Go Back   Home > Forums > >
Home Forums Rules Articles diyAudio Store Blogs Gallery Wiki Register Donations FAQ Calendar Search Today's Posts Mark Forums Read

Aucharm UR330B8-11F full range 12" cabinet ideas?
Aucharm UR330B8-11F full range 12" cabinet ideas?
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 7th October 2018, 10:29 PM   #11
GM is offline GM  United States
diyAudio Member
 
GM's Avatar
 
Join Date: Jun 2003
Location: Chamblee, Ga.
Quote:
Originally Posted by Lingwendil View Post
Are those dimensions in inches accurate? 153 inches?

I'm having a hard time visualising this...
Yes, inches squared [I forgot the ^], i.e. 153"^2 = cross sectional area of the cab, so you decide the width x depth.

This is a vented column speaker [aka MLTL nowadays] that has a high enough aspect ratio for its 1/4 WL TL resonances to damp the driver and vent to the point where if you size the vent per simple reflex/vented alignments the cab will be tuned somewhat lower than predicted.

All the mind numbing techno babble plus a lot more here: Quarter Wavelength Loudspeaker Design

GM
__________________
Loud is Beautiful if it's Clean! As always though, the usual disclaimers apply to this post's contents.
  Reply With Quote
Old 7th October 2018, 10:38 PM   #12
GM is offline GM  United States
diyAudio Member
 
GM's Avatar
 
Join Date: Jun 2003
Location: Chamblee, Ga.
Quote:
Originally Posted by freddi View Post
maybe someone here can guess how this arrangement of an open top pipe might work in practice - - one variant for the rear slot is "K-ish"
Well, they would mimic any number of spray/bleed nozzles used in fuel, etc., systems.

Shades of B0$3 'cherry picking', with others being Klipsch, Jensen, R-J, etc......... apparently all those earlier patents had been abandoned by '60. Noticed they misspelled Voight's name [Voigt] among other words .

GM
__________________
Loud is Beautiful if it's Clean! As always though, the usual disclaimers apply to this post's contents.

Last edited by GM; 7th October 2018 at 10:45 PM.
  Reply With Quote
Old 7th October 2018, 10:44 PM   #13
freddi is offline freddi  United States
diyAudio Member
 
freddi's Avatar
 
Join Date: Aug 2005
Aucharm UR330B8-11F full range 12" cabinet ideas?
- here's my contribution - a relatively shallow K-ish baffle - aperture could be more curved - too much trouble with "Paint" - invert the rear aperture.

de-Q-ing hole array in the baffle might help (?)

I did that with a $10 Boss 6x9 - could have lived with it other than cardboard and duct tape


Click the image to open in full size.

I think this shallow Kazba baffle could sound pretty good.

If one took the Acoustic Control 115BK cabinet and scaled it to ~K15 bulk then the following might happen
assuming an amp with low output Z

Click the image to open in full size.

Last edited by freddi; 7th October 2018 at 10:58 PM.
  Reply With Quote
Old 8th October 2018, 05:28 PM   #14
Lingwendil is online now Lingwendil  United States
Now with high-fructose ASSAULT-gluten!
diyAudio Member
 
Lingwendil's Avatar
 
Join Date: Apr 2008
Location: Oakley California
Aucharm UR330B8-11F full range 12" cabinet ideas?
Hmmm.

Might need to try something like that. I'm wondering what some good starting dimensions would be? 38x15, and maybe 10" deep?
__________________
Check out My 6SN7 Push-pull Flea Amplifier project! PCB COMING SOON!
  Reply With Quote
Old 8th October 2018, 08:15 PM   #15
freddi is offline freddi  United States
diyAudio Member
 
freddi's Avatar
 
Join Date: Aug 2005
Aucharm UR330B8-11F full range 12" cabinet ideas?
dunno - perhaps it could be a bit shorter in height but a bit wider - like 18" - -might have to provide a means to tilt it back more if the central HF lobe is needed for balance at your listening position. If you had some cheap particleboard or scrap then could make a test baffle - even doubled up cardboard might suffice for test wings to get an idea of the tone as the aperture width and starting gap is varied.

An aperture like below might work for starter

Click the image to open in full size.
  Reply With Quote
Old 10th October 2018, 05:05 PM   #16
RF2000 is offline RF2000  Wales
diyAudio Member
 
Join Date: Oct 2018
I know next to nothing about speaker building, but I have a decent knowledge of woodworking. With regard to the original post and teardrop shape, you wouldn't need an angular approximation, as the outside would almost be definitely constructed using a thin plywood, that will be flexible enough to bend, and stay in place with glue. Of course, given that the main concern is with the insulative properties of the cabinet, I see two feasible options, one of which I predict will appeal to you far more than the other. The first, and by far the most complex, is to use multiple layers of thin birch plywood and glue them up in a big made from MDF. The jig could be cut out by hand, or with a cnc cutter, and you would need two parts, a front and a back, with a gap in between for the plywood. As individual layers the plywood would be able to bend into place, and then the wood glue would create a rigid bond when dry, and would prevent the wood from springing back out of shape.
The second option, is to create an angular approximation first, using mdf, to act as the functional part of the speaker cabinet, and then get a single layer of thin plywood to bend around the outside. This would be simple enough to do, so long as there is a curved surface (I would assume the top and bottom panels) for the plywood to bend around. You would need to tack the plywood in place occasionally, to help keep it tight around the form, but these would be removed afterwards, and the small holes could be filled with some wood filler. The other option to keeping the plywood in place would be to cut an inverse mould to help clamp the cabinet in place against while it dries, but doing that, one might as well create both moulds, and do the first method mentioned.

