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View Full Version : Transmission Line Enclosure for Boomintahoe



DNick454
08-12-2009, 11:11 PM
This is a design that I've been working on for boomintahoe. Figured I'd post some pictures and get your opinons. It still needs a little work to integrate the plate amp into it. I'll have to make a separate chamber on the back for it.

Anyways, this enclosure is for a single 8" Dayton subwoofer. It will be used in a home theater setup. This enclosure is a transmission-line style enclosure and has a line length of 11.5' (yes, that's feet, not inches) and is tuned to 25Hz :crazy:

Laying down some guidelines... this gets tedius:crap:

http://i94.photobucket.com/albums/l87/DNick454/8tline25Hz115feet.jpg

Port line walls mapped out... all 11.5 feet of it:crazy: Pain in the *** measuring out all of those ****ed 45 degree braces...

http://i94.photobucket.com/albums/l87/DNick454/8tline25Hz115feet2.jpg

Walls put up

http://i94.photobucket.com/albums/l87/DNick454/8tline25Hz115feet4.jpg
http://i94.photobucket.com/albums/l87/DNick454/8tline25Hz115feet3.jpg

Hole for sub.
http://i94.photobucket.com/albums/l87/DNick454/8tline25Hz115feet5.jpg






Just realized though that the dayton 8" driver has a big *** magnet assembly and has a 4.5" mounting depth. Looks like I'll have to figure out something with the baffle or the sub will have to be ran inverted because the port is only 2" wide.

Pioneer~Saturn
08-12-2009, 11:13 PM
Nice :)

DNick454
08-12-2009, 11:14 PM
Alright, so I came up with the idea to just use an extra ring, kinda like you would in a door speaker to gain some depth. I made it that shape just it wouldn't look gay as just a ring. I think it looks somewhat interesting :)

http://i94.photobucket.com/albums/l87/DNick454/8tline25Hz115feet6.jpg


A little added graphics to give it that fit'n'finished look. ;)

http://i94.photobucket.com/albums/l87/DNick454/8tline25Hz115feet7.jpg

http://i94.photobucket.com/albums/l87/DNick454/8tline25Hz115feet8.jpg




Still needs a bit of work to incorporate the plate amp. It's not a done deal yet, but let me know what you guys think.

Pioneer~Saturn
08-12-2009, 11:15 PM
I was thinking about something almost identical to that to space it, lol

req
08-12-2009, 11:16 PM
that is a whole hell of a lot of work for a little dayton 8" sub. jeez.

DNick454
08-12-2009, 11:19 PM
that is a whole hell of a lot of work for a little dayton 8" sub. jeez.

Yeah, don't get me started on drawing each individual 45 brace and rounding each port end piece. It got tedious but it should sound great in a H/T setup and have a good response off very little power.

boomintahoe
08-12-2009, 11:24 PM
Wow. That's gonna be an interesting build. Good thing I'm almost done cleaning out my garage to free up space for projects like this! Oh so I can park my SUV in it too.

DNick454
08-12-2009, 11:28 PM
Yeah, nice thing is though, all the port pieces are the same length and are identical. All you've gotta do is set the length on your fence and table saw and just make multiple passes. The same ease can't be said for rounding over everything and actually constructing it... but oh well, it'll sound nice :D

boomintahoe
08-12-2009, 11:38 PM
After you redo the area for the plate amp, I did some calculations for the mounting depth of the sub and that little baffle is nice but still needs a little more...the back of the magnet will still hit the "port wall". Anyway, I'll let ya reconfigure...lookin' good tho. :)

DNick454
08-13-2009, 01:33 AM
Hmm, might just need to make that baffle a tad thicker then. Or add another trim ring ontop of it. I'll think of something that looks somewhat nice :D

tyler_fitz
08-13-2009, 01:35 AM
lol
what, you're not gonna kerf it and make it all rounded and cool lookin?

DNick454
08-13-2009, 01:37 AM
Neva!

ciaonzo
08-13-2009, 01:39 AM
Keep in mind that the windows are not very large on that driver and airflow will be restricted due to the thick baffle if provisions aren't made.

tyler_fitz
08-13-2009, 01:40 AM
i think if you made the box shorter, the port would have to be wider, which would give you some more clearance for the sub to be mounted without the lil spacer thing.

DNick454
08-13-2009, 01:44 AM
i think if you made the box shorter, the port would have to be wider, which would give you some more clearance for the sub to be mounted without the lil spacer thing.


True, but then the box would be really wide and/or deep. I'll let boomin comment though, it's going in his H/T setup, not mind :crazy:

boomintahoe
08-13-2009, 04:27 PM
Keep in mind that the windows are not very large on that driver and airflow will be restricted due to the thick baffle if provisions aren't made.

Windows?? On a sub?? I think you need to put down the crack pipe down buddy.

boomintahoe
08-13-2009, 04:47 PM
True, but then the box would be really wide and/or deep. I'll let boomin comment though, it's going in his H/T setup, not mind :crazy:

Do whatever it takes...

ciaonzo
08-13-2009, 06:20 PM
Windows?? On a sub?? I think you need to put down the crack pipe down buddy.

The openings that allow the rear wave to pass are often referred to as windows. If I were to build a baffle that was 1.5" thick for this style of basket I would be restricting the airflow if I didn't make necessary provisions . Maybe if you ******* prats weren't so concerned with launching little verbal assaults on people who offer helpful advise, you could learn something.


http://i704.photobucket.com/albums/ww43/ciaonzo/Misc%20TC/DSC02879.jpg

boomintahoe
08-13-2009, 10:02 PM
The openings that allow the rear wave to pass are often referred to as windows. If I were to build a baffle that was 1.5" thick for this style of basket I would be restricting the airflow if I didn't make necessary provisions . Maybe if you ******* prats weren't so concerned with launching little verbal assaults on people who offer helpful advise, you could learn something.


http://i704.photobucket.com/albums/ww43/ciaonzo/Misc%20TC/DSC02879.jpg

Never heard them called windows. Basket would be the more correct term. In all the yrs I've been into car audio, I've never heard that term referred to as "windows"...unless your talkin about computers/microsoft. I think Nick has things covered. Now, take your attitude and gtfo.

ciaonzo
08-13-2009, 10:25 PM
Never heard them called windows. Basket would be the more correct term. In all the yrs I've been into car audio, I've never heard that term referred to as "windows"...unless your talkin about computers/microsoft. I think Nick has things covered. Now, take your attitude and gtfo.

:laugh: I guess if boomintahoe's never heard of something, it doesn't exist.

This is a tidbit from a Seas driver spec page;

An extremely stiff and stable injection moulded metal basket to keep the critical components in
perfect alignment. Large windows in the basket both above and below the spider to reduce sound reflexion, air flow noise and cavity resonance to a minimum.

You see, the windows are integral to the basket design. The are essentially part of the basket even though they are the part where material doesn't exist. It's just a descriptive term. Learn it.

Let's also be clear as to who came at who with that attitude you stupid ****. I made a simple suggestion without condescending to anyone or criticizing the design. You come back with the crack pipe bit. Stick that sharp tongue of yours right in my dirty, hairy sphincter.


*Awaits the inevitable ****** retort.*

Volenti
08-14-2009, 01:01 PM
Having that many 180 turns in the design is going to introduce resistive losses that could negatively effect the end result.

A taller/longer design with only one or two 180 turns would perform more accuratly to the design and would allow the driver to fit more easily.

boomintahoe
08-19-2009, 08:42 PM
*Bump* Nick, what's taking so long????