In ground transmission line

Jamh · 23rd May 2006, 07:53 PM

Hi everyone,

As I am building a living room from scratch, I was thinking of the following for a TL speaker. Most of the transmission line would be between the floor joists, so that the speakers would not stand out too much. What do you think?

Of course, I better make sure of the speaker positioning

Any recommendations on drivers and a way to calculate sizes?

Thanks,
Jam

Jamh · 23rd May 2006, 09:42 PM

About the choice of drivers, in my last project I used the jordan Jx92s's. They worked well, I was just curious if there were any new drivers I should be aware of.

Dumbass · 24th May 2006, 12:33 AM

This would be the kind of situation that would be good for infinite-baffle subwoofer.

Bob Brines · 24th May 2006, 12:48 PM

For sure! If you have the attic/basement space to use as a back chamber, IB is the only way to go. Check out http://ibsubwoofers.proboards51.com/

Bob

Jamh · 24th May 2006, 03:45 PM

Thanks Bob, that was fun reading!

Personally, I'm more into a single full-range driver strictly for music (vinyl at that). I'd like to hear the opinion of people about:

a) Cost no object driver for this application (including vintage stuff like Altec).

b) Best cost/perf driver and what it sacrifices wrt a).

Jamh · 26th May 2006, 03:21 PM

Has anyone done a comparison between drivers for FR applications? Or a survey to see which ones are the most used?

Dumbass · 26th May 2006, 04:17 PM

First, I still vote for IB subwoofer. Even 8" fullrangers like Lowther in the biggest best rearloaded horn enclosures lack that bottom octave. And sub frequencies aren't just for explosions and dinosaurs, IMO they add the last touch of realism to a hi-fi setup.

Concerning a comparison of full-range drivers, you are talking about a huge variety of "flavors", each one valid, each one with pluses and minuses.

I think the Jordan is an excellent driver. I heard a pair and was really impressed with the quality of mids and highs, and acoustic bass sounded good, although lacking visceral punch. Here are my feelings/conjectures/prejudices about this driver:
- they can be used in small rooms nearfield in a full-range setting and completely satisfy. I am thinking of Tom Z's setup: http://www.audio-resolution.com/zhorn/jordanroom.jpg
- in a normal sized living room, they simply can not give hi-fidelity realistic SPL unless they are cut off around 150Hz and handed over to a bass driver. (I can't remember the exact numbers, I ran from Linkwitz's SPL calculator.) This is simply a function of their radiating area. Some people will say, oh put them in the correct enclosure, etc etc.
- some people have this weird idea that single driver = SET amplification. The Jordan wants more wattage, simply a function of their low efficiency.

Jamh · 27th May 2006, 02:05 AM

Quote:

Originally posted by Dumbass
Concerning a comparison of full-range drivers, you are talking about a huge variety of "flavors", each one valid, each one with pluses and minuses.

That's exactly what I'm looking for. Does this information exist somewhere?

johninCR · 27th May 2006, 02:44 AM

The LDSG is the most comprehensive guide I've seen along the line of what you want, although it hasn't been updated in some time. It's a great place to start. http://ldsg.snippets.org/index.php3

27th May 2006, 02:44 AM	#9
johninCR diyAudio Member Join Date: Apr 2004 Location: Costa Rica	The LDSG is the most comprehensive guide I've seen along the line of what you want, although it hasn't been updated in some time. It's a great place to start. http://ldsg.snippets.org/index.php3 __________________ Everyone has a photographic memory. It's just that most are out of film.

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23rd May 2006, 09:42 PM	#2
Jamh diyAudio Member Join Date: Dec 2003 Location: sacramento	About the choice of drivers, in my last project I used the jordan Jx92s's. They worked well, I was just curious if there were any new drivers I should be aware of.

24th May 2006, 12:33 AM	#3
Dumbass diyAudio Member Join Date: Mar 2003 Location: British Antarctic Territory	This would be the kind of situation that would be good for infinite-baffle subwoofer.

24th May 2006, 12:48 PM	#4
Bob Brines diyAudio Member Join Date: Jan 2003 Location: Hot Spring Village AR	For sure! If you have the attic/basement space to use as a back chamber, IB is the only way to go. Check out http://ibsubwoofers.proboards51.com/ Bob

24th May 2006, 03:45 PM	#5
Jamh diyAudio Member Join Date: Dec 2003 Location: sacramento	Thanks Bob, that was fun reading! Personally, I'm more into a single full-range driver strictly for music (vinyl at that). I'd like to hear the opinion of people about: a) Cost no object driver for this application (including vintage stuff like Altec). b) Best cost/perf driver and what it sacrifices wrt a).

26th May 2006, 03:21 PM	#6
Jamh diyAudio Member Join Date: Dec 2003 Location: sacramento	Has anyone done a comparison between drivers for FR applications? Or a survey to see which ones are the most used?

26th May 2006, 04:17 PM	#7
Dumbass diyAudio Member Join Date: Mar 2003 Location: British Antarctic Territory	First, I still vote for IB subwoofer. Even 8" fullrangers like Lowther in the biggest best rearloaded horn enclosures lack that bottom octave. And sub frequencies aren't just for explosions and dinosaurs, IMO they add the last touch of realism to a hi-fi setup. Concerning a comparison of full-range drivers, you are talking about a huge variety of "flavors", each one valid, each one with pluses and minuses. I think the Jordan is an excellent driver. I heard a pair and was really impressed with the quality of mids and highs, and acoustic bass sounded good, although lacking visceral punch. Here are my feelings/conjectures/prejudices about this driver: - they can be used in small rooms nearfield in a full-range setting and completely satisfy. I am thinking of Tom Z's setup: http://www.audio-resolution.com/zhorn/jordanroom.jpg - in a normal sized living room, they simply can not give hi-fidelity realistic SPL unless they are cut off around 150Hz and handed over to a bass driver. (I can't remember the exact numbers, I ran from Linkwitz's SPL calculator.) This is simply a function of their radiating area. Some people will say, oh put them in the correct enclosure, etc etc. - some people have this weird idea that single driver = SET amplification. The Jordan wants more wattage, simply a function of their low efficiency.