TD15M woofer with Geddes 12" waveguide - diyAudio
Go Back   Home > Forums > Loudspeakers > Multi-Way
Home Forums Rules Articles diyAudio Store Gallery Wiki Blogs Register Donations FAQ Calendar Search Today's Posts Mark Forums Read

Multi-Way Conventional loudspeakers with crossovers

Please consider donating to help us continue to serve you.

Ads on/off / Custom Title / More PMs / More album space / Advanced printing & mass image saving
Thread Tools Search this Thread
Old 13th October 2011, 01:41 AM   #1
drchait is offline drchait  United States
diyAudio Member
Join Date: Jul 2009
Default TD15M woofer with Geddes 12" waveguide

I have to choose between the acoustic Elegance TD12M

AE Speakers --- Superb Quality, Unforgettable Performance, Definitely.

and the TD15M.

AE Speakers --- Superb Quality, Unforgettable Performance, Definitely.

For a dipole speaker I am designing. The woofer needs only go down to 300Hz. I would rather use the TD15M if I can get it to work. It has 3db more headroom a curve linear cone and from the forums I have read it has "superior midrange sound".
I am looking at using the TD12M or the TD15M with a 12 inch diameter Autotech OSWG Geddes type waveguide crossed over about 1300Hz.

DIY Sound Group

The Geddes wave guide must be crossed over above 1200 Hz according to the literature. In the Geddes literature you are supposed to use the same size waveguide as the woofer dimensions to obtain a constant directivity system. I have read that the TD15M has wider dispersion from 1000Hz to 2000Hz than normal 15 inch woofers because of its phase plug, and has good off axis response up to 2K. Can I get the constant directivity that I am after with the TD15M and a 12 inch wave guide, or will I have to use the TD12M. I am also concerned that the driver to driver distance will be larger than 1 wavelength at crossover with the 15 inch driver. I know the emerald physics dipoles used a 12" waveguide with a 15" woofer and it was a pretty succesful design. Anyone who is familiar with AE speakers or can just give an opinion is extremely appreciated.


  Reply With Quote
Old 13th October 2011, 04:36 AM   #2
Account disabled at member's request
Join Date: Apr 2010
Location: Between cities!
What is your main design goal here? If it is achieving constant directivity then you are on the right track. But if you are going for the best sound quality then you need to re-think it, in my opinion.

I'll be controversial and say that the TD12M will not sound great playing up that high, nor will any other 12 inch woofer. This is from my listening experience only, others will have a different opinion. I would personally look into a high efficiency 8inch mid that should easily get down to 300hz and play more cleanly up to the crossover point.

If on the other hand you are mainly looking for a home theatre speaker then a large woofer as mid should be fine. I havent heard the TD15M but apparently it beats the 12 for midrange performance. You could also look into the Altec woofers made by Great Plains Audio. A lower cross over point can be had by using the 15" SEOS waveguide being developed by some of the guys at the AVS forum:

Hey guys...we need a little rallying here... - Page 31 - AVS Forum
  Reply With Quote
Old 13th October 2011, 05:35 AM   #3
ScottG is offline ScottG  United States
diyAudio Member
Join Date: Feb 2003
Location: US
I can see Earl cringing on this one..
perspective is everything
  Reply With Quote
Old 13th October 2011, 05:44 AM   #4
diyAudio Member
Join Date: May 2010
I am using a TD12X up to about 1400hz in a two way, it works really good. The sound quality of these drivers are amazing, also in the midrange. I think the TD15M is the best driver for the task.
  Reply With Quote


Hide this!Advertise here!
Thread Tools Search this Thread
Search this Thread:

Advanced Search

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off

Similar Threads
Thread Thread Starter Forum Replies Last Post
Critique my 8" Pro Audio Woofer 8" Waveguide / Compression Driver Plans gibbed Multi-Way 21 9th March 2011 08:55 PM
1.5" Ciare MT320 Mounted in a Modified 12" PE Waveguide opc Multi-Way 2 14th February 2011 04:35 PM
My 10" woofer / waveguide 2-way dabbler Multi-Way 11 10th December 2010 01:24 AM
Wanted: Volt 12" and 15" woofer gengis Swap Meet 0 12th April 2005 12:29 PM
WTB: Focal & Audiom & Volts 11", 12", 13", 15" woofer gengis Swap Meet 0 17th March 2005 02:29 AM

New To Site? Need Help?

All times are GMT. The time now is 09:22 AM.

vBulletin Optimisation provided by vB Optimise (Pro) - vBulletin Mods & Addons Copyright © 2017 DragonByte Technologies Ltd.
Copyright 1999-2017 diyAudio

Content Relevant URLs by vBSEO 3.3.2