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Mfw-15 Clone Project

post #1 of 120
Thread Starter 
Ok so with all the mfw-15 parts flying around for pretty cheap I decided to do a diy clone. I have an mfw to get dimensions off of........

It should be a pretty good performer for money invested. I have a couple bad v2 amps which I'm gonna do a cap replacement. This is planned to be my brothers christmas!!!!

I've been asking around about this for a while guess I'll just do it myself and see how it turns out. Worst case scenario I end up with some extra mfw parts which can't be a bad thing
post #2 of 120
Thread Starter 
It has begun.....

post #3 of 120
Thread Starter 
So my hats off to the original designer...... The folded port is kinda a pain to get right.

I had to calculate the inside dimensions because I could not reach the back corners and I'm not using 1" mdf so the inside dimensions would have been different if I'd used the outside......

Measured port diameter width and length and inside dimensions(minus port).

Gotta do some gluing..........
post #4 of 120
Thread Starter 
Updated pics.....

Trace it out...



All cut and loose fit...


Through the driver cutout....


Port to back wall Bracing.....


Port to top bracing.....


Bracing and deadening....


Half the port assembled shot through the driver cutout.....
post #5 of 120
any updates... dying to know how if compares to your original....checked out your diy theatre pics... looking nice...thx
post #6 of 120
Thread Starter 
Shoot, almost forgot about this thread, better update....

Glue up....


Test Fitting....


Finished cab....


Recessed for electronics....


Assembled and took some preliminary numbers... This is the location I took the measurements....


The numbers were pretty close to the original from 20hz-80hz within 1-2db back and forth. The one I built actually had a slightly flatter response, I added some bracing and resonance control. The original peaked about 1-2db through the midbass region which could have been location, resonance, idk...
post #7 of 120
Nice build!

Which one is which??
post #8 of 120
very nice! Impressive wood working there. Do you plan on veneering?
post #9 of 120
Thread Starter 
Quote:
Originally Posted by slickwilly8 View Post

very nice! Impressive wood working there. Do you plan on veneering?

I'm trying to keep the price to a minimum on this one since its a gift, but if/when I build another I will prob go sharp corners and some kind of veneer......

I primed today prob should take some pics and share.....
post #10 of 120
Thread Starter 
Primed....
post #11 of 120
Thread Starter 
I decided to use gloss Black on the driver recess and port mouth(kinda like the original) and satin black everywhere else...... Pics don't do how good this thing looks in satin black justice. I gotta get at least 3 more coats and install electronics/driver by sun night!!!!!!!!

post #12 of 120
Looking good!

Since these are no longer being manufactured/sold and the company is out of business, it would be kind of cool if someone took one apart and made DIY plans for it. I've always wanted to hear one of these subs.

Where do you find all the parts for these though? Any time I've checked ebay,. there has been 0 listings.
post #13 of 120
Love this! Great job my man.
post #14 of 120
Thread Starter 
Danny at Gr research has drivers, murrel on here has amps. Enclose to about 3.0 ft^3 and tune to 19-20hz.
post #15 of 120
Thought I'd ask what the amp looked like. I have a MFW-15 and it started to make a funny noise and I'm worried that it's the amp. Also, is there a pre-amp to boost the input signal or is the input signal already high, so the amp is really a power amp? There reason why I ask is that I have some high quality (B&K) amp parts (105w) that I was wondering could be used to replace the amps.
post #16 of 120
What are the dimension / measurements so another could cut a box?
post #17 of 120
Quote:
Originally Posted by Jinjuku View Post

What are the dimension / measurements so another could cut a box?

Posted what I could get for you in the other thread that you asked this. The DIY Sub 200-250 build thread. The length of the port is going to be tricky like the pics in this thread showed.
post #18 of 120
Thread Starter 
Quote:
Originally Posted by Jinjuku View Post

What are the dimension / measurements so another could cut a box?

Yes I plan on posting better cut info I'm gonna build at least 2 more of these I just need to polish up my notes its coming.....
post #19 of 120
Nice job!

Congrats on a nice build!
post #20 of 120
Thread Starter 
Quote:
Originally Posted by jpmst3 View Post

Nice job!

Congrats on a nice build!

Thanks! I got two mire of these to build so should have A pretty detailed thread by the time were done.......
post #21 of 120
Any update on the notes? I'm looking grab a couple of the drivers soon and would love to know the enclosure volume, port area and length of the original MFW-15.
post #22 of 120
Thread Starter 
Quote:
Originally Posted by ngreene View Post

Any update on the notes? I'm looking grab a couple of the drivers soon and would love to know the enclosure volume, port area and length of the original MFW-15.

sadly I haven't finished them, have you seen the dual opposed build thread? That looks to give a LOT more extension, but output(max SPL) is considerably lower......
post #23 of 120
Quote:
Originally Posted by NicksHitachi View Post
sadly I haven't finished them, have you seen the dual opposed build thread? That looks to give a LOT more extension, but output(max SPL) is considerably lower......
I have, but right now I'm really looking for a pair of 15's and for the price this should be hard to beat. I will probably try a single box, dual opposed sealed, but also want to try to duplicate the original MFW-15 enclosure, just with an external pro amp for power.

When you have time to finish up your notes, it would be great if you posted them here.
post #24 of 120
looks good nick.

your sig is one of my favorites.

your build actually raises an interesting port question, perhaps mark seaton can weigh in.

the panel that forms the back wall of the first bend is not shown in post #6. if it were left out there would be a cavity back there. what effect would that have on the tuning?
post #25 of 120
Thread Starter 
Quote:
Originally Posted by LTD02
looks good nick.

your sig is one of my favorites.

your build actually raises an interesting port question, perhaps mark seaton can weigh in.

the panel that forms the back wall of the first bend is not shown in post #6. if it were left out there would be a cavity back there. what effect would that have on the tuning?
Thanks!

the cavity should increase port area and lower tuning, right? wouldn't it be a bad idea having the port changing dimensions and such? Seems like it would make more port noise......

Anyways I put it in, just not in the pic you mentioned....
post #26 of 120
i saw it on your drawing layout, so i assumed that you put it in.

your picture just raised the question in my head. i'm not sure that it would make any difference which is why i posed the question. it would raise the mass of the air in the port, but it wouldn't increase the length. that would seem to lower tuning. lowering tuning without making the port longer would be an interesting and useful finding.
post #27 of 120
Thread Starter 
I wanted to finish up this project. I had intended to build a couple more of these, but I have decided on another project. I'm going to sell off the MFW amps I have and go with multiple sealed versions.

So to wrap this up I wanted to post a drawing I put together. Its not fancy or to scale but will give the outline of how to assemble the sub. I have the dimensions at home and I will post the cut list with dimensions later, maybe this weekend. I have numbered all the pieces with unique numbers unless there are multiples of that cut. There are a total of 14 critical pieces not including the extra bracing I added in the enclosure and port.

Here you go......

Here is the Cut Sheet:

1. 16 3/4"X19 1/4" X2(Double Baffle)
2. 16 3/4"X17"
3. 16 3/4"X7" Round over along one of longest sides
4. 16 3/4"X22"
5. 16 3/4"X4" 45 angle both ends measured short to short
6. 16 3/4"X2 3/4" 45 angle both ends measured short to short
7. 16 3/4"X8 1/8"
8. 16 3/4"X8 1/2" 45 angle both ends measured short to short
9. 16 3/4"X12 7/8" Round over along one of longest sides
10. 16 3/4"X12 7/8" 45 angle both ends measured short to short
11. 16 3/4"X21 1/2"
12. 16 3/4"X22"
13. 23"X22"
14. 23"X22"

Driver Cutout: 13 7/8"
Driver Recess: 15 7/8"

Port Dimensions 1 1/2" X 44 1/2"

Internal Volume 2.75-2.9 Cubic feet.

While these cuts are accurate just a few notes:

I would assemble the Front baffle and mount to the left side(facing woofer) and the top. This will let you start work on the inside bracing and port assembly without having the back and bottom in the way. While the cuts above worked for me, adjustments should be made to keep the port cross section to 1 1/2" throughout its length.



Then move onto the internal bracing and port assembly. Loose lay the bracing and port pieces into the box and measure port cross section to top and where back will be once installed. You may need to adjust the lengths on the 45 degree pieces to keep the 1 1/2" port diameter over its length. Note I installed the back before working on the port assembly but I would leave it off until later next time....









I added some bracing in the port to address some of those unbraced 7/8" panels, I tried to add the equal amount of bracing to the port as the internal volume hoping the decreased volumes would offset each other with respect to tuning.













I added some VCT tile to the largest panels which could not be braced and some acoustic foam to try to help with standing waves. The last steps are to add Back, bottom and side to button it up and finish.











My finishing stinks(worse than my carpentry) and this one was rushed because Christmas snuck up on me and this was a gift for my brother.......

 

MFW15B.pdf 15.5771484375k . file
post #28 of 120
So.... does anyone know the exact internal volume or have dimensioned drawings?

post #29 of 120
Thread Starter 
Cut sheets added, now how about multiple sealed? Gotta off load a couple MFW originals and then Im thinking 4-8 sealed would motivate my space......
post #30 of 120
NicksHitachi,

can you tell me which prime and paint you used?

how many coats of each did you apply? sanding after each coat?

i am in the process of building 2 sealed mfw-15s. thanks
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