Transmission line subwoofer box
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- čas přidán 4. 05. 2020
- Here is my attempt at building a transmission line subwoofer box, without using any modeling software.
Speaker used (Amazon affiliate link) : www.amazon.com/gp/product/B01...
Learn DIY Audio stuff :
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Videos linked at the end :
• Sealed vs Ported vs Hi...
• Isobaric subwoofer box...
Music Credits:
"Werq" Kevin MacLeod (incompetech.com)
Licensed under Creative Commons: By Attribution 4.0 License
creativecommons.org/licenses/b... - Jak na to + styl
I've built sealed and vented my whole life. I had a small sports car with a tiny 8" sealed wedge in the back but got rid of that car and had a high excursion 8" lying around, so for kicks I tried a flared T-Line (hybrid of a horn and T-Line) and I was blown away by the low end extension from such a tiny sub. It went into my SUV and rattled the car with only 250w rms into it. I'm a T-Line fan for life. Trying another T-Line again this time with my Solobaric L7 12" currently sitting in a vented box.
I'm really glad someone recommended I check out your channel, awesome work man.
Hornresp really isn't bad once you get the hang of it, and can simulate damping material in different parts of the line as well.
It looks like the line area was quite a bit larger than the Sd of the sub, that's probably why it was so peaky at tuning. The proper line area for a flat response depends on how peaky the speaker is as well, and a line less than Sd/damping may need to be used.
aaaand the criminally undersubbed award of the year goes to...
I recently heard a Sundown Audio 10 in a t-line box and it was some of the best bass that I have ever heard in a car. Flat frequency response. Played, low, mid and high bass pretty equally.
A properly set TL will not only produce A LOT of bass for a given woofer but also GREAT QUALITY bass. Once heard you can't go back.
This is a cool video. I really wish you had experimented with damping to see how far you could take the design, it would have been super interesting!
I like the exploratory approach to the video. Your conclusion is correct in the end that you need to model it in hornresp. Hornresp is incredibly easy to use in modeling a TL. I used to build TLs for car audio back in the mid 00s with the purpose of getting loud, with an expanding area and they got very loud, but had peaks and dips. I would just build the line at 1/4 the wavelength - generally 30-35hz with no modeling and no consideration for where the driver was located along the line. Once I learned how to use Hornresp, my biggest conclusion is that the driver generally needs to be located about 1/3 from the start of the line to get rid of the nasty peaks and dips until well above the range you're attempting to play. I also think it's important to understand to model TL vs ported, because in many cases ported will do just as well, if not better.
Nice video and assessment. I have heard some great TL subs, but I agree the ones that I've seen that worked well had either narrowing chamber volume and/or a good amount of damping. I would think that they should all utilize a serious crossover to ensure that they are just generating sub LF (below 80Hz) from the combined response of the woofer and the box.
Great work keep uploading 🤟🏻🤘🏻👍🏻👍🏻
Hi, nice video! Some design are made with narrowing transmission line, with some chamber volume before it. The beginning of the line is with surface around 2 times surface of the driver (Sd). The end is around 1/2 Sd. The line is heavily damped. It helps to reduce peaks and deeps. It is some like reversed horn :)
Great video
went tru all that trouble to build test and show, but didnt demo it for us to hear for ourselves.... we have to SEEE how it sounds.
Try/review SPICY TL software. Much better and easy to use. Also very accurate simulation vs actual results.
good day friend, sorry if I put 2 woffer in 1 only drawer tline increases the area of the port?
HEY I COULD USE SOME HELP CAL'ING THE PORT SIZE AN LENGHT FOR A 10PLB76 WOOFER TLINE BUILD IVE GOT TWO BOARDS THAT ARE 1.5IN BY 11.25IN WIDE BY 8FT LONG THAT I INTEND TO USE FOR THE FRONT BACK AN INTURNAL WALL AN ONE .75IN BY 4FT BY 8FT MDF TO USE TO MAKE THE SIDES SO THAT IN MIND COULD YOU HELP ME WITH THE DESIGN FYI I DONT MIND A TALL BOX JUST NOT A SUPER DEEP BOX PREFURABLE NOT MORE THEN 14INs I ALSO PLAN TO FEED IT 200WATTS SO FACTOR THAT IN IF YOU WOULD THANKS
All what I understand is that its complicated, but ain't there any advantages over a bass reflex??
And is the Only difference to bass reflex just the port length?
Transmission line has nothing to do with bass reflex. Transmission line is a wave guide, You can slap a pipe at the back of the speaker and that will be a transmission line. Bass reflex works on the resonating principle and the air inside the port resonates. Transmission line just delays the back wave long enough until is no longer out of phase with the front wave. Theoretically, transmission lines are much more awesome, but are really difficult to pull off and occupy a lot of space.
@@AudioJudgement Ok, so all designs feature a second resonating mass, either you call it passive radiator, transmission line or vent.
@@DavidKaden369 No, transmission line has no resonating mass. It simply delays the back wave. The back wave is out of phase with the front wave. If they meet they cancel each other. By making the back wave travel a long line, the phase shifts. When the back wave exits the line and meets the front wave, they will not be out of phase anymore and they will add up.
@@AudioJudgement Also the mass of air in the line couples with the driver, so there is only 1 resonating mass in the system.
Acum cativa ani am construit un subwoofer TL. (www.diyaudio.com/forums/subwoofers/208498-line-subwoofer-dayton-sd270a-88-a.html)
Rezultatul mi-a depasit asteptarile, cobarand lejer pana la 20 HZ, dar dupa un timp l-am modificat si l-am transformat in basreflex din considerente de spatiu si volum.
Incinta TL spre deosebire de BR poate fi acordata mai jos decat FS al difuzorului acesta fiind principalul avantaj.
You can tune a bass reflex or “ported box” lower than the FS of the driver with no issues, had a Skar EVL 15 it’s FS was 35hz and I was tuned at 25hz and it worked great for what I needed it for. Now I’m about to play around with TL enclosures to see what happens.
You didn't touch on how you got your area for the T-line. The subs Sd is what you should use and I can tell by the area you're way over that.
Yup, it’s a square which is a bit larger than speaker Sd. The main concern is that the area is not smaller than Sd, not necessarily equal. Some lines are tapered for example.
Yes, you don't want to go under Sd, but according to the Loudspeaker Design Cookbook, you don't want to go any bigger then 10%. And you're still past that 10%.
Luckily though you have the tools to measure and correct for it.
I don't get why everybody is trying to make open transmission lines work. The back wave is your enemy. You need to tame it or get rid of it completely.
UUMMMMMM a sub woofer is not a sub woofer with out a Low pass ..why waist the Amp's energy trying to produce frequencies your woofer ,BOXED or not ,cant even produce
BS. I haven't built a bad one yet using a sub with a QTS .4 or lower. That design and build is horrible man. It doesn't do it justice