Cardboard Speakers! - diyAudio
Go Back   Home > Forums > Loudspeakers > Planars & Exotics

Planars & Exotics ESL's, planars, and alternative technologies

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 25th October 2004, 12:28 AM   #1
Sherman is offline Sherman  United States
diyAudio Member
 
Join Date: Feb 2004
Location: Chicago area
Exclamation Cardboard Speakers!

Yesterday I went to the local Target to try and find one of those $30 digital amps. What I found was a package that contained 2 "portable speakers" and the amp on sale for $24. I didn't care about the speakers but at the price I considered them freebies.

When I got home and opened the package I discovered the "speakers" were actually cardboard cones which were folded flat. They have some type of stick-on motor/transducer/whatever inside.

So I unfold them, they really are just cardboard, and set them up connected to the amp and feed in Ray Charles from the cd player.

I was stunned to say the least! They actually sounded like speakers! I expected them to sound "buzzy" with no high or low end. (Actually I hardly expected a sound from them.) Instead I heard extended lows, decent highs and a fine midrange and no buzzing!

I can't say they are "hifi" exactly. My DIY speakers have "crisper" high-end but these little guys have a deeper bass. I haven't done any FR measurements on them but I might try that next week.

I can say unequivocally that they are the absolute best sounding cardboard speakers I've ever heard!


P.S. That little amp sounds pretty good too!
__________________
--Sherman
  Reply With Quote
Old 25th October 2004, 01:27 AM   #2
diyAudio Member
 
jackinnj's Avatar
 
Join Date: Apr 2002
Location: Llanddewi Brefi, NJ
In 1974 when my wife (we were newly weds) and I moved into our first apartment in Brooklyn Heights I bought a pair of Radio Shack full range 8" speakers and fashioned a pair pseudo-horn cabinets out of cardboard -- the results were simply incredible -- I used a Pioneer SX838 which the successive generation of progeny have subsequently used in their college dorms (and now reclaimed by ME!)

After this I used a pair of AR3's, the Dalines (also great speakers), Swans, etc. Now for most of my listening I use biamped Kelidhs, and my favorite B139 reflex design.
  Reply With Quote
Old 25th October 2004, 06:27 PM   #3
Sherman is offline Sherman  United States
diyAudio Member
 
Join Date: Feb 2004
Location: Chicago area
I've fashioned a couple of cabinets from cardboard to try out things before building a real cabinet and sometimes those cardboard boxes can sound amazingly good. But the weird thing about these speakers is that there isn't any "driver" as such. Just that transducer or whatever stuck onto the inside of the cardboard. Imagine a three sided pyramid about 18" tall made of cardboard.

No openings for drivers, no drivers, nothing. Just cardboard.

In the next day or so I hope to be able to find the time to do some FR tests.
__________________
--Sherman
  Reply With Quote
Old 25th October 2004, 07:04 PM   #4
The one and only
 
Nelson Pass's Avatar
 
Join Date: Mar 2001
Well, look at this picture someone sent me
Attached Images
File Type: jpg js kleinhorn2.jpg (31.4 KB, 1550 views)
  Reply With Quote
Old 25th October 2004, 07:05 PM   #5
The one and only
 
Nelson Pass's Avatar
 
Join Date: Mar 2001
Here's another view:
Attached Images
File Type: jpg js kleinhorn.jpg (20.2 KB, 1343 views)
  Reply With Quote
Old 25th October 2004, 07:10 PM   #6
diyAudio Member
 
jackinnj's Avatar
 
Join Date: Apr 2002
Location: Llanddewi Brefi, NJ
Nelson: wasn't that the horn design used by John Belushi and Dan Ackroyd on the "Blues-Mobile" (a purloined Civil Defense siren) ?
  Reply With Quote
