"The Shadow of the Beast"...Adventures in Closet-Sized Subwoofers - AVS Forum
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post #1 of 236 Old 04-01-2013, 07:25 AM - Thread Starter
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EDIT: This project has taken a turn towards the baddest thing I have seen around here in a while. Skip ahead to page 2 to see where we are headed at this point and tune in!!!!!

The new powerplant will be a single channel of the IPR7500 juicing the RE's with 3750 watts.




Original Idea:

First off is looking at a better door to the storage area it is going in. Second is how I plan to anchor it to the two studs..I have the standard 16" between them, so I thought a box just 16"wide would work just fine, with some serious lag bolts to wratchet it in there.

Full disclosure, I am not positive when I will get to this over the next few weeks but I wanted to go ahead and get some ideas and pointers on how to anchor it to the wall as well as what others with IB's or something in the exact opposite area of their front stage have had to do with Delay and phase and such biggrin.gifbiggrin.gif

For those that don't know why I am doing this, well, I have the RE's sitting around, I have an EPX4000 and a Crown XLS1500 sitting around, and I have a storage closet that would be pretty easy to turn into a giant IB with minimal work. I think. Should something come up that makes this a not-so-easy build, I will probably cancel it since 8 sealed 18's makes me just fine and happy as it is biggrin.gif
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post #2 of 236 Old 04-01-2013, 09:46 AM
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Ddaaaammmmnnn skippy!

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post #3 of 236 Old 04-01-2013, 11:02 AM - Thread Starter
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OK so here is the next quandry:

Looking at amps, I have the epx4000 rated to do around 1900 watts measured in 4 ohm bridged mono. I also have the crown xls1500 which is 1550 watts bridged mono, but that is on the actual crown stat sheet, NOT measured. I wonder if I would be able to run one RE off of each amp and make it work that way? The wattages are technically still pretty close, and I could just adjust out the gains so the epx will just not have to work as hard and match the level of the xls?

Running both off the single berry I would only have the option of 4 ohm stereo, 8 ohm bridged, or 2 ohm bridged which I didn't think was the best idea...

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post #4 of 236 Old 04-01-2013, 11:38 AM
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Honestly, they are so close it would be 1dB or less of a difference. Get two power supplies going between the two of them. wink.gif

It's rear room IB anyway so I doubt you'll even approach the limits of either amp.


I know where you're coming from though. wink.gif

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post #5 of 236 Old 04-01-2013, 12:21 PM
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Thats awesome beast. Let me know if you want pointers
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post #6 of 236 Old 04-01-2013, 01:22 PM
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FTW!

Awesome man. Pics of where this is going?

 

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post #7 of 236 Old 04-01-2013, 01:25 PM - Thread Starter
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They will be coming up. I need to clear out the space and move the rest of my speaker boxes and such up to the attic to make room.

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post #8 of 236 Old 09-12-2013, 07:34 PM - Thread Starter
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Cleared some space, ya know, just for some fun....

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post #9 of 236 Old 09-12-2013, 08:23 PM
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Quote:
Originally Posted by beastaudio View Post

Cleared some space, ya know, just for some fun....


Thats the exact space I have my IB in wink.gif

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post #10 of 236 Old 09-13-2013, 02:10 AM
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Good thing you are going the DO route. A pair of of front firing XXX looks like it would hulk that wall into submission.

Does this mean that another pair of IPR 7500's are on the radar? 7,000+ watts per XXX sounds...appropriate.

I was thinking just now... You should talk Nick into trading your XXX's for a pair if his 24's. I'm under the impression they will start to officially be available after SI gives away the first production model this weekend.

 

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post #11 of 236 Old 09-13-2013, 06:31 AM - Thread Starter
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Haha, not a bad idea! 7000 watts per would be retarted on an IB. Right now they are just going on the other channel of the IPR while I try this out! I agree I could easily use a single IPR for a pair or if I quaded it up, then get close to 2,000 watts per driver, but free space, they ought to move pretty easily!

