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post #1 of 10 Old 03-06-2017, 02:31 PM - Thread Starter
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Forum Introduction and my 12" DIY Sub Enclosure

Hey guys, I'm new here and this is my first thread & post on AVS Forum. I've lurked for quite a while, but finally decided to join and share my DIY project, but also seek guidance in planning my next DIY Subwoofer enclosure.

From my younger days, I had a 12" JL Audio W6v2. It had been collecting dust so I decided to put it to use. I do not have a HT setup, but do enjoy listening to music, and thoroughly appreciate having TONS of bass, or at least the ability to rattle my house with bass, if I'm in the mood.

From my internet research prior to designing and building the enclosure, it's a transmission line slot-ported enclosure. From what I've read on here, the port is similar to a homewrecker design in that there's almost 8' of porting inside the enclosure. The entire enclosure is 3/4" MDF. I'm pretty good with wood-working, so this wasn't a difficult build. The front baffle is 1.5". I used wood glue in addition to screws to assemble. I used silicon caulking to seal the inside edges. I opted to install a Dayton Audio 250w subwoofer plate amp. I didn't want a separate stand-alone amp for the sub.

I attached a few pictures. The side view shows the transmission line port.


Thanks for looking.
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post #2 of 10 Old 03-06-2017, 03:05 PM
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nice looking box. i like it.

THANK YOU!!! for your selfless contribution to the audio world
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post #3 of 10 Old 03-06-2017, 04:28 PM - Thread Starter
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Originally Posted by 1201 View Post
nice looking box. i like it.
Thanks. I don't regret anything, but there are certainly a few things I would do differently next time.

For instance:

- Additional bracing inside the enclosure
- Fill and sand the screw holes
- Paint with a duracoat finish
- Not build a separate compartment for the plate amp
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post #4 of 10 Old 03-06-2017, 10:52 PM
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Quote:
Originally Posted by Craig S King View Post
Hey guys, I'm new here and this is my first thread & post on AVS Forum. I've lurked for quite a while, but finally decided to join and share my DIY project, but also seek guidance in planning my next DIY Subwoofer enclosure.

From my younger days, I had a 12" JL Audio W6v2. It had been collecting dust so I decided to put it to use. I do not have a HT setup, but do enjoy listening to music, and thoroughly appreciate having TONS of bass, or at least the ability to rattle my house with bass, if I'm in the mood.

From my internet research prior to designing and building the enclosure, it's a transmission line slot-ported enclosure. From what I've read on here, the port is similar to a homewrecker design in that there's almost 8' of porting inside the enclosure. The entire enclosure is 3/4" MDF. I'm pretty good with wood-working, so this wasn't a difficult build. The front baffle is 1.5". I used wood glue in addition to screws to assemble. I used silicon caulking to seal the inside edges. I opted to install a Dayton Audio 250w subwoofer plate amp. I didn't want a separate stand-alone amp for the sub.

I attached a few pictures. The side view shows the transmission line port.


Thanks for looking.

That's a great project! How do well does it perform in the box?

As it so happens I have a pair of old JL Audio 12W6's laying around. I have a bandpass box that I was going to place them in for my SUV in my younger days.

I'd love to have a copy of your design plans as I'd like to repurpose these drivers as either nearfield subs or rear subs in my HT.
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post #5 of 10 Old 03-09-2017, 03:57 AM - Thread Starter
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Originally Posted by video1 View Post
That's a great project! How do well does it perform in the box?

As it so happens I have a pair of old JL Audio 12W6's laying around. I have a bandpass box that I was going to place them in for my SUV in my younger days.

I'd love to have a copy of your design plans as I'd like to repurpose these drivers as either nearfield subs or rear subs in my HT.
Thank you. As far as performance, I've been very happy with it - especially since it's a re-purposed car audio subwoofer I bought probably the better part of 15 years ago. It's seen a lot of power thrown at it over the years, and now resides in my computer room, helping supplement the lows to my music.

I don't think I have the original designs from the build, but I can measure it again and send the dimensions your way.
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post #6 of 10 Old 03-09-2017, 11:18 AM
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Nice project! Is 250w enough to get that woofer really moving? I figured the JLs were stiff old beasts, but I've never actually handled one.

Did you chamfer the corners on the enclosure? Most people round over, but I'm pretty dead set on a nice flat chamfer when I build my subs. Happy you went that route?
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post #7 of 10 Old 03-09-2017, 02:53 PM - Thread Starter
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Bartley, surprisingly the 250w does get the W6 moving pretty good. As best as I can observe, I'm seeing the better part of 1" excursion total. However, I think the W6 could handle a lot more power. If I recall, the W6 is easily a 500w sub, so I'm barely throwing half at it. But for my purposes, it hammers out the lows that I listen to.

And yes, I did a 45-degree chamfer on all of the edges. Good eye! No particular reason, but I do appreciate a nice chamfered edge as well. I'm sure I will do the same on my next enclosure I'm planning currently.
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post #8 of 10 Old 03-09-2017, 04:32 PM
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Welcome! (I'm relatively new here too)
Nice enclosure..
I like the fact that it's a t-line of sorts too, as I've built many-a-t-lines over the years and like their effortless, smooth, and deep sound...
Did you treat the line itself with stuffing/lining?
Also, how long is the line in total feet?

Actually, I love tube amps..
I play guitars through them.
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post #9 of 10 Old 03-10-2017, 03:51 AM - Thread Starter
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Wreckingball, thanks. As for lining the t-line, no, I did not. I didn't think about that. I stuffed the airspace inside the enclosure, but not the t-line.

As for the actual length, I'll measure it again when I get the measurements for video1. Although I believe it's close to 8'.
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post #10 of 10 Old 03-19-2017, 09:41 AM - Thread Starter
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Sorry it took over a week to get the measurements posted.

Overall cabinet: 31"x23"x14.5" this includes the section that houses the plate amp.

Sub cabinet only: 25"x23"x14.5"

T-line channel: 4" wide x 64" long

Weight: Too damn heavy
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