TL port position

cs · 20th October 2006, 11:21 AM

The advice generally given with loudspeakers is not to position them too close to room boundaries, so as not to give a boomy response.

But with transmission line (TL) speakers, the port is very often positioned low down in the cabinet, and therefore close to the floor.

Would it therefore be better to arrange the internal line folding such that the port emerged close to the drive unit, near the top of the cabinet ? After all, at the low frequencies, the port is responsible for half of the sound pressure.

sreten · 20th October 2006, 12:01 PM

Hi,

The short answer is yes, and it is done, see Rega Naos, Seas Thor etc.

/sreten.

roland bios · 20th October 2006, 01:21 PM

Hi There

The longer answer is "varies". The extra lift from the floor gives you the possibility to design much lower tuned tl's without a boomy bass.

Something like this:
Half tl

This mini tl speaker is purposly built with floor and wall bass lift in mind. If used in small rooms it give's an even and very low bass. I designed it with the German program Aj-Horn.

Best Regards
Roland Breteler
Crafty loudspeakers

20th October 2006, 11:21 AM	#1
cs diyAudio Member Join Date: Jun 2005 Location: .	TL port position The advice generally given with loudspeakers is not to position them too close to room boundaries, so as not to give a boomy response. But with transmission line (TL) speakers, the port is very often positioned low down in the cabinet, and therefore close to the floor. Would it therefore be better to arrange the internal line folding such that the port emerged close to the drive unit, near the top of the cabinet ? After all, at the low frequencies, the port is responsible for half of the sound pressure.

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20th October 2006, 12:01 PM	#2
sreten diyAudio Member Join Date: Nov 2003 Location: Brighton UK	Hi, The short answer is yes, and it is done, see Rega Naos, Seas Thor etc. /sreten.

20th October 2006, 01:21 PM	#3
roland bios diyAudio Member Join Date: Jul 2004 Location: Groningen	Hi There The longer answer is "varies". The extra lift from the floor gives you the possibility to design much lower tuned tl's without a boomy bass. Something like this: Half tl This mini tl speaker is purposly built with floor and wall bass lift in mind. If used in small rooms it give's an even and very low bass. I designed it with the German program Aj-Horn. Best Regards Roland Breteler Crafty loudspeakers

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