or Connect
AVS › AVS Forum › Audio › DIY Speakers and Subs › My First Build: 3cf Sealed MFW-15
New Posts  All Forums:Forum Nav:

My First Build: 3cf Sealed MFW-15

post #1 of 256
Thread Starter 
well, after months of gathering info and getting tools together i was finally able to get the hands dirty.

first, i like to thanks everyone here for helping out an amateur. all the tools i got have been working out great!

i love build threads with lots of pics, it had been very educational for me so i'll try to take as much pics as i can during the build.

i am making 4 sealed MFW-15 subwoofers, 2 for myself and two for a brother. the internal dimension is 17"x17"x18.25" (3.05 cf). after bracing and drivers, i should be right around 3cf (or slightly under). i will have a double baffle, and the material is 3/4" 13 ply baltic (euro) birch.

i was able to get a sheet of 5x5 for $45 out of the door at a local distributor. and so far, the wood looks very nice.

i am sure i am leaving out some other details, so if you have questions/suggestions, let me know.
post #2 of 256
Thread Starter 
tonight, we cut two sheet of 5x5...enough for two boxes with some extras. need to buy a few more sheets.



post #3 of 256
Thread Starter 
also tested out a circle cut with the bosch router and jasper circle jig on a spare piece of mdf. what can i say, circle perfect? if you don't have a jasper, you need to get one.

post #4 of 256
Thread Starter 
oh....just in case you're wondering. this is my workstation. a $30 pair of sawhorse from home depot, and a sheet of 5x5 baltic on top. works great. i just don't have the budget for a $300 workbench.


post #5 of 256
Thread Starter 
hopefully, tomorrow we can cut the circles for all 4 boxes. and at least start gluing a box.

i just don't have enough clamps to glue them all at once. those darn clamps are expensive.
post #6 of 256
Why did you choose two single enclosures vs a dual opposed? Keep the pictures coming btw
post #7 of 256
Thread Starter 
i have a small room and also listen at very moderate level, so i didn't think i needed the dual opposed. two subs on the front corners should give me enough base and balance.

also, if 2 singles are not enough then i might just build two more singles and stacked them up.

this is coming from a 10" emotiva sub. so i should get plenty of bass.

oh, and i purchased an ep2500 to power them. also bought the fans from digikey to replace the oem fan.
post #8 of 256
I am very confident that you will be more than happy with your current build then. If you listen at very moderate volumes then you will have plenty of headroom to flatten your EQ as well!
post #9 of 256
Lookin good keep it up!
post #10 of 256
How are you going to EQ the lower end?
post #11 of 256
Thread Starter 
Quote:
Originally Posted by Erich H View Post

How are you going to EQ the lower end?

hmm....haven't really thought about that.

i thought a sealed box of of this size doesn't really need an EQ? would setting the crossover on my integra processor does this?
post #12 of 256
What does the model look like for it? If you are happy with the model for it unEQed then you do not need any EQing but most sealed designs require a LT circuit to increase the low end frequency output.
post #13 of 256
Thread Starter 
i didn't make a model, but i am sure someone else posted a sealed 3cf for this driver.

and what does an LT circuit do exactly? sorry, stupid question i know.
post #14 of 256
I think that wem2000 was boosting from 30 down..... to be flat that is....
post #15 of 256
Sealed at that size will need a low end boost. That was a mistake I made on my first build. I was disappointed and started a new project. Just for trials I later hooked up an EQ to the old boxes and it made them shine.
post #16 of 256
Thread Starter 
thanks Erich, which EQ would you suggest at take a look at?
post #17 of 256
Quote:
Originally Posted by smokarz View Post

oh....just in case you're wondering. this is my workstation. a $30 pair of sawhorse from home depot, and a sheet of 5x5 baltic on top. works great. i just don't have the budget for a $300 workbench.



That workbench looks familiar.
post #18 of 256
At least with an EP2500 and some type of EQ you'll be good to go for half a dozen more of these babies
post #19 of 256
Thread Starter 
would winisd works as EQ for these boxes?
post #20 of 256
You need an actual Equalizer like THIS ONE
For $100 it's a good deal.
There are others, Velodyne SMS-1, Behringer etc but they are much more expensive.
post #21 of 256
That EQ is almost the same price as a MiniDSP.

It is not that good a deal. For ~$30 more, the MiniDSP does FAR more than that EQ. Yeah - the MiniDSP is more work to set up, but it does so much more, and does it so much better. It also integrates with REW - you can calculate the needed EQ after measuring your room, then apply it nearly automatically.
post #22 of 256
Thread Starter 
Quote:
Originally Posted by smokarz View Post

would winisd works as EQ for these boxes?

sorry, i meant the MiniDSP.....

isn't that an EQ?
post #23 of 256
Quote:
Originally Posted by lilmike View Post

That EQ is almost the same price as a MiniDSP.

It is not that good a deal. For ~$30 more, the MiniDSP does FAR more than that EQ. Yeah - the MiniDSP is more work to set up, but it does so much more, and does it so much better. It also integrates with REW - you can calculate the needed EQ after measuring your room, then apply it nearly automatically.

For $100 it's still a good deal (consider the simplicity) but that makes the MiniDSP an even better deal even though it's alittle more expensive. I haven't done any homework on those but they look pretty cool after a quick browse. Maybe a kit is in order.
post #24 of 256
The EQ.2 from Elemental Designs has only two bands and a HPF. For $80 more someone can have all the EQing they ever want with TRUE LT circuit functions.

The Balanced MiniDSP is the right choice IMO. THere is not another choice out there for under $200 at all. I say the MiniDSP has more functionality then the DCX which is $299.
post #25 of 256
Thread Starter 
well, didn't get a chance to do any work last night.

hopefully, i can cut all the circles tonight for the double baffle and start gluing.

question: for the double baffle, is it good enough to just glue or should i glue AND nail/screw?
post #26 of 256
Thread Starter 
finally able to make some progress tonight.

after test mounting the driver on the mdf test cut, went ahead and cut all 8 baffles tonight.

darn that took a LONG time......



post #27 of 256
Thread Starter 
and then i went ahead and glue two double baffle together, before i ran out of clamps.....should have pick up another set of clamps.





post #28 of 256
Thread Starter 
ran into some challenges while gluing the baffles

1) since the cuts were made with a circular saw, precisions were not 100%. looks like i need to get a flush/trim router bit to even out the edges.

2) clamping the baffles were troublesome. the panels keep moving as i tried to clamp things down. had to put some screws on them. i had two brothers helping out, i don't think this is a one man job, extra hands were very helpful.

next time, we'll start gluing the boxes.

ps. while waiting for glue to heal, i went ahead and replace the stock fan on my ep2500 . now that was a quick/easy job. the new fan was so silent i thought i screwed things up until i put my hands against the fan to feel the draft.

we ended the night with a few cold beers while watching the eagles on blu-ray.
post #29 of 256
I used finishing nails to keep the 2 panels from moving when making the baffle. I must have at least 100 nails in each of my subs to help hold them together while the PL Premium dried.
post #30 of 256
Thread Starter 
finishing nails? why not screw?

i thought screws are better with woods? no?
New Posts  All Forums:Forum Nav:
  Return Home
  Back to Forum: DIY Speakers and Subs
AVS › AVS Forum › Audio › DIY Speakers and Subs › My First Build: 3cf Sealed MFW-15