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post #12 of 236 Old 09-13-2013, 08:10 AM
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Beast, are you using GH's as well? Or are you running DO SI's up front like your pic?
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post #13 of 236 Old 09-13-2013, 08:18 AM
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Quote:
Originally Posted by beastaudio View Post

Haha, not a bad idea! 7000 watts per would be retarted on an IB. Right now they are just going on the other channel of the IPR while I try this out! I agree I could easily use a single IPR for a pair or if I quaded it up, then get close to 2,000 watts per driver, but free space, they ought to move pretty easily!

Oh man, what was I thinking... IB. Of course.

My bad!

 

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post #14 of 236 Old 09-13-2013, 08:21 AM - Thread Starter
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Quote:
Originally Posted by MKtheater View Post

Beast, are you using GH's as well? Or are you running DO SI's up front like your pic?

Ive got 4 of the SI's up front at the moment in the two sono's. I still have 4 others that I need to get back in but I wanted to try out this IB just for some fun smile.gif Who knows, I might get hooked and end up with six of those 24's in the back of my theater. biggrin.gifbiggrin.gif

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post #15 of 236 Old 09-13-2013, 08:31 AM
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The only problem with multiple big drivers is that you need lots of space! I think each driver calls for 127 cubic feet of an enclosure for IB but of course you can go smaller and lose maybe .5 dBs at 10hz and you can also use more power.
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post #16 of 236 Old 09-13-2013, 09:17 AM
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Quote:
Originally Posted by beastaudio View Post

Cleared some space, ya know, just for some fun....


Quote:
Originally Posted by popalock View Post

Good thing you are going the DO route. A pair of of front firing XXX looks like it would hulk that wall into submission.

Does this mean that another pair of IPR 7500's are on the radar? 7,000+ watts per XXX sounds...appropriate.

I was thinking just now... You should talk Nick into trading your XXX's for a pair if his 24's. I'm under the impression they will start to officially be available after SI gives away the first production model this weekend.


Quote:
Originally Posted by beastaudio View Post

Ive got 4 of the SI's up front at the moment in the two sono's. I still have 4 others that I need to get back in but I wanted to try out this IB just for some fun smile.gif Who knows, I might get hooked and end up with six of those 24's in the back of my theater. biggrin.gifbiggrin.gif

Yeah maybe try out what you have now and put them glorious XXX's to good use.

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post #17 of 236 Old 09-13-2013, 10:20 AM
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Very cool little project Beast
Quote:
Originally Posted by MKtheater View Post

The only problem with multiple big drivers is that you need lots of space!

Yes indeed. Even a single driver can benefit greatly from a full IB alignment.

I'm very fortunate in this regard. My quad IB backspace dissipates into the entire attic volume of a sprawling ranch home. In addition to the massive cubic volume, the slanted roof pitch, combined with the thickly insulated environment, is simply a wonderful set of beneficial acoustic circumstances. I highly recommend it. That said, I know everyone has their particular envelope of possibilities, and we all work with what we've got.

Staying tuned, I always enjoy what Beast has to offer.

Best of luck

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post #18 of 236 Old 09-13-2013, 10:47 AM - Thread Starter
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Thanks guys, I hope to get some work done on it this weekend for sure. I hope to have the wire run this evening if I have time and then Saturday is football and fabrication day. smile.gif

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post #19 of 236 Old 09-15-2013, 03:52 PM - Thread Starter
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Well didn't get quite as much done as I had hoped this weekend, but did get the wire ready and subs in there.


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post #20 of 236 Old 09-15-2013, 06:52 PM - Thread Starter
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Couple questions about sealing off the room....

I am planning on fully insulating the wall, pink fluffy all around, and I also can put some studs horizontal to try and brace the wall against the adjacent cinderblock footing for the other part of the house, if it is needed. The entire closet is basically the space you see, 3 feet wide or so, with the steps declining to the theater, and then about 20 feet long. Plenty of room, but the two issues I am assuming I need to address is the door, and above the sheetrock where the closet opens to the shared drop ceiling. First the drop ceiling: There is no ceiling in the closet, so when I look up I can see where the sheetrock stops and there is an opening to the area above the drop ceiling on the other side of the baffle wall. Now this area isn't immediately shared with the theater as there is a wood footer that partitions the theater area drop ceiling from the rest of the basement. For this reason I don't know if it as big of an issue as otherwise it should be. All of the space above the drop ceiling in the theater is heavily insulated as well (between floor joists and then additional insulation that I put up in between the joists and the grid). Anyways the big questions are:

1) Do I need to seal this area off as good as I can?

2) Does it actually effectively make the "size" of the room bigger with that additional space I am gaining by leaving it open and therefore benefit the IB design?

Then the door to the room. I plan on running some gasketing all the way around the door to help with vibrations and such, but there will still be a gap at the bottom of the door and the floor. This door is a good 15 feet away from the theater area and is located in the small hallway off of the back of the theater. I can try and seal up the bottom gap if it is needed but once again:

3) Is sealing up the bottom of the door that important when it is that far away from the actual speaker (~10 feet)?

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post #21 of 236 Old 09-15-2013, 07:37 PM
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I would try and seal off any backwave from the drivers as best as possible especially considering they are all in the same room. If maybe the door was around a wall and not open to your HT space it would be less critical. That being said, trapping the backwave seems to be a pretty integral part of the IB installation. Personally, I would do all I can to control airleaks. Within reason of course. I wouldn't go super crazy. Your door, for example, maybe just use a simple weatherguard bottom ...umm.. thingie. tongue.gif I like the idea of a couple 2x4's for extra rigidity. Good idea.

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post #22 of 236 Old 09-15-2013, 07:53 PM - Thread Starter
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Door isn't open to the theater really but rather the back hall that comes off the theater. I get your point though. The door should be easy, it's the tiny gaps between each stud open to the crawlspace that would be tough.

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post #23 of 236 Old 09-15-2013, 08:14 PM
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not sure if you have given any thought to something like this, but it is the kind of thing mark was experimenting with in the terraform.

6th order bandpass, where you could use either a passive radiator or a big port for the front chamber and a regular port for the rear chamber because the rear chamber is huge, the port can be reasonable in length.

for the xxx driver, you'd pick up about 16db vs. sealed at the tuning frequency and with only two of them, you could be up in the 128db ballyard from 10-20hz which is what i figure you are shooting for with this build.

not trying to complicate your life, just thought i'd kick the idea out there for you to consider.

here is "max spl" single driver, giant 6th order vs. infinite baffle

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post #24 of 236 Old 09-15-2013, 08:15 PM
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and the frequency response (the sealed is overshooting xmax in that one somewhat under 17hz...)


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post #25 of 236 Old 09-15-2013, 08:22 PM - Thread Starter
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Holy crap! That is insane! But I would be giving up basically everything above 20hz essentially? And I'd have to make a 20cuft front box instead of just firing into the room? I'm not exactly sure how I would build that I guess.

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post #26 of 236 Old 09-15-2013, 08:31 PM
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actually, the ports wouldn't be too bad on that strange sub. 12" diameter x 23" on the rear chamber, 12" x 29" on the front chamber.

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post #27 of 236 Old 09-15-2013, 08:32 PM
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one way that it could work would be to build a wall in your under stairs area making it into two chambers, the front and the rear.

each chamber would then have a port that fires into the room.

so from the perspective of the room, just two holes in the wall.

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post #28 of 236 Old 09-15-2013, 08:34 PM
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the idea here is that you already have enough bass down to 30hz, the "high end -6db point" of this system. then this thing would pick up and add to from there down.

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post #29 of 236 Old 09-15-2013, 08:36 PM
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i'm actually really digg'n this idea. it kind of builds on the late kw's use of his closet to create a monster ported cab. here, we are just taking the idea to a high level of sophistication/refinement.
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post #30 of 236 Old 09-15-2013, 08:43 PM
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Hmmm... maybe a candidate for an SLLT?

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