Transmission Line Woofer

Gary Hubbard · 8th January 2011, 11:01 PM

Hello speaker builders: I am working on a design for a tapered QW line to handle the two Aurasound 8" drivers bought from Madisound. I am somewhat surprised that there have been so few posts on Transmission line bass units. I will post pictures of my OB main range speakers (MTM seas 11fgx with Dynaudio Esotech D260) - nice sound but need some bass fill in the 40-150 Hz range.

OscarS · 8th January 2011, 11:59 PM

Whats the question?

Gary Hubbard · 9th January 2011, 12:43 AM

Sorry about that. The question concerns the length of line for that speaker (resonance - 40 Hz) in a shared cabinet with drivers on either side and a 2.33 - 1 taper (49"squared tapering to 21"square) in common in the center. The line will be stuffed with long hair wool and lined with "finger foam". Does that sound like a workable bass format with .34 Qts driver?

OscarS · 9th January 2011, 12:50 AM

I see. Let me see if I still have that one AKABAK script for TLs. Hopefully a TL expert will chime in, but in the meantime, I'll see if I can model it. Did you pick up those Auras through that nice Madisound sale?

planet10 · 9th January 2011, 12:55 AM

What driver are you using?

dave

OscarS · 9th January 2011, 01:08 AM

Pretty sure it's this one: Aurasound NS8-385-4A 8" Woofer

planet10 · 9th January 2011, 03:22 AM

Martin's tables suggest that with taper of 2.33:1, for 2 drivers (SS snapshot is for single driver), the closed end should be 82 in^2, closed end 35.3 in^2 and a driver offset of 23.25" (the last number calculated manually, the SS seems to be spewing garbage on that for this driver)

dave

Gary Hubbard · 9th January 2011, 04:40 AM

I am trying to addphotos of my main speakers but can't seem to get them from i-photo on this page. What am I doing wrong?

planet10 · 9th January 2011, 05:23 AM

Usually you need to resample the picture down to lower resolution -- i open the picture in photoshop, manipulate, and save for web. If limited to iPhoto, select the image, File>Export, scale the image (no larger than 1000x1000 is a good target), clik OK (or export or whatever the button says), give it a real name (not necessary, but always good practice), save it somewhere you can find it (i have an antique, a newer version of iPhoto may be a bit different)

Back to the forum, click manage attachments, a manage attachments window pops up, select it and then upload the picture. It will get attached to your post.

dave

Gary Hubbard · 9th January 2011, 09:10 PM

Thanks Planet 10, I appreciate your help and I must be blind cause I cannot find "manage attachments".

8th January 2011, 11:01 PM	#1
Gary Hubbard diyAudio Member Join Date: Dec 2008 Location: Rockford, IL	Transmission Line Woofer Hello speaker builders: I am working on a design for a tapered QW line to handle the two Aurasound 8" drivers bought from Madisound. I am somewhat surprised that there have been so few posts on Transmission line bass units. I will post pictures of my OB main range speakers (MTM seas 11fgx with Dynaudio Esotech D260) - nice sound but need some bass fill in the 40-150 Hz range.

9th January 2011, 12:43 AM	#3
Gary Hubbard diyAudio Member Join Date: Dec 2008 Location: Rockford, IL	Transmission Line: Sorry about that. The question concerns the length of line for that speaker (resonance - 40 Hz) in a shared cabinet with drivers on either side and a 2.33 - 1 taper (49"squared tapering to 21"square) in common in the center. The line will be stuffed with long hair wool and lined with "finger foam". Does that sound like a workable bass format with .34 Qts driver?

9th January 2011, 12:55 AM	#5
planet10 frugal-phile(tm) diyAudio Moderator Join Date: Oct 2001 Location: Victoria, BC, NA, Sol III Blog Entries: 4	What driver are you using? dave __________________ community sites t-linespeakers.org, frugal-horn.com ........ commercial site planet10-HiFi p10-hifi forum here at diyA

9th January 2011, 05:23 AM	#9
planet10 frugal-phile(tm) diyAudio Moderator Join Date: Oct 2001 Location: Victoria, BC, NA, Sol III Blog Entries: 4	Usually you need to resample the picture down to lower resolution -- i open the picture in photoshop, manipulate, and save for web. If limited to iPhoto, select the image, File>Export, scale the image (no larger than 1000x1000 is a good target), clik OK (or export or whatever the button says), give it a real name (not necessary, but always good practice), save it somewhere you can find it (i have an antique, a newer version of iPhoto may be a bit different) Back to the forum, click manage attachments, a manage attachments window pops up, select it and then upload the picture. It will get attached to your post. dave __________________ community sites t-linespeakers.org, frugal-horn.com ........ commercial site planet10-HiFi p10-hifi forum here at diyA

9th January 2011, 09:10 PM	#10
Gary Hubbard diyAudio Member Join Date: Dec 2008 Location: Rockford, IL	Manage Attachments Thanks Planet 10, I appreciate your help and I must be blind cause I cannot find "manage attachments".


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8th January 2011, 11:59 PM	#2
OscarS diyAudio Member Join Date: Jan 2011	Whats the question?

9th January 2011, 12:50 AM	#4
OscarS diyAudio Member Join Date: Jan 2011	I see. Let me see if I still have that one AKABAK script for TLs. Hopefully a TL expert will chime in, but in the meantime, I'll see if I can model it. Did you pick up those Auras through that nice Madisound sale?

9th January 2011, 01:08 AM	#6
OscarS diyAudio Member Join Date: Jan 2011	Pretty sure it's this one: Aurasound NS8-385-4A 8" Woofer

9th January 2011, 04:40 AM	#8
Gary Hubbard diyAudio Member Join Date: Dec 2008 Location: Rockford, IL	I am trying to addphotos of my main speakers but can't seem to get them from i-photo on this page. What am I doing wrong?

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