Transmission lines

duderduderini · 28th July 2007, 11:21 PM

Hi There
Has anybody had success in a tl design.
I have some 12 inch carbon fibre woofers i want to use in a tl design.
Audioexpress website has a tl design cd.. Has anybody tried that?
Thanks.
Nick

Dr.EM · 29th July 2007, 08:18 AM

I had success with a TL design drawn by the people on this board with Martin King's mathcad sheets. Very pleased with the enclosure, gives a different sound to any other design I've heard and the bass keeps going lower and lower without suddenly dissapearing (its a small sub design).

Those worksheets are available but perhaps someone would model it if you told us the model of the driver. Usually a high Qms of around 3-6, a low Qes around 0.3-0.4 and a low Qts of about 0.3-0.4 work well combined with a relatively low resonance frequency (30Hz would be good). If your parameters are way outside this you may not be met with such success.

duderduderini · 29th July 2007, 11:56 AM

Hi
The speaker is a 12 inch carbon fibre model with the brand name Response. This Is a brand of speaker sold in australia for some time by Jaycar electronics.
Here are the parameters
spl93
vas 230 litres
Fs 21.3 Hz
Qts 0.35
Qes 0.36
Qms 8.71
z 8ohms
I plan to use this woofer as a basis for my 3 way. Driving amp will be a paralell 300b of around 15 to 18 watts
Thanks for your help
Nick

28th July 2007, 11:21 PM	#1
duderduderini diyAudio Member Join Date: Mar 2004 Location: Albury NSW Australia	Transmission lines Hi There Has anybody had success in a tl design. I have some 12 inch carbon fibre woofers i want to use in a tl design. Audioexpress website has a tl design cd.. Has anybody tried that? Thanks. Nick __________________ "Better to say nothing and keep them guessing than to speak and remove all doubt."

29th July 2007, 11:56 AM	#3
duderduderini diyAudio Member Join Date: Mar 2004 Location: Albury NSW Australia	Driver Parameters Hi The speaker is a 12 inch carbon fibre model with the brand name Response. This Is a brand of speaker sold in australia for some time by Jaycar electronics. Here are the parameters spl93 vas 230 litres Fs 21.3 Hz Qts 0.35 Qes 0.36 Qms 8.71 z 8ohms I plan to use this woofer as a basis for my 3 way. Driving amp will be a paralell 300b of around 15 to 18 watts Thanks for your help Nick __________________ "Better to say nothing and keep them guessing than to speak and remove all doubt."

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29th July 2007, 08:18 AM	#2
Dr.EM diyAudio Member Join Date: Oct 2006 Location: Swindon	I had success with a TL design drawn by the people on this board with Martin King's mathcad sheets. Very pleased with the enclosure, gives a different sound to any other design I've heard and the bass keeps going lower and lower without suddenly dissapearing (its a small sub design). Those worksheets are available but perhaps someone would model it if you told us the model of the driver. Usually a high Qms of around 3-6, a low Qes around 0.3-0.4 and a low Qts of about 0.3-0.4 work well combined with a relatively low resonance frequency (30Hz would be good). If your parameters are way outside this you may not be met with such success.