A twin-WR125ST tower concept - diyAudio
Go Back   Home > Forums > Loudspeakers > Multi-Way

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
Reply
 
Thread Tools Search this Thread
Old 11th August 2008, 05:48 AM   #1
diyAudio Member
 
Brisso57's Avatar
 
Join Date: Sep 2005
Location: the leafy west of Brisbane
Default A twin-WR125ST tower concept

I have two pairs of WR125ST's which I've been experimenting with and I'm launching this concept with Tim's Alegria Audio Rosa floorstander as a jumping-off point.

Here's the link: homepage.mac.com/tlinespeakers/FAL/box-plans/rosa-wr125-TMM-map.gif
(Thanks to Dave D at Planet 10 for hosting the box plan library.)

1. I'm intending to use twin WR125ST's
2. I'm flexible about the tweeter, but at the moment I have a pair of Foster ribbons, which I like, and which (to my ears) sound suited for the purpose.
3. I plan to use the same cabinet volume, port diam & length, and general shape (tall floor-stander).
4. I plan to use some novel (or at least unusual) materials to make construction easy.

Attached is my first concept sketch. It shows - in plan x-section - the general arrangement. The tweeter isn't shown, but it is mounted above the two WR's, and all three are mounted as close as possible together, and are centralised on the front baffle.

The "sides" are two hemi-cylinders of PVC stormwater pipe.

The front baffle and the rear plate will be held apart by rectangular bits of MDF/ply. These COULD be "Swiss-cheesed", a la Planet-10, but I don't see the need, as there will be a top-to-bottom "half-pipe" on either side. The edges of the PVC pipe will fit flush with the front (& rear) baffle because there will be a step routed for the full height either side front (& rear). On final assembly the pipe edges will be glued to the baffles. For test-fits, the whole lot can be held assembled with straps/tape.

The top and base will be a bit tricky to cut, but will basically just plug flush with the end of the "tube".

To finish the whole thing, I plan to just wrap the thing in veneer! (Should be easy!)

Anyone interested in building a pair also?

cheers

Doug
Attached Images
File Type: jpg mutant rosa pic 4.jpg (39.2 KB, 321 views)
__________________
A speaker-builder's parable: "That burned down, fell over, then sank into the swamp. But the fourth one stayed up. And that's what you're going to get, Lad, the strongest castle of all."
  Reply With Quote
Old 11th August 2008, 09:52 AM   #2
sfreak is offline sfreak  Australia
diyAudio Member
 
sfreak's Avatar
 
Join Date: Apr 2006
Location: Tasmania, Australia
Look interesting Doug. Thought about diffracting the rear of the cabinets? I know the WR/FR in shallow boxes work well when there is some sort of diffraction device inside (rebated circles, foam triangles etc).

As for tweeter, and being WR125STs, you have near unlimited options. Well, comes down to sensitivity and the like, but you can get away with a crossover point that works best with the tweeter, not a combination of trade offs for either driver. Experiment with other tweeters, you may even find one that sounds better to your ears than the Foster!
  Reply With Quote
Old 11th August 2008, 10:58 AM   #3
diyAudio Member
 
Brisso57's Avatar
 
Join Date: Sep 2005
Location: the leafy west of Brisbane
Quote:
Originally posted by sfreak
Look interesting Doug. Thought about diffracting the rear of the cabinets? I know the WR/FR in shallow boxes work well when there is some sort of diffraction device inside (rebated circles, foam triangles etc).
Thanks Dan. I'll try this.
I presume that the effect (of diffraction from the back wall) lessens with distance from the projected centre of the drivers. Is there any guiding rule of thumb with regard to at what distance additional diffraction surface gives no further gains? (So, for example can we say 200% of the projected area? 400%?) How much is enough?

cheers

Doug
__________________
A speaker-builder's parable: "That burned down, fell over, then sank into the swamp. But the fourth one stayed up. And that's what you're going to get, Lad, the strongest castle of all."
  Reply With Quote

Reply


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
BIB utilising twin CSS WR125ST's? Brisso57 Full Range 26 14th March 2009 12:37 PM
Where to cross in a supertweeter with 2 WR125ST's? Brisso57 Multi-Way 15 19th December 2007 08:23 PM
WR125ST's - 2 x matched pairs mrpopgun Swap Meet 8 10th February 2007 05:42 PM
New WR125ST TL design Timn8ter Full Range 43 16th June 2005 07:36 PM
WR125ST quadpole? audiobomber Full Range 23 24th May 2005 10:23 PM


New To Site? Need Help?

All times are GMT. The time now is 08:56 PM.


vBulletin Optimisation provided by vB Optimise (Pro) - vBulletin Mods & Addons Copyright © 2014 DragonByte Technologies Ltd.
Copyright 1999-2014 diyAudio

Content Relevant URLs by vBSEO 3.3.2