Which midbass woofer for TL?

CharlieM · 17th November 2010, 02:37 PM

Hi all,
I happen to have two different model Aurum Cantus 10" midbass woofers lying around and I need to use a pair of them to replace the blown drivers in my TL line speakers. I'm no expert on TL's and I'm not sure if either of these speakers models would work well in a TL but I need to make a choice and go with it. The box is a 9ft tapered, bi-folded TL with sectional area equal to 125% of a 10" cone at the front of the line and 100% of cone area at the port end.

Question: Which of these woofers would work best?

Aurum Cantus AC-250F1 10" Woofer | Parts-Express.com

Aurum Cantus AC-250MKII 10" Carbon Fiber Sandwich Woofer | Parts-Express.com

thanks,
Charlie

planet10 · 17th November 2010, 03:21 PM

Using MJK rule of thumb, the line is likely too small fro any 10" and long enuff to require a driver with very low Fs. Download Martin King's TL tables (and accompanying spreadsheet) and start plugging data in until you get output similar to your line.

Quarter Wavelength Loudspeaker Design

If necessary it might be possible to shorten the line by cutting a new terminus.

dave

CharlieM · 17th November 2010, 04:14 PM

Honestly, using the MLK calculators are over this old man's head and I'm just wondering which of the two drivers I mentioned would work the best.

pieter t · 17th November 2010, 04:22 PM

I think the second one with the higher Qts will be the better choice for a TL.

planet10 · 17th November 2010, 04:43 PM

Quote:

Originally Posted by CharlieM

Honestly, using the MLK calculators are over this old man's head and I'm just wondering which of the two drivers I mentioned would work the best.

The tables are a simplified, no math required subset of the full MJK package. You plug the appropriate T/S parameters into the spreadsheet and see what it spits out.

I'd guess that most 10" are too loarge for your cross-section. Even thou Sd has nothing to do with the end result of a TL, Martin suggests 3xSd as a starting point for the closed end.

dave

planet10 · 17th November 2010, 04:45 PM

Quote:

Originally Posted by planet10

The tables

Top 2 of the links in the lower section here.

dave

bjorno · 17th November 2010, 05:46 PM

Quote:

Originally Posted by pieter t

I think the second one with the higher Qts will be the better choice for a TL.

I think the first driver is more suitable in the OP:s TL box.

b

GM · 17th November 2010, 08:10 PM

Agreed, lots more tuning options since the cab is acoustically so large for the low Qt driver. If an 'install and forget' situation though, the higher Qt driver seems a better choice overall.

GM

17th November 2010, 02:37 PM	#1
CharlieM diyAudio Member Join Date: Feb 2008 Location: Savannah, GA	Which midbass woofer for TL? Hi all, I happen to have two different model Aurum Cantus 10" midbass woofers lying around and I need to use a pair of them to replace the blown drivers in my TL line speakers. I'm no expert on TL's and I'm not sure if either of these speakers models would work well in a TL but I need to make a choice and go with it. The box is a 9ft tapered, bi-folded TL with sectional area equal to 125% of a 10" cone at the front of the line and 100% of cone area at the port end. Question: Which of these woofers would work best? Aurum Cantus AC-250F1 10" Woofer \| Parts-Express.com Aurum Cantus AC-250MKII 10" Carbon Fiber Sandwich Woofer \| Parts-Express.com thanks, Charlie __________________ http://jazzman-esl-page.blogspot.com/

17th November 2010, 03:21 PM	#2
planet10 frugal-phile(tm) diyAudio Moderator Join Date: Oct 2001 Location: Victoria, BC, NA, Sol III Blog Entries: 4	Using MJK rule of thumb, the line is likely too small fro any 10" and long enuff to require a driver with very low Fs. Download Martin King's TL tables (and accompanying spreadsheet) and start plugging data in until you get output similar to your line. Quarter Wavelength Loudspeaker Design If necessary it might be possible to shorten the line by cutting a new terminus. dave __________________ community sites t-linespeakers.org, frugal-horn.com ........ commercial site planet10-HiFi p10-hifi forum here at diyA

17th November 2010, 04:14 PM	#3
CharlieM diyAudio Member Join Date: Feb 2008 Location: Savannah, GA	Honestly, using the MLK calculators are over this old man's head and I'm just wondering which of the two drivers I mentioned would work the best. __________________ http://jazzman-esl-page.blogspot.com/

17th November 2010, 08:10 PM	#8
GM diyAudio Member Join Date: Jun 2003 Location: Chamblee, Ga.	Agreed, lots more tuning options since the cab is acoustically so large for the low Qt driver. If an 'install and forget' situation though, the higher Qt driver seems a better choice overall. GM __________________ Loud is Beautiful if it's Clean! As always though, the usual disclaimers apply to this post's contents.

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17th November 2010, 04:22 PM	#4
pieter t diyAudio Member Join Date: Apr 2009	I think the second one with the higher Qts will be the better choice for a TL.

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