*edit* (my phone died) You might also want to look at flexible plywood. This is similar to ordinary plywood, but the veneer grain all runs in the same direction to allow it to be flexible, but I am not sure how this affects the properties of the material when concerned about sound.
Hope this helps.

Last edited by RF2000; 10th October 2018 at 05:11 PM.
  Reply With Quote
Old 11th October 2018, 04:30 AM   #17
GM is offline GM  United States
diyAudio Member
 
GM's Avatar
 
Join Date: Jun 2003
Location: Chamblee, Ga.
You have to brace it really well.

GM
__________________
Loud is Beautiful if it's Clean! As always though, the usual disclaimers apply to this post's contents.
  Reply With Quote
Old 11th October 2018, 06:02 AM   #18
RF2000 is offline RF2000  Wales
diyAudio Member
 
Join Date: Oct 2018
True. Though, with the split moulds, you would definitely avoid a few problems. Interestingly, I was getting a little bored during the middle of my exams last summer, so I decided to make myself a shield, because, why not? It was made from three (or four, I forget) sheets of 3mm plywood, that were put in a large shield press contraption. This contained five arc shaped ribs, screwed in to large sheet of mdf from the underside, and a small lip, for the plywood to spot into. I put glue over the layers of plywood, and then put all the layers together in the one end of the shield press. I then used some ratchet straps, and pulled the wood slowly down onto the form. These might be a good way of pulling the two moulds together.
  Reply With Quote
Old 11th October 2018, 06:26 AM   #19
gadut is offline gadut  Indonesia
diyAudio Member
 
gadut's Avatar
 
Join Date: Dec 2008
Location: Jakarta, Indonesia
the simplest build for less experience wood worker is plain open baffle, you can add additional 12"/15" woofer. bass reflex will require Huge box

other than OB, it seems you must find professional cabinet maker for other more complicated box design
  Reply With Quote
Old 11th October 2018, 03:42 PM   #20
Lingwendil is online now Lingwendil  United States
Now with high-fructose ASSAULT-gluten!
diyAudio Member
 
Lingwendil's Avatar
 
Join Date: Apr 2008
Location: Oakley California
Aucharm UR330B8-11F full range 12" cabinet ideas?
Does anyone think something like this could be scaled to work well, or are we looking at a five foot tall, foot and a half, two foot deep cab?

She who must be obeyed isn't too negative surprisingly, so tall may work fine up to 48" or so... I was thinking the driver mounted around seated listening height and a 42~48" height would work, with maybe a 16" width, if there are any designs that may work that way. She doesn't like the wide and square looks, and really doesn't like the big OB types, although with some scrap finish moulding the canterbury type may work, she doesn't seem too hot on that idea because it looks too "squat" for her. Maybe 50-60" tall pensil types?


Hmmmm.




Also, I'm a reasonably skilled woodworking sort of guy, I just don't have the tools to do more advanced stuff at this time, other than the occasional project snuck in on the weekends at work.

Quote:
Originally Posted by RF2000 View Post
True. Though, with the split moulds, you would definitely avoid a few problems. Interestingly, I was getting a little bored during the middle of my exams last summer, so I decided to make myself a shield, because, why not? It was made from three (or four, I forget) sheets of 3mm plywood, that were put in a large shield press contraption. This contained five arc shaped ribs, screwed in to large sheet of mdf from the underside, and a small lip, for the plywood to spot into. I put glue over the layers of plywood, and then put all the layers together in the one end of the shield press. I then used some ratchet straps, and pulled the wood slowly down onto the form. These might be a good way of pulling the two moulds together.
I have a jigsaw, and could make support frames/gluing jigs to try the bendy-ply types of cabs I suppose. Back in high school I was pretty heavy into archery, and actually made a handful of fiberglass/wood laminate recurve bows, and it's a pretty similar technique to get them clamped and glued.
__________________
Check out My 6SN7 Push-pull Flea Amplifier project! PCB COMING SOON!
  Reply With Quote

Reply


Aucharm UR330B8-11F full range 12" cabinet ideas?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

Forum Jump

Similar Threads
Thread Thread Starter Forum Replies Last Post
What sealed cabinet VOLUME for 8" full range speaker? Eftegarie Full Range 59 10th March 2018 07:29 PM
Aucharm ideas perceval Full Range 5 29th June 2015 05:44 PM
Cigar box stereo full range Ideas and more Rick B Full Range 14 26th September 2013 08:01 PM
My first build, Ideas on a Horn/TL full range? malovich Full Range 6 27th November 2012 10:56 PM
Spherical Cabinet vs. ordinary Cuboid Cabinet for full range Speakers tiefbassuebertr Full Range 1 10th January 2012 04:49 PM


New To Site? Need Help?

All times are GMT. The time now is 08:30 PM.


Search Engine Optimisation provided by DragonByte SEO (Pro) - vBulletin Mods & Addons Copyright © 2018 DragonByte Technologies Ltd.
Resources saved on this page: MySQL 14.29%
vBulletin Optimisation provided by vB Optimise (Pro) - vBulletin Mods & Addons Copyright © 2018 DragonByte Technologies Ltd.
Copyright ©1999-2018 diyAudio
Wiki