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Old 8th January 2011, 11:01 PM   #1
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Cool 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.
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Old 8th January 2011, 11:59 PM   #2
OscarS is offline OscarS  United States
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Whats the question?
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Old 9th January 2011, 12:43 AM   #3
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Default 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?
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Old 9th January 2011, 12:50 AM   #4
OscarS is offline OscarS  United States
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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?
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Old 9th January 2011, 12:55 AM   #5
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What driver are you using?

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Old 9th January 2011, 01:08 AM   #6
OscarS is offline OscarS  United States
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Pretty sure it's this one: Aurasound NS8-385-4A 8" Woofer
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Old 9th January 2011, 03:22 AM   #7
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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)

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File Type: gif Aura-8-TL.gif (18.7 KB, 401 views)
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Old 9th January 2011, 04:40 AM   #8
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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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Old 9th January 2011, 05:23 AM   #9
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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.

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Old 9th January 2011, 09:10 PM   #10
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Default Manage Attachments

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