My First Build: 3cf Sealed MFW-15 - AVS Forum
Forum Jump: 
Reply
 
Thread Tools
post #1 of 256 Old 05-09-2011, 08:15 PM - Thread Starter
AVS Special Member
 
smokarz's Avatar
 
Join Date: Feb 2007
Location: Hartford, CT USA
Posts: 3,261
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 12 Post(s)
Liked: 63
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.
smokarz is offline  
Sponsored Links
Advertisement
 
post #2 of 256 Old 05-09-2011, 08:17 PM - Thread Starter
AVS Special Member
 
smokarz's Avatar
 
Join Date: Feb 2007
Location: Hartford, CT USA
Posts: 3,261
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 12 Post(s)
Liked: 63
tonight, we cut two sheet of 5x5...enough for two boxes with some extras. need to buy a few more sheets.



smokarz is offline  
post #3 of 256 Old 05-09-2011, 08:19 PM - Thread Starter
AVS Special Member
 
smokarz's Avatar
 
Join Date: Feb 2007
Location: Hartford, CT USA
Posts: 3,261
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 12 Post(s)
Liked: 63
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.

smokarz is offline  
post #4 of 256 Old 05-09-2011, 08:21 PM - Thread Starter
AVS Special Member
 
smokarz's Avatar
 
Join Date: Feb 2007
Location: Hartford, CT USA
Posts: 3,261
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 12 Post(s)
Liked: 63
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.


smokarz is offline  
post #5 of 256 Old 05-09-2011, 08:25 PM - Thread Starter
AVS Special Member
 
smokarz's Avatar
 
Join Date: Feb 2007
Location: Hartford, CT USA
Posts: 3,261
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 12 Post(s)
Liked: 63
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.
smokarz is offline  
post #6 of 256 Old 05-09-2011, 08:26 PM
Advanced Member
 
diaz's Avatar
 
Join Date: Feb 2011
Posts: 614
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Liked: 15
Why did you choose two single enclosures vs a dual opposed? Keep the pictures coming btw
diaz is offline  
post #7 of 256 Old 05-09-2011, 08:33 PM - Thread Starter
AVS Special Member
 
smokarz's Avatar
 
Join Date: Feb 2007
Location: Hartford, CT USA
Posts: 3,261
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 12 Post(s)
Liked: 63
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.
smokarz is offline  
post #8 of 256 Old 05-10-2011, 04:41 AM
Advanced Member
 
diaz's Avatar
 
Join Date: Feb 2011
Posts: 614
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Liked: 15
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!
diaz is offline  
post #9 of 256 Old 05-10-2011, 05:48 AM
AVS Special Member
 
NicksHitachi's Avatar
 
Join Date: Jul 2007
Location: Wilmington, NC
Posts: 3,633
Mentioned: 4 Post(s)
Tagged: 0 Thread(s)
Quoted: 95 Post(s)
Liked: 143
Lookin good keep it up!
NicksHitachi is offline  
post #10 of 256 Old 05-10-2011, 06:19 AM
AVS Special Member
 
Erich H's Avatar
 
Join Date: Dec 2007
Location: Cincinnati OH
Posts: 5,347
Mentioned: 2 Post(s)
Tagged: 1 Thread(s)
Quoted: 281 Post(s)
Liked: 570
How are you going to EQ the lower end?


To view links or images in signatures your post count must be 0 or greater. You currently have 0 posts.


Twelve 10" NHT subwoofer build.
Cloning of a NHT VR-3.
2 ACI 15" subwoofers.

Erich H is offline  
post #11 of 256 Old 05-10-2011, 10:46 AM - Thread Starter
AVS Special Member
 
smokarz's Avatar
 
Join Date: Feb 2007
Location: Hartford, CT USA
Posts: 3,261
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 12 Post(s)
Liked: 63
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?
smokarz is offline  
post #12 of 256 Old 05-10-2011, 10:51 AM
AVS Addicted Member
 
penngray's Avatar
 
Join Date: Feb 2006
Location: Florida
Posts: 26,779
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Liked: 30
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.

It is not "open-minded" to reject knowledge - Bob Lee
penngray is offline  
post #13 of 256 Old 05-10-2011, 10:54 AM - Thread Starter
AVS Special Member
 
smokarz's Avatar
 
Join Date: Feb 2007
Location: Hartford, CT USA
Posts: 3,261
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 12 Post(s)
Liked: 63
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.
smokarz is offline  
post #14 of 256 Old 05-10-2011, 11:00 AM
AVS Special Member
 
NicksHitachi's Avatar
 
Join Date: Jul 2007
Location: Wilmington, NC
Posts: 3,633
Mentioned: 4 Post(s)
Tagged: 0 Thread(s)
Quoted: 95 Post(s)
Liked: 143
I think that wem2000 was boosting from 30 down..... to be flat that is....
NicksHitachi is offline  
post #15 of 256 Old 05-10-2011, 11:23 AM
AVS Special Member
 
Erich H's Avatar
 
Join Date: Dec 2007
Location: Cincinnati OH
Posts: 5,347
Mentioned: 2 Post(s)
Tagged: 1 Thread(s)
Quoted: 281 Post(s)
Liked: 570
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.


To view links or images in signatures your post count must be 0 or greater. You currently have 0 posts.


Twelve 10" NHT subwoofer build.
Cloning of a NHT VR-3.
2 ACI 15" subwoofers.

Erich H is offline  
post #16 of 256 Old 05-10-2011, 11:44 AM - Thread Starter
AVS Special Member
 
smokarz's Avatar
 
Join Date: Feb 2007
Location: Hartford, CT USA
Posts: 3,261
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 12 Post(s)
Liked: 63
thanks Erich, which EQ would you suggest at take a look at?
smokarz is offline  
post #17 of 256 Old 05-10-2011, 04:42 PM
AVS Special Member
 
pgwalsh's Avatar
 
Join Date: Feb 2008
Location: Colorado Springs
Posts: 1,408
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 58 Post(s)
Liked: 57
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.

Builds: 
To view links or images in signatures your post count must be 0 or greater. You currently have 0 posts.
, Dual Opposed MFW's x 2, Statements, 
To view links or images in signatures your post count must be 0 or greater. You currently have 0 posts.
 x 5. 
pgwalsh is offline  
post #18 of 256 Old 05-10-2011, 04:48 PM
AVS Special Member
 
Danielson99's Avatar
 
Join Date: Dec 2008
Location: British Columbia, Canada
Posts: 1,890
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 6 Post(s)
Liked: 21
At least with an EP2500 and some type of EQ you'll be good to go for half a dozen more of these babies
Danielson99 is offline  
post #19 of 256 Old 05-10-2011, 04:58 PM - Thread Starter
AVS Special Member
 
smokarz's Avatar
 
Join Date: Feb 2007
Location: Hartford, CT USA
Posts: 3,261
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 12 Post(s)
Liked: 63
would winisd works as EQ for these boxes?
smokarz is offline  
post #20 of 256 Old 05-10-2011, 05:08 PM
AVS Special Member
 
Danielson99's Avatar
 
Join Date: Dec 2008
Location: British Columbia, Canada
Posts: 1,890
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 6 Post(s)
Liked: 21
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.
Danielson99 is offline  
post #21 of 256 Old 05-10-2011, 05:13 PM
AVS Special Member
 
lilmike's Avatar
 
Join Date: Dec 2009
Location: Pacific Northwest
Posts: 2,193
Mentioned: 0 Post(s)
Tagged: 1 Thread(s)
Quoted: 18 Post(s)
Liked: 86
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.

Hornresp Tutorials (By amateurs, for amateurs!)


To view links or images in signatures your post count must be 0 or greater. You currently have 0 posts.



To view links or images in signatures your post count must be 0 or greater. You currently have 0 posts.
lilmike is offline  
post #22 of 256 Old 05-10-2011, 05:14 PM - Thread Starter
AVS Special Member
 
smokarz's Avatar
 
Join Date: Feb 2007
Location: Hartford, CT USA
Posts: 3,261
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 12 Post(s)
Liked: 63
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?
smokarz is offline  
post #23 of 256 Old 05-10-2011, 05:26 PM
AVS Special Member
 
Danielson99's Avatar
 
Join Date: Dec 2008
Location: British Columbia, Canada
Posts: 1,890
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 6 Post(s)
Liked: 21
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.
Danielson99 is offline  
post #24 of 256 Old 05-10-2011, 07:07 PM
AVS Addicted Member
 
penngray's Avatar
 
Join Date: Feb 2006
Location: Florida
Posts: 26,779
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Liked: 30
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.

It is not "open-minded" to reject knowledge - Bob Lee
penngray is offline  
post #25 of 256 Old 05-11-2011, 09:42 AM - Thread Starter
AVS Special Member
 
smokarz's Avatar
 
Join Date: Feb 2007
Location: Hartford, CT USA
Posts: 3,261
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 12 Post(s)
Liked: 63
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?
smokarz is offline  
post #26 of 256 Old 05-13-2011, 09:02 PM - Thread Starter
AVS Special Member
 
smokarz's Avatar
 
Join Date: Feb 2007
Location: Hartford, CT USA
Posts: 3,261
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 12 Post(s)
Liked: 63
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......



smokarz is offline  
post #27 of 256 Old 05-13-2011, 09:04 PM - Thread Starter
AVS Special Member
 
smokarz's Avatar
 
Join Date: Feb 2007
Location: Hartford, CT USA
Posts: 3,261
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 12 Post(s)
Liked: 63
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.





smokarz is offline  
post #28 of 256 Old 05-13-2011, 09:11 PM - Thread Starter
AVS Special Member
 
smokarz's Avatar
 
Join Date: Feb 2007
Location: Hartford, CT USA
Posts: 3,261
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 12 Post(s)
Liked: 63
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.
smokarz is offline  
post #29 of 256 Old 05-13-2011, 09:17 PM
AVS Special Member
 
UNICRON-WMD's Avatar
 
Join Date: Jan 2005
Location: Milwaukee, WI
Posts: 1,822
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Liked: 12
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.

God loves me, but everyone else thinks I'm an a$$hole.

To view links or images in signatures your post count must be 0 or greater. You currently have 0 posts.
UNICRON-WMD is offline  
post #30 of 256 Old 05-13-2011, 09:30 PM - Thread Starter
AVS Special Member
 
smokarz's Avatar
 
Join Date: Feb 2007
Location: Hartford, CT USA
Posts: 3,261
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 12 Post(s)
Liked: 63
finishing nails? why not screw?

i thought screws are better with woods? no?
smokarz is offline  
Reply DIY Speakers and Subs

User Tag List

Thread Tools
Show Printable Version Show Printable Version
Email this Page Email this Page


Forum Jump: 

Posting Rules  
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off