Hi everyone I am planning on experimenting with transmission line subwoofer and was wondering if t line subwoofer is really worth the extra box size.
As far as I know t line has flatter response and slower rolloff so it would get deeper than ported.
We are talking about a box for cheap generic 12 inch subwoofer. I have some parameters for these drivers and i can provide them if needed.
I am on a budget currently and i already have these drivers and want to experiment with them until I can upgrade.
As far as I know t line has flatter response and slower rolloff so it would get deeper than ported.
We are talking about a box for cheap generic 12 inch subwoofer. I have some parameters for these drivers and i can provide them if needed.
I am on a budget currently and i already have these drivers and want to experiment with them until I can upgrade.
TL for sub
In my opinion it's a less compromised option. It sounds more accurate to my ear and is more efficient by about 3db generally. Meaning it takes 1/2 the power for equal output of say a ported box.
In my opinion it's a less compromised option. It sounds more accurate to my ear and is more efficient by about 3db generally. Meaning it takes 1/2 the power for equal output of say a ported box.
Greets!
Can be, so please provide all info available to see what type of TL may be suitable and any HxWxD size limits.
GM
Can be, so please provide all info available to see what type
GM
Whether a driver will work in a TL depends on the driver and how well you are at ddesigning a TL.
dave
dave
Hofmann's law applies. There is a balance between small enclosure size, low frequency extension and efficiency.
Vented and transmission line are similar. Both use a single resonator at the low end of the pass band and have a fourth order high pass characteristic. Both can have a flat frequency response. Transmission line offers more degrees of freedom for tuning, to allow for a slow roll-off for example. Cheap woofers usually have a weak motor and do not work well in either enclosure type.
Vented and transmission line are similar. Both use a single resonator at the low end of the pass band and have a fourth order high pass characteristic. Both can have a flat frequency response. Transmission line offers more degrees of freedom for tuning, to allow for a slow roll-off for example. Cheap woofers usually have a weak motor and do not work well in either enclosure type.
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Thanks for all the feedback.
This is my first ever transmission line experiment so I don't have any experience.
I know i am supposed to make line length 1/4 of wavelength of the tuning freqency and i know i can use hornresp to simulate it.
Here are the parameters. I don't know how accurate thay are because it was cheap.
Qes 0.652
Qts 0.567
F0 (hz) 34.055
SD (cm2) 518.75
Vas (L) 52.378
Bi 19.399
Cms (uM/N) 137.07
Qms 4.356
Mms (g) 159.344
Qes 0.652
Mmd (g) 152.55
As far as box size goes. It is for my room and i am ready for it to be huge
This is my first ever transmission line experiment so I don't have any experience.
I know i am supposed to make line length 1/4 of wavelength of the tuning freqency and i know i can use hornresp to simulate it.
Here are the parameters. I don't know how accurate thay are because it was cheap.
Qes 0.652
Qts 0.567
F0 (hz) 34.055
SD (cm2) 518.75
Vas (L) 52.378
Bi 19.399
Cms (uM/N) 137.07
Qms 4.356
Mms (g) 159.344
Qes 0.652
Mmd (g) 152.55
As far as box size goes. It is for my room and i am ready for it to be huge
Fire up Hornresp and give it a go. 🙂 If you are unsure of the Thiele-Small parameters, it is best to measure them first. This can be done with Artalabs LIMP ARTA Software.
After building a set of tritrix, I'm convinced about the validity of the TL enclosure. I noticed (heard) the benefits before I read about them. I can't wait to build the next set using the Triune scheme in the same enclosure. Apparently they dig even deeper. I say go for it.
Only if the line is untapered.
If it narrows towards the terminus it will be shorter, if the other way, it is longer.
dave
You're welcome!
Brand, model? For my records.
TLs are normally big enough to allow plenty of tuning in room with damping material, so specs can be off quite a bit in some cases, though with such a low Vas for a 12" a Fs/Qts tuning is in theory best overall, which of course is > Fs.
Regardless, simming traditional and vented variants [ML] TL, TQWT to compare is good practice for a novice.
GM
I was going to start a topic about this, but my questions are so much in line of this topic, I might as well ask them here.
I plan on diving into transmission line subwoofers, specifically tapped horns.
I would really like to dig into the theory behind transmission lines before I start simming. Does anyone have links or recommendations to literature about the subject? I am no stranger to complex math.
The driver I wish to use is a Tang Band W5-1138SMF.
Would a transmission line speaker with such a small subwoofer driver even make any sense?
I'm not looking for high SPL, but I am interested in how low I can get this little subwoofer driver to go in a properly desinged box.
I plan on diving into transmission line subwoofers, specifically tapped horns.
I would really like to dig into the theory behind transmission lines before I start simming. Does anyone have links or recommendations to literature about the subject? I am no stranger to complex math.
The driver I wish to use is a Tang Band W5-1138SMF.
Would a transmission line speaker with such a small subwoofer driver even make any sense?
I'm not looking for high SPL, but I am interested in how low I can get this little subwoofer driver to go in a properly desinged box.
Also what would happen if i tune the t line bellow fs of the driver. Let's say i tune it to 25hz
You telll us. 😉 GOOGLE is your friend. 😉
It's been a popular replacement in this TH: Reed Exodus Anarchy 25hz Tapped Horn - AVS Forum | Home Theater Discussions And Reviews
Tutorial: Simple Tapped Horn Tutorial using Hornresp - AVS Forum | Home Theater Discussions And Reviews
Google Bagend sub that has its entire usable BW below Fs + recommend reading TH inventor Tom Danley's excellent mini dissertation on it.
GM
I also want to build a pair of subs to mate with my Acoustat Monitor 3. I was planning on cloning the JBL SUB18 but after a bit of reading and discovery of this thread, I'm having second thoughts. I happen to have a pair of JBL 2203H as well. Can you guys give me some insight into how they might fare in a TL in terms of maintaining extension at Fs vs cab size? TIA
Fs 16
Qts .14
Qms 6
Qes .14
Vas 399.3
Eff 1.1
Pe 100
Xmax 5.08
Re 6.3
Le 1.4
Sd .053
Bl 21
mms 100
Flux 1.2
Fs 16
Qts .14
Qms 6
Qes .14
Vas 399.3
Eff 1.1
Pe 100
Xmax 5.08
Re 6.3
Le 1.4
Sd .053
Bl 21
mms 100
Flux 1.2
Hmm, thought I responded.......... If you input the specs in a vented box program it will spit out a small box with a large, long vent tuned to ~ 50 Hz, so an excellent driver to morph it into an inverse tapered TL [TQWT] or vented [mass loaded] variant [ML-TQWT].
With such a powerful motor, it can easily handle a very high taper ratio [10+:1].
Net Vb = ~Vas/1.44 to load to Fs, but with just ~ 5 mm Xmax it will be severely power limited down in the bass even corner loaded, though a pair should get you enough combined to meet the THX 115 dB LFE reference with ~ 5 W/ea. according to HR.
As size shrinks, so goes the bass and pretty quick it's a super low tuned mid-bass 'sub'.
GM
With such a powerful motor, it can easily handle a very high taper ratio [10+:1].
Net Vb = ~Vas/1.44 to load to Fs, but with just ~ 5 mm Xmax it will be severely power limited down in the bass even corner loaded, though a pair should get you enough combined to meet the THX 115 dB LFE reference with ~ 5 W/ea. according to HR.
As size shrinks, so goes the bass and pretty quick it's a super low tuned mid-bass 'sub'.
GM