View Full Version : quarter wave t-line for pair of 8in

01-18-2014, 11:25 PM
box calculator to help with max dim.
http://i59.photobucket.com/albums/g286/j03m0n/tlinepairof8in_zpsc17f00d4.jpg (http://s59.photobucket.com/user/j03m0n/media/tlinepairof8in_zpsc17f00d4.jpg.html)

3-d model
http://i59.photobucket.com/albums/g286/j03m0n/t-linepair8infinal_zps9a3cc2db.jpg (http://s59.photobucket.com/user/j03m0n/media/t-linepair8infinal_zps9a3cc2db.jpg.html)

top view
http://i59.photobucket.com/albums/g286/j03m0n/t-linepair8intop_zpscdf0107b.jpg (http://s59.photobucket.com/user/j03m0n/media/t-linepair8intop_zpscdf0107b.jpg.html)

final look
http://i59.photobucket.com/albums/g286/j03m0n/t-linepair8inside_zps2942514b.jpg (http://s59.photobucket.com/user/j03m0n/media/t-linepair8inside_zps2942514b.jpg.html)

4x8ft sheet of mdf
http://i59.photobucket.com/albums/g286/j03m0n/20140118_093548_zpsf5aalb36.jpg (http://s59.photobucket.com/user/j03m0n/media/20140118_093548_zpsf5aalb36.jpg.html)

tools laid out
http://i59.photobucket.com/albums/g286/j03m0n/IMG_20140118_094611_zpsstq677h1.jpg (http://s59.photobucket.com/user/j03m0n/media/IMG_20140118_094611_zpsstq677h1.jpg.html)

lines made
http://i59.photobucket.com/albums/g286/j03m0n/IMG_20140118_111536_zpse4j3kfub.jpg (http://s59.photobucket.com/user/j03m0n/media/IMG_20140118_111536_zpse4j3kfub.jpg.html)

panels cut
http://i59.photobucket.com/albums/g286/j03m0n/IMG_20140118_115504_zpsjgonugse.jpg (http://s59.photobucket.com/user/j03m0n/media/IMG_20140118_115504_zpsjgonugse.jpg.html)

http://i59.photobucket.com/albums/g286/j03m0n/IMG_20140118_122101_zpswd9m8ydx.jpg (http://s59.photobucket.com/user/j03m0n/media/IMG_20140118_122101_zpswd9m8ydx.jpg.html)

pre-drilling holes
http://i59.photobucket.com/albums/g286/j03m0n/IMG_20140118_122112_zpsko4wtyhy.jpg (http://s59.photobucket.com/user/j03m0n/media/IMG_20140118_122112_zpsko4wtyhy.jpg.html)

01-18-2014, 11:26 PM
all glued and sealed off with port painted black
http://i59.photobucket.com/albums/g286/j03m0n/IMG_20140118_170626_zpsbufn3r7o.jpg (http://s59.photobucket.com/user/j03m0n/media/IMG_20140118_170626_zpsbufn3r7o.jpg.html)

testing location of led in port
http://i59.photobucket.com/albums/g286/j03m0n/IMG_20140118_170636_zpsq3s0yquu.jpg (http://s59.photobucket.com/user/j03m0n/media/IMG_20140118_170636_zpsq3s0yquu.jpg.html)

led glued down and led wires ran
http://i59.photobucket.com/albums/g286/j03m0n/IMG_20140118_170650_zpsznokrroa.jpg (http://s59.photobucket.com/user/j03m0n/media/IMG_20140118_170650_zpsznokrroa.jpg.html)

green led board i made screwed on and wires glued and ran in corner
http://i59.photobucket.com/albums/g286/j03m0n/IMG_20140118_170701_zpsi4vt3awu.jpg (http://s59.photobucket.com/user/j03m0n/media/IMG_20140118_170701_zpsi4vt3awu.jpg.html)

will try to get off work early tomorrow to finish the speaker holes, speaker wires run, 45s, glue top on.

01-18-2014, 11:31 PM
subs being used

massive audio "hippo" 8
http://i59.photobucket.com/albums/g286/j03m0n/hippo8_zps470e6c4c.jpg (http://s59.photobucket.com/user/j03m0n/media/hippo8_zps470e6c4c.jpg.html)

01-19-2014, 03:42 AM
rounded port walls?? looks good

01-19-2014, 04:31 PM
what did you line length end up being?

01-19-2014, 05:50 PM
Im trying to round the port off. Its not very good tho.

But the port line is 78in. Long
And 6in wide. 8.5in tall.
I got about 51sqin of port per foot.

01-19-2014, 06:17 PM
I got about 51sqin of port per foot.

Per foot?

01-19-2014, 08:09 PM
Sry port area 51sqin

01-19-2014, 08:16 PM
Throw some 45's in there

01-20-2014, 10:30 PM
cut out speaker holes and wired it up
http://i59.photobucket.com/albums/g286/j03m0n/IMG_20140120_162016_zpsr5rns3rq.jpg (http://s59.photobucket.com/user/j03m0n/media/IMG_20140120_162016_zpsr5rns3rq.jpg.html)

test fit in my car( **** it was a tight *** fit!!!)
http://i59.photobucket.com/albums/g286/j03m0n/IMG_20140120_173706_zpsuzo2ugtd.jpg (http://s59.photobucket.com/user/j03m0n/media/IMG_20140120_173706_zpsuzo2ugtd.jpg.html)

wanted the port to be faceing the rear but it was hitting the back of the car so i have it firing forward.
http://i59.photobucket.com/albums/g286/j03m0n/IMG_20140120_173723_zps8as1m4ww.jpg (http://s59.photobucket.com/user/j03m0n/media/IMG_20140120_173723_zps8as1m4ww.jpg.html)

now im going to break in the speakers till this weekend and drop the 45s in and glue and seal the top off

01-20-2014, 10:39 PM
did a quick pounding with the box and its tuned a bit higher than im used to but i have to remember that these are 8in sub and not 12s or 15s.

but in my opinion so far this is sounding pretty **** good and most important LOUD.
it pounds at the tune point (41hz) and gets pretty low (25hz) and sounds good at that low but i think because the port is firing forward the low note dont have time to travel b4 it gets to me, so i think the lows COULD sound alot better if i flip the box to fire the port back.

but i know the 45s in there should make a difference in the sound and sealing off the top.

so stay tuned more to come plus videos too.

01-20-2014, 10:40 PM
oh and this is the amp im using wired to 1ohm. (600wrms)
http://i59.photobucket.com/albums/g286/j03m0n/1bbb54720_zps73de3afb.jpg (http://s59.photobucket.com/user/j03m0n/media/1bbb54720_zps73de3afb.jpg.html)

01-20-2014, 11:14 PM
Very cool design man! Putting in wave guides will help but you won't get much more in the way of low end response out of it with the tuning that high. I've done a few lines for high Fs drivers that were tuned to Fs and they didn't do well on the lows. However, when tuning is below Fs even a high Fs sub will do well down low. Of course, you've probably figured out by now that not so good on the lows is still a lot better with a t-line than pretty good on the lows is with a conventional ported box, lol.

I'm looking forward to seeing some videos. :-)

01-20-2014, 11:54 PM
this is my first attempt at a t-line design and honestly not used to the higher tuned boxes but its kinda kool to be this loud of just two 8in subs on only 600 watts.

i used the dd-1 to set my deck, eq(line driver), and amp was at -10db test tone.

but yes vids will come out this weekend when im not waking and shaking my neighbors up lol. ill go to a park or something.

02-12-2014, 12:14 AM
From this morning b4 work
But its hard to see the car shake

02-12-2014, 12:27 AM
From this morning b4 work
But its hard to see the car shake

That's great man! I like it so much I stole your design... :-)


02-12-2014, 11:49 AM
What is yours tuned to

02-12-2014, 11:57 AM
What is yours tuned to

30Hz. That seems to be the best frequency I've found so far.

02-12-2014, 01:16 PM
Hows the low end response?

My tune seems a bit high for my taste.
But it is loud on 600watts.

02-15-2014, 01:14 AM
Better video

02-15-2014, 02:40 AM
Hows the low end response?

My tune seems a bit high for my taste.
But it is loud on 600watts.

Low end response is great. But I've experimented with small subs tuned at Fs and they don't do so well if not tuned lower and frankly, even large subs do better in t-lines when tuned lower than Fs. From what I've done, 30Hz seems to be the go to tuning for a t-line subwoofer.

But hey, your box looks like it's doing pretty good. :-)