MFW-15 Project Advice Needed - Page 4 - AVS Forum
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post #91 of 100 Old 12-14-2012, 06:18 PM
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Quote:
Originally Posted by Tom Bley View Post

I have 8 MFW-15's that I purchased from Erich H in July 2011 that I still have not done anything with.

Oh that's so tempting. I would love to convert my four MFW-15 sealed boxes to dual opposed. The damn things need to be chained down to keep them from walking across the room.


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post #92 of 100 Old 12-14-2012, 07:42 PM
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Quote:
Originally Posted by petew View Post

Oh that's so tempting. I would love to convert my four MFW-15 sealed boxes to dual opposed. The damn things need to be chained down to keep them from walking across the room.

biggrin.gif How do you like the 4 you have now?
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post #93 of 100 Old 12-15-2012, 05:48 AM
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I couldn't be happier with them. Best bang for the buck HT upgrade I've ever done. I'm running them 3 to 5 dB hot and they have no trouble keeping up, even with my low power amp. I don't usually listed at reference though.

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post #94 of 100 Old 12-15-2012, 08:25 AM
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Quote:
Originally Posted by petew View Post

Oh that's so tempting. I would love to convert my four MFW-15 sealed boxes to dual opposed. The damn things need to be chained down to keep them from walking across the room.
I have 2 dual opposed and they don't move at all.

Nice setup.

Builds: Maelstrom 21 Ottoman Build, Dual Opposed MFW's x 2, Statements, SEOS-12/TD12M x 5. 
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post #95 of 100 Old 12-15-2012, 08:28 AM
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Rubber feet will keep them from walking around. I have to use it on my sub upstairs for the same reason and it's 140lbs lol

Blasting brown notes for 10 years and counting!

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post #96 of 100 Old 12-15-2012, 08:29 AM
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Quote:
Originally Posted by pgwalsh View Post

I have 2 dual opposed and they don't move at all.
Nice setup.

Thanks!
I get amazingly flat response with four boxes and no EQ. I need (want) more DIY speakers!
Quote:
Originally Posted by N8DOGG View Post

Rubber feet will keep them from walking around. I have to use it on my sub upstairs for the same reason and it's 140lbs lol

I'll probably staple some area rug underlay padding to the bottom feet. Should do the trick.

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post #97 of 100 Old 12-15-2012, 04:13 PM - Thread Starter
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What size boxes do you have for yours petew?

Sounds Good to Me... keeping track of my audio projects.

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post #98 of 100 Old 12-16-2012, 07:24 AM
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The boxes are just a hair under 4 ft^3. I built them big to use a 145 watt per channel amp I had on my spare parts shelf. Surprisingly (to me at least), air pressure has a big effect on xmax for a given volume. We're at 5,200' here in the ABQ.

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post #99 of 100 Old 12-16-2012, 09:37 AM
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I haven't heard much talk about altitude's effects. So in theory do you need a smaller box at higher elevation, all else equal?
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post #100 of 100 Old 12-16-2012, 10:10 AM
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Yup, less air to compress, smaller box. There's a field to enter air pressure in winISD. I designed my bracing to let me cut another driver hole in the back baffle to go dual opposed, and I have plenty of box to handle two drivers.

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