Transmission Line

[aznboi3644 2]

Whats up guys...Heres a box I finished up yesterday. It is a transmission line tuned around 31Hz. Right now there is an EHQS 12 (SVC 4 ohm) in there. Amp is a JBL CS200.1. Rated at ~200 watts at 4 ohms.

As for how it sounds...FUKIN AWESOME. The tonality is a lot different from the 2.5 cu ft @ 30Hz box it the EHQS was in and output is a lot higher. This thing digs deep and has usable response down to 25Hz testing with sine waves...below that it unloads and doesn't have much output. It has a pretty flat response from 28 - 60Hz. I really love how it sounds. It's easy to tell when the EHQS is reaching its mechanical limits as I can hear it bottoming out but that is only on certain beats but overall it slams hard and gets really low but still retains its punchiness and transients.

30-35Hz tones are fun. Compared to the 2.5 cu ft ported...this T-Line rapes it hands down. Only thing is that the box is 38.5" wide and 21.75" deep lol. But I don't need cargo space.

I think everyone should get to listen to a transmission line enclosure...it does really have a different sound to it.

I took a small vid today. my sister's camera has barely any memory on it so 29 seconds is all I got.

Anyways...heres a little vid and some build pics.

[Adrian_D 520]

How easy is it to reach the mechanical limits compared to the old box ?

I say you need a bit more bracing or at least a double baffle

[aznboi3644 2]

The box does fine...I don't feel any flexing or major vibrations. The sub handles 200 watts much better in this box somehow. I can still bottom out the sub if I want to though.

[cshaw 0]

yeah t-lines will be way more efficient than the normal sealed or porte boxes power wise. looks god man! i cant wait to build one of these for a local around here to see how they sound. although im going to put 45 peices in the corners.

[Alaxan 0]

Looks good, but in the future... the angles of the transmission line in the box work much better when they aren't 90degree angles... Part of the tuning of any transmission line involes very much so the angles internally.

[cshaw 0]

yeah they are suppose to taper near the end of the port to reduce standing waves. but sub frequencies are not short enough to create them. at least this is my info on tl- boxes for full range speakers, dont know if it applies to this or not

[aznboi3644 2]

well actually a transmission line does NOT "have" to taper. It can have a negative taper, positive taper, or a 1:1 ratio.

today I took one of my friends 12 Type R's and put it in my T-line.

He has the Best Buy 4 year replacement plan so he wanted to blow his two and get new ones...I said I could help with that

Well I just got back from a HEAVY BEATING SESSION. I mean I threw the full fury of the Elemental Designs Nine.1 at it at 1 ohm and it only gave out some burnt coil smell but still pounds.

I mean first I gave it the usual full blast of "White Girl" and "Hypnotize"...the WHOLE SONG.

Still nothing...so I said aight well lets see if we can bottom it out. Played a 10Hz tone for a FULL MINUTE. No sweat the sub just laughed at us.

Played 20Hz tone for a FULL MINUTE. Ehhh some vc smell but nothing major. Hey how about another minute of some 30Hz tone. Still nothing. The smell came and went. Maybe it was some excess glue.

BUT GOD DAMN...this Type R will NOT DIE. My ears are KILLING. I even played a bunch of Bass songs...the usual stuff you download from limewire when putting in "bass tester" and stuff like that.

I mean 30 minutes of full blast 1200 watts and tones...the sub is still alive and kicking.

WTF?? lol

I'll take some vids sunday..I'll be gone for the weekend for a wedding.

The vids should be good...it was painful