TL Terminus direction

h@kan · 6th November 2009, 07:09 AM

I'm building ceiling mounted TL's (see sketch #1) and my question is if there are any problems having the terminus firing towards each other. Will there be a cancellation effect with this setup? Would it be better to place the terminus on the front as sketch #2?

Regards H@kan

chrisb · 6th November 2009, 05:03 PM

I'd go for the front terminus.

Have you tried a small pair existing speakers in that location? I wonder if you might need some damping treatment to mitigate very early reflections from the ceiling.

h@kan · 08:56 PM

Yes I think I'l go for the terminus on the front. I have tried some damping in the ceiling with this in my precent setup (see picture) and I did remove it after a while. I kind of like the sound, at least from my listening position, without it. In my case the reflections from the ceiling added something good to the listening impression. I will for sure try with and without damping in my next setup.

Regards H@kan

h@kan · 18th November 2009, 02:35 PM

I have built one of the cabinets and measured the terminus with different damping.

Driver CHR-70
Line lenght 145 cm
Taper 5:1

Simulated

Setup

Damped with foam sheets.

Resulting FR graph

Damped with sheep wool (660g)

Resulting FR graph

Driver and therminus in same graph

Regards H@kan

h@kan · 26th November 2009, 09:12 PM

Finishing up. Can't wait to listen to them in the ceiling position.

Regards H@kan

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6th November 2009, 05:03 PM	#2
chrisb diyAudio Member Join Date: Aug 2002 Location: victoria BC	I'd go for the front terminus. Have you tried a small pair existing speakers in that location? I wonder if you might need some damping treatment to mitigate very early reflections from the ceiling. __________________ you don't really believe everything you think, do you? community sites t-linespeakers.org, frugal-horn.com commercial site planet10-HiFi

18th November 2009, 02:35 PM	#4
h@kan diyAudio Member Join Date: Apr 2008 Location: North of Sweden	I have built one of the cabinets and measured the terminus with different damping. Driver CHR-70 Line lenght 145 cm Taper 5:1 Simulated Setup Damped with foam sheets. Resulting FR graph Damped with sheep wool (660g) Resulting FR graph Driver and therminus in same graph Regards H@kan

26th November 2009, 09:12 PM	#5
h@kan diyAudio Member Join Date: Apr 2008 Location: North of Sweden	Finishing up. Can't wait to listen to them in the ceiling position. Regards H@kan

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