help!!! design a T-line enclosure for the "wrong woofer"

ningures · 6th October 2006, 05:06 PM

I have some units of an amazing woofer that I really want to use...because I already have them, and they are fantastic (despite the problem explained below)
I am triying to design a 2 way speaker using one or two of these driver to play the lower part of the frequency spectrum...
The problem is tha because of the nature of the design of the woofer (short excursion, high resonance frequency), when I run the values in my usual speaker enclosure software, no matter whether its a sealed or ported design, the outcome is a box that will start a smooth roll off from 100 Hz down...resulting probably in a speaker with very little low frequency energy output...Don´t get me wrong I dont expect it to go really deep and low...I´ll be happy to be playing at around -6 dB around 50-55 Hz...not -3 db already at a 100 Hz!!!
So my question is:
Is there anybody with experiencie designing T-Line speakers, and do you believe I could make the sytem resonate in alower frequency by using that type of concept?
...or do you think I should surrender and go for a 3 way design with a more suitable woofer "underneath" it?
THANKS!!!

vinylkid58 · 6th October 2006, 05:19 PM

Well you could go 2-way with the drivers you have and fill in the bottom with a sub.
If you post the TS numbers for your woofer, someone will help you.

Jeff

joe carrow · 6th October 2006, 05:29 PM

Generally, you don't get much more bass out of a driver by using a transmission line. I tried this once, and although the bass would go low I needed a LOT of EQ to get the bass up to the same level as the mids and highs.

If the driver has short excursion, high Fs, and low Qts, maybe it's more suited to use in a horn.

sdclc126 · 6th October 2006, 06:02 PM

You might try going to http://www.t-linespeakers.org/ and take a look around.

But yeah, for a woofer that starts to roll off at 100 hz you're probably better off adding a sub to the system, rather than trying to squeeze low end from a driver that's really not designed for it. Use it in the band it performs best at - your ears will thank you for it.

e-side · 7th October 2006, 07:24 PM

A couple of years ago, when I didn't have the knowledge and materials to measure the drivers parameters, I had a dual voice coil driver for which I built a closed box and hoped that it worked well. The system didn't produce any bass. After measurements, the driver seemed to have a low Qts with the voice coils wired in series, explaining the lack of bass in the closed box.

As far as I know (traditional) transmission line systems resemble closed box (Q=0.5) behaviour, so you might get disappointing results using that driver in such an enclosure.

6th October 2006, 05:06 PM	#1
ningures diyAudio Member Join Date: Oct 2006	help!!! design a T-line enclosure for the "wrong woofer" I have some units of an amazing woofer that I really want to use...because I already have them, and they are fantastic (despite the problem explained below) I am triying to design a 2 way speaker using one or two of these driver to play the lower part of the frequency spectrum... The problem is tha because of the nature of the design of the woofer (short excursion, high resonance frequency), when I run the values in my usual speaker enclosure software, no matter whether its a sealed or ported design, the outcome is a box that will start a smooth roll off from 100 Hz down...resulting probably in a speaker with very little low frequency energy output...Don´t get me wrong I dont expect it to go really deep and low...I´ll be happy to be playing at around -6 dB around 50-55 Hz...not -3 db already at a 100 Hz!!! So my question is: Is there anybody with experiencie designing T-Line speakers, and do you believe I could make the sytem resonate in alower frequency by using that type of concept? ...or do you think I should surrender and go for a 3 way design with a more suitable woofer "underneath" it? THANKS!!!

6th October 2006, 06:02 PM	#4
sdclc126 diyAudio Member Join Date: Jan 2005 Location: San Diego, CA	You might try going to http://www.t-linespeakers.org/ and take a look around. But yeah, for a woofer that starts to roll off at 100 hz you're probably better off adding a sub to the system, rather than trying to squeeze low end from a driver that's really not designed for it. Use it in the band it performs best at - your ears will thank you for it. __________________ Soft Dome

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6th October 2006, 05:19 PM	#2
vinylkid58 diyAudio Member Join Date: May 2005 Location: Victoria, B.C.	Well you could go 2-way with the drivers you have and fill in the bottom with a sub. If you post the TS numbers for your woofer, someone will help you. Jeff

6th October 2006, 05:29 PM	#3
joe carrow diyAudio Member Join Date: May 2004 Location: San Francisco	Generally, you don't get much more bass out of a driver by using a transmission line. I tried this once, and although the bass would go low I needed a LOT of EQ to get the bass up to the same level as the mids and highs. If the driver has short excursion, high Fs, and low Qts, maybe it's more suited to use in a horn.

7th October 2006, 07:24 PM	#5
e-side diyAudio Member Join Date: Jun 2005 Location: The Netherlands	A couple of years ago, when I didn't have the knowledge and materials to measure the drivers parameters, I had a dual voice coil driver for which I built a closed box and hoped that it worked well. The system didn't produce any bass. After measurements, the driver seemed to have a low Qts with the voice coils wired in series, explaining the lack of bass in the closed box. As far as I know (traditional) transmission line systems resemble closed box (Q=0.5) behaviour, so you might get disappointing results using that driver in such an enclosure.