas of the driver.
I would start of with a couple of ficar 18in IB subs and work from there.

Matt

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post #6 of 24 Old 02-10-11, 12:48 AM Thread Starter
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Re: Excessive IB: Help Wanted!

In your opinion, would this be enough output to satisfy a party and dancing scenario?
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post #7 of 24 Old 02-10-11, 07:21 AM
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Re: Excessive IB: Help Wanted!

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In your opinion, would this be enough output to satisfy a party and dancing scenario?
Based on what I've read of IB (constantly learning) -- 2 FiCar 18 IBs should be pretty substantial. I know that some people will build a second manifold down the road --- or simply build the first manifold for 4 drivers - so there is room for future expansion.

I've read a number of threads about people debating between 4 15" AE IB speakers - or 2 Ficar 18"s... and I think there is a tendency to go with the 18"s since they're simply bigger drivers and can move more air.


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post #8 of 24 Old 02-10-11, 07:24 AM
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Re: Excessive IB: Help Wanted!

If this is technoish or bass intensive music only and no movies then a 25 hz lower limit would be enough. Would you agree?




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post #9 of 24 Old 02-10-11, 07:32 AM
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Re: Excessive IB: Help Wanted!

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Mike P. wrote: View Post
If this is technoish or bass intensive music only and no movies then a 25 hz lower limit would be enough. Would you agree?
Yep, I would...


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post #10 of 24 Old 02-10-11, 11:34 AM Thread Starter
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Re: Excessive IB: Help Wanted!

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If this is technoish or bass intensive music only and no movies then a 25 hz lower limit would be enough. Would you agree?
I would say that should be sufficient.

Does cutting it off there with the HPF get rid of the most high excursion frequencies? Which then enables a higher power handling and therefore increased output in the given frequency range? This is my understanding of the relationships involved at this point.

We had considered setting our projector and screen in there on occasion, but the rest of the system wont be optimized for it either. I certainly wouldn't be unhappy with the system if it was only set up for music, and I doubt anybody else would even notice on the off chance a movie goes through it.
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