crazy me, 3rd subwoofer,,want a proven design - Page 3 - diyAudio
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Old 27th October 2013, 07:57 PM   #21
DrDyna is offline DrDyna  United States
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Quote:
Originally Posted by TundraLTD View Post
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
Just be warned, if you end up using a MiniDSP, make sure that the amplifier you're planning on driving the subs with has an input sensitivity in the 0.7-0.8 vrms range.
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Old 27th October 2013, 09:21 PM   #22
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It doesn't cost you nothing, bjorno option (#12) is using your (2x) drivers. (Read in the comment line.)
Q: What amp are you using. There's a huge difference from sealed to BR like from 3x more power for max excursion.
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Old 27th October 2013, 09:37 PM   #23
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currently have 2 bash 500 amps.I assumed the bjorno option was in addition to what I have. I will have to convince the wife to accept a nearly 6 foot tall enclosure in the living room
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Old 28th October 2013, 01:23 AM   #24
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Well buying a miniDSP and playing with it is an excellent start.

It's ready to use, plug in your computer, setup the filters, you're good to go.

Also have a look on Dr. Geddes' studies on multiple subs, he's been using the 3 sealed subs configuration, with proper eq and placement, they will rock!
Building yet another subwoofer, yet another point of source would make sense in the 90s, nowadays the knowledge on this matter is so diffused, also technologies on DSP and measuring with quality are so cheap. Science is your friend and much available.

With a calibrated mic, also available for 60 bucks, you can measure up your system's response, decay, etc, then really plan on improvements, such as acoustic treatment, placement, etc.

Less is more my friend.

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Old 28th October 2013, 05:53 PM   #25
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Originally Posted by rockironwebb View Post
currently have 2 bash 500 amps.I assumed the bjorno option was in addition to what I have. I will have to convince the wife to accept a nearly 6 foot tall enclosure in the living room
IMHO, you haven't verbalized what your trying to accomplish with a third sub. I'm sure that the two sealed Ultimax 12 subs you currently have are more than enough(maybe with some EQ tweaking) for listening to any music genre.

If your aiming at trying to get to the lowest octaves and to partially pressurize the room for HT listening why not consider the Ultimax 15 or the consider the Dayton Reference 18 in a downfacing table/end table configuration that's wife friendly.

Either of the above choices will get you those lower octaves and shake the pictures off the walls - just adding a third Ultimax 12 sub in any configuration will not

You could opt for bass shakers in the furniture instead, but again IMHO, I don't like them as they become annoying and distracting very quickly compared to what I proposed above.

Last edited by Cokewithlime; 28th October 2013 at 06:03 PM.
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Old 28th October 2013, 06:40 PM   #26
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I desire a system that is capable of playing all frequencies loud and clear. HT, music listening and music production. As a previous poster said,, I also want to make some sawdust. Designing and building these speakers give me a tremendous amount of joy and satisfaction. While I do have some money to burn I am also budget minded, if I were to build for an ultimax 15,i would feel that I would want to go from a 500 amp to a thousand watt amp,, which would add costs.
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Old 28th October 2013, 06:57 PM   #27
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I don't mind over doing things.
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Old 28th October 2013, 08:58 PM   #28
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Quote:
Originally Posted by rockironwebb View Post
I desire a system that is capable of playing all frequencies loud and clear. HT, music listening and music production. As a previous poster said,, I also want to make some sawdust. Designing and building these speakers give me a tremendous amount of joy and satisfaction. While I do have some money to burn I am also budget minded, if I were to build for an ultimax 15,i would feel that I would want to go from a 500 amp to a thousand watt amp,, which would add costs.
All the subs don't have to cover the same range which is why I also suggested combining what you already have with the Dayton Reference 18 - it will get you down to those lower octaves and because it's about 5db more efficient, sensitivity wise, than your Utimax 12's it will play to the same output level(and more) as your Utimax 12's with just the same 500W plate amps that you are already using.
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Old 28th October 2013, 09:05 PM   #29
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Maybe removing the drivers and building another boxes?

I see you have followed the orientation from Partsexpress the 2 cu.ft. sealed box.

I'd build two vented enclosures, this Bash 500w should be enough to drive the Ultimax 12, coils wired in series (6,6 ohms) so pushing them at 300w, giving 108,5 dB.

Something like the image attached, there's a little boost 2,5dB at the end I know, I've been using mine like this with a 3dB boost, but I don't use the sub on the corner. According to Geddes middle-sideways gives a good excitation for the room.

cheers
Attached Images
File Type: gif VB Excursion Dayton Ultimax 12.gif (24.8 KB, 118 views)
File Type: gif VB Response Dayton Ultimax 12.gif (38.1 KB, 117 views)
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Old 31st October 2013, 02:37 AM   #30
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Thanks for all of the input so far. My stubborn self is going to proceed with building a 3rd sub. The building is as enjoyable to me as the final product. I'm only a couple of years into this hobby and as I go I will branch out and try the different things recommended to me. i will build a 15" vented sub this time around. I'm already looking at the dayton reference hf and another bash amp. At this point in my hobby I enjoy the ease of a plate amp. I thought about re building the current sealed boxes but I really do like the "punch" that they provide.
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