crazy me, 3rd subwoofer,,want a proven design - Page 2 - diyAudio
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Old 27th October 2013, 03:07 PM   #11
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You could firstly work on a LT-filter, it's cheaper, but the SPL will be limited to the drivers' Xmax, that can be simulated on Unibox.

If not satisfied, then a 3rd subwoofer is the way to go.
12" Ultimax is an excellent driver, I'd stick to it, and having a vented box with it.
Be prepared, you will need volume to reach the shaking bass, that's the trade-off. I'm talking about 7 cu.ft. here, so start working on camouflage plans, under the couch, a footstool. But gives you steady bass until 18hz.

Another option a bandpass enclosure, it will be half the volume, but it won't give that much low fb. (21hz).

cheers
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Old 27th October 2013, 03:14 PM   #12
bjorno is offline bjorno  Sweden
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Hi,

FYI:

b
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Old 27th October 2013, 03:39 PM   #13
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Thanks bjorno. would that be for 2 drivers? I am leaning towards the ultimax (again),,,I am also leaning towards a large vented box as well now. My wife is very supportive to a point. She asked that the enclosure not "tower" over us. Perhaps a 15" ultimax in a vented box, although my price for power may go up then.
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Old 27th October 2013, 04:28 PM   #14
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this would do the trick i suppose. 12 ultimax,,8.4cuft box with two "slotted" slotted ports,,f3 15 Hz or so.
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Old 27th October 2013, 05:42 PM   #15
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Room modes with subs can work for and against you when it comes to getting the most out of what you already have. IMHO, before investing a third sub, you might try moving your existing two subs to different positions in the room. You may be amazed at the difference it could make at your main listening position.
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Old 27th October 2013, 06:23 PM   #16
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Just buy a minidsp box and setup a LT on the sealed subs that you already own, simple as that. Or use the subs you already own and build bjorno's design, you'll be happy with either of them unless all you're really wanting to do is make some sawdust (build something)

MiniDSP 2x4

What is a Linkwitz Transform?
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Old 27th October 2013, 06:28 PM   #17
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I was trying different placements this morning and while i did find a couple that seemed slightly better (not much),,they did not appeal to the wife at all. I like the idea of the LT filter,,but that is a completely new concept to me. If adding such a device, would it be possible to set it up as to switch on or off? I also like the idea of having versatility,,3 subs all independently controlled may be useful for something. When I am making music I sometimes lower or even shut off the subs.
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Old 27th October 2013, 06:29 PM   #18
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also wanting to make sawdust!
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Old 27th October 2013, 06:40 PM   #19
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Quote:
Originally Posted by rockironwebb View Post
If adding such a device, would it be possible to set it up as to switch on or off?
The MiniDSP uses a usb interface to software you install and is pretty easy to use, once the bi-quad filter is entered you can press a bypass button in the interface to do an A/B comparison. I'd probably go with this plug-in 4way advanced if you are using a single SUB output from your receiver, then you have 4 outputs that you can program and go crazy with LT, PEQ etc
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Old 27th October 2013, 06:51 PM   #20
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I'll most likely end up doing it all,,,,,hobbies
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