MFW-15 - Dual Opposed or Marty Cube style - AVS Forum
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post #1 of 14 Old 03-06-2014, 07:59 AM - Thread Starter
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I recently got some more of these from a friend and want to build a couple cabinets. I know that Dual Opposed has been done with good success before but I used WinISD and they look pretty good in a 7Cube slot ported box as singles now I am sort of torn, any feedback or thoughts? I know this is a blast from the past but I just ran into more of these.
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post #2 of 14 Old 03-06-2014, 01:50 PM
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I'll be interested in what you decide. I still have two more MFW-15 drivers and am trying to decide what I'll do with them. So far I've done two Lilmike Cinema F20's and four dual opposed.
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post #3 of 14 Old 03-06-2014, 03:37 PM
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Cool! What size room are you in and is it open? Can you post your sim in 7cf?

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post #4 of 14 Old 03-06-2014, 10:08 PM
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I've got two mfw-15 drivers collecting dust, too. 😀 I look forward to seeing what you choose and build.

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post #5 of 14 Old 03-07-2014, 03:50 AM
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I have two MFW-15 drivers as well, one of them is still in the stock MFW-15 cabinet from AV123, but, it has a blown amp. I wonder what kind of output and extension could be had out of two separate, large, low tuned, ported enclosures?
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post #6 of 14 Old 03-07-2014, 07:53 AM
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Stogie, depends on your room, but I'd go two LLT's or a pair of F20's. The sim I ran (two drivers ported in 7ft^3 ea., 15Hz tuning, 300 watts ea., 24hz highpass, slot port 15x3x30.25) get's you ~6dB more output over two sealed at 4ft^3 ea. before room gain.

I'm running mine sealed now for space and WAF...really want to build the F20's tho. They pressurize my room pretty good.

There are obviously better drivers out there, but that's what was so cool about the MFW-15's...price/output. I paid $80 ea. for mine. cool.gif

-Nate
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post #7 of 14 Old 03-07-2014, 08:00 AM
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Quote:
Originally Posted by desertdome View Post

I'll be interested in what you decide. I still have two more MFW-15 drivers and am trying to decide what I'll do with them. So far I've done two Lilmike Cinema F20's and four dual opposed.

Cool man. Well, as you know, you'd have to double your drivers to gain 6dB. So adding two more into the mix won't gain you much, perhaps a db or two. You may just wanna go with a pair of sealed to improve FR (if you need to improve it that is). Those must sound awesome btw. smile.gif

-Nate
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post #8 of 14 Old 03-07-2014, 08:16 AM
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Quote:
Originally Posted by robotbunny View Post

Cool man. Well, as you know, you'd have to double your drivers to gain 6dB. So adding two more into the mix won't gain you much, perhaps a db or two. You may just wanna go with a pair of sealed to improve FR (if you need to improve it that is). Those must sound awesome btw. smile.gif

-Nate
The four dual opposed are at WOOlly's Copper Fields Cinema and the F20's are now owned by stormwind13 and recently participated in the Armageddon-Subwoofer GTG Aug 24th 2013, Burnsville MN. I'm just building out another sub either for another room in the house (my son wants it in his bedroom) or for my parents house.
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post #9 of 14 Old 03-07-2014, 08:27 AM
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^ Coo, thanks for the links...looks like they went to good homes. I'd still say LLT or F20 for these drivers, unless the room is good for a pair of sealed. They sound pretty sweet sealed...you know.

-Nate
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post #10 of 14 Old 03-07-2014, 09:25 AM - Thread Starter
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I am going to do 7CU/FT tuned to 20HZ 2" X 17.25" port they are going to to be pretty big but they are going in my basement which is pretty large I can fit them. If they are not enough I will build 2 more eek.gif
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post #11 of 14 Old 03-08-2014, 05:56 AM
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So wrt to the MFW-15 drivers, what would be the best enclosure type & size if you wanted them to focus on the 30hz to 80hz region? The reason I ask, is because I have two MartySubs that cover the sub-20hz stuff great, and being that I have a few of these MFW-15's lying around, I might as well do something useful with them!
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post #12 of 14 Old 03-08-2014, 02:40 PM
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I have a pair of MFW-15s sitting round too. I am going to be building end table subwoofers with them in a 3cuft sealed box/table. They'll be placed on each side of the couch / back corners of the theater room to provide backup support for my two sealed SI-18s in the front.

It's probably overkill for my 14x20 room, but...... biggrin.gif:D:D:D
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post #13 of 14 Old 03-09-2014, 05:06 AM
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What would be a good enclosure size for a single, large, low tuned MFW-15 cabinet?

I have two of these drivers and a spare Crown XLI2500 that I have been wanting to do something with. They would have to play nice with my other MartySubs that utilize the Dayton HO18's in the original MartySub. That might be an issue. I am powering my MartySubs with a regular non-dsp version of an iNuke3000. So I might have to pick up a balanced MiniDsp 2 by 4 with the advanced plugin.

Is it possible to build a ported enclosure that would get more output, and/or extension than the stock enclosure for the MFW-15? If so, what would be the optimal enclosure specs?
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post #14 of 14 Old 06-21-2014, 07:25 PM
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Hey guys,

I am helping out a friend and replacing the amp that went out on his MFW-15 in the stock AV123 enclosure. I'd like to set up a HPF to keep the driver from reaching excursion limits with the Crown XTi 1000 that I'll be using. What should I use? HP Butterworth 24 db/oct? Set at 22Hz? He is a VERY casual listener and I'd like to set it up to be as bulletproof as possible for him. Thanks!
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