Foam Core Board Speaker Enclosures? - Page 225 - diyAudio
Go Back   Home > Forums > Loudspeakers > Full Range

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 2nd March 2014, 05:04 PM   #2241
Turbon is offline Turbon  Sweden
diyAudio Member
 
Turbon's Avatar
 
Join Date: Aug 2011
Location: South
Quote:
Originally Posted by camelator View Post
Again thank you very much,
I am going to 24' large x 3' deep
First step was to convert the pdf file posted by planet to a .jpg
then I convert it to a pdf poster with posterazor
scale factor=24'x2.54/74=82.64% (around)

I have the pdf for interested peole
Yes, please share

Regards
__________________
These are my principles, and if you don't like them... well, I have others.
  Reply With Quote
Old 2nd March 2014, 05:15 PM   #2242
diyAudio Member
 
Join Date: Feb 2013
Thanks for the details,

Here is the poster in pdf.
It is ready for A4 print (just done it). There are 1.5cm margin and 1cm overlapping.
just printed, glued, it is a 61cm square.
Attached Files
File Type: pdf cornu_clone_spiral_crop_poster60.pdf (177.8 KB, 51 views)
  Reply With Quote
Old 2nd March 2014, 05:20 PM   #2243
Turbon is offline Turbon  Sweden
diyAudio Member
 
Turbon's Avatar
 
Join Date: Aug 2011
Location: South
Quote:
Originally Posted by camelator View Post
Thanks for the details,

Here is the poster in pdf.
It is ready for A4 print (just done it). There are 1.5cm margin and 1cm overlapping.
just printed, glued, it is a 61cm square.
Thank you camelator!

Regards
__________________
These are my principles, and if you don't like them... well, I have others.
  Reply With Quote
Old 2nd March 2014, 05:32 PM   #2244
diyAudio Member
 
Join Date: Feb 2013
xrk971: I saw you have a kind of foam collection which one do you prefer and why?
  Reply With Quote
Old 2nd March 2014, 08:43 PM   #2245
xrk971 is offline xrk971  United States
diyAudio Member
 
xrk971's Avatar
 
Join Date: Oct 2012
Location: Virginia
Quote:
Originally Posted by camelator View Post
xrk971: I saw you have a kind of foam collection which one do you prefer and why?
How does one pick a favorite child?

Depends on what you want them to do. They all have their place.

All around best is the mini Karlsonator.
Best hifi sound is Nautaloss with sub in a FAST.
Best simple to make for background music is flat wall MLTL.
Most cool is Cornu.
  Reply With Quote
Old 2nd March 2014, 09:33 PM   #2246
xrk971 is offline xrk971  United States
diyAudio Member
 
xrk971's Avatar
 
Join Date: Oct 2012
Location: Virginia
Quote:
Originally Posted by xrk971 View Post
How does one pick a favorite child?

Depends on what you want them to do. They all have their place.

All around best is the mini Karlsonator.
Best hifi sound is Nautaloss with sub in a FAST.
Best simple to make for background music is flat wall MLTL.
Most cool is Cornu.
I forgot to mention the speaker I listen to the most is the one mounted in the bedroom on the wall: the flat BIB or FIB. It has enough bass, great overall balance and just about anything sounds good on it at moderate levels.
  Reply With Quote
Old 2nd March 2014, 11:12 PM   #2247
diyAudio Member
 
Join Date: Feb 2013
xrk971, thx a lot for these details.
I am going to build my first cornu and compare with my DIY 2 ways speakers.
Sorry for my bad english, I have few questions (again) 3' is for the overall deep?
Have you cut the piece of throat ? Or is it 1 piece for each side?
  Reply With Quote
Old 3rd March 2014, 12:59 AM   #2248
xrk971 is offline xrk971  United States
diyAudio Member
 
xrk971's Avatar
 
Join Date: Oct 2012
Location: Virginia
The throat is formed naturally by the two pieces which spiral outwards. You do not actually cut the throat opening. 3 inches is the axial spacing between the front and back panel. I would make it 2.5 inches as my simulation showed that was the best to balance the bass with the highs.
You might want to post questions in the Cornu thread - others may be able to answer there and your questions will help others trying to build it too.
Ever think of building a Cornu Spiral horn? Now you can!
Good luck.
X

Last edited by xrk971; 3rd March 2014 at 01:04 AM.
  Reply With Quote
Old 3rd March 2014, 03:27 AM   #2249
xrk971 is offline xrk971  United States
diyAudio Member
 
xrk971's Avatar
 
Join Date: Oct 2012
Location: Virginia
Default The Simplest FC OB Speaker Ever

If you are lazy and want to make the easiest FC speaker ever and you have always wondered what an open baffle (OB) speaker sounds like you might want to try this...

Get qnty 4 of these exciters from PE for $3.50 ea x 4 = $14: HiWave 25mm SoundPax Exciter Turns Virtually Anything Into A | 309-149

Get 2 sheets of FC ($2)

Glue the exciters to the back of the FC panel (2 each, slightly off center so you are not on the fundamental drumhead vibrational mode.

Hook them up in parallel for a 4 ohm load and connect to a nice class D amp like the TPA3116D2 and you are in for some OB cheap thrills!

You have a 20 x 30 in OB that actually reaches 50 Hz and sounds kind of nice. It lacks the airiness of a top end and can use a piezo tweeter but over the range that it works it is amazingly even. Don't let the cheap price and small size fool you - it can put out some decent SPL. For best results hang by string suspended in mid air for a really nice OB sound that can fill the room.

Here are some measurements of the frequency response (near field at 12 in away) with impedance as seen by amp (pretty flat near 4 to 6 ohms), harmonic distortion, and impulse response.

Don't mind the little blocks of gray foam - I was going to wall mount them but they sound so much better away from a wall as an OB. The little FC frame around the edges is optional - I made it for wall mounting but that can be omitted too.

Have fun with it.
Attached Images
File Type: png FC-Exciter-OB-1.PNG (468.2 KB, 752 views)
File Type: png FC-Exciter-OB-2.PNG (414.8 KB, 415 views)
File Type: jpg fc-dual-exciter-spl-impedance.jpg (146.5 KB, 391 views)
File Type: jpg fc-dual-exciter-hd.jpg (198.7 KB, 698 views)
File Type: jpg fc-dual-exciter-impulse.jpg (98.7 KB, 342 views)

Last edited by xrk971; 3rd March 2014 at 03:34 AM.
  Reply With Quote
Old 3rd March 2014, 10:09 AM   #2250
diyAudio Member
 
Join Date: Feb 2013
Well,
Thank you xrk971, it is interesting...
Basically, I am not looking for the simplest speaker
I don't know full range driver and I would like to have a 'cheap' test .
I like jazz with good bass.

My second motivation is for my wife, she is Yoga teacher and would like a good but simple portable audio system, with a nice design.

I would like to build it by myself, I ordered a 3116 amp, and thinking on speakers...

I had a look on your Tear Drop foam speakers. I really like the design (good job). It may be a good option, but it is too big. I need something small, let say 8' long.... So I need to think a little bit about that.
  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
Speaker damping: Foam or expanding foam akunec Multi-Way 4 11th February 2014 02:14 AM
Replace speaker foam with this odd material? flyingsquirrelman Subwoofers 7 25th July 2010 02:32 PM
concrete board for enclosures? alandarkdale Multi-Way 6 31st March 2007 09:35 AM
Foam core construction for subwoofers morbo Subwoofers 19 30th August 2005 09:09 PM
speaker foam dave k Multi-Way 2 24th June 2003 06:05 AM


New To Site? Need Help?

All times are GMT. The time now is 01:10 AM.


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