Horn at front, transmission line at rear?

Circlotron · 7th October 2003, 01:47 PM

Can it be done sucessfully, or is it any use in fact? I just started thinking about it because the TL at the rear gets smaller as it goes along, sort of the opposite of the horn at the front.

kelticwizard · 7th October 2003, 03:43 PM

Circlotron:

Transmission Lines and ported enclosures share many design features. An unstuffed Transmission Line has an impedance curve similar to a ported box's.

Wasn't the Altec Voice Of The Theatre horn loaded in front for mids and ported in back for bass? I believe there are several other designs that are horn in front, ported in back.

I would think that if you can do that, you can do a Transmission Line in back to substitue for the ported chamber. After all, the Bose Sound Cannon substitutes two tuned columns for the two ported chambers in a sixth order bandpass enclosure, and it seems to work both sonically and commercially. I would think you could swap a Transmission Line for a ported chamber in most cases, if you have the time to work out the details.

slowmotion · 7th October 2003, 07:57 PM

Hi Circlotron, all

A bit like the Tannoy Westminster ?
It has a front horn and a back "horn".
Never heard it , but it is supposed to sound very good.

With a transmission line instead of a back horn there will of course be different
sensitivity between the front horn and the back transmission line,
a bit of equalisation would maybe take care of that.

Sounds like an interesting idea

cheers

7th October 2003, 01:47 PM	#1
Circlotron diyAudio Member Join Date: Jun 2002 Location: Melbourne, Australia	Horn at front, transmission line at rear? Can it be done sucessfully, or is it any use in fact? I just started thinking about it because the TL at the rear gets smaller as it goes along, sort of the opposite of the horn at the front. __________________ Best-ever T/S parameter spreadsheet. http://www.diyaudio.com/forums/multi...tml#post353269

7th October 2003, 03:43 PM	#2
kelticwizard diyAudio Member Join Date: Sep 2001 Location: Connecticut, The Nutmeg State	Circlotron: Transmission Lines and ported enclosures share many design features. An unstuffed Transmission Line has an impedance curve similar to a ported box's. Wasn't the Altec Voice Of The Theatre horn loaded in front for mids and ported in back for bass? I believe there are several other designs that are horn in front, ported in back. I would think that if you can do that, you can do a Transmission Line in back to substitue for the ported chamber. After all, the Bose Sound Cannon substitutes two tuned columns for the two ported chambers in a sixth order bandpass enclosure, and it seems to work both sonically and commercially. I would think you could swap a Transmission Line for a ported chamber in most cases, if you have the time to work out the details. __________________ "A friend will help you move. A really good friend will help you move a body." -Anonymous

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7th October 2003, 07:57 PM	#3
slowmotion diyAudio Member Join Date: Nov 2002 Location: Norge	Hi Circlotron, all A bit like the Tannoy Westminster ? It has a front horn and a back "horn". Never heard it , but it is supposed to sound very good. With a transmission line instead of a back horn there will of course be different sensitivity between the front horn and the back transmission line, a bit of equalisation would maybe take care of that. Sounds like an interesting idea cheers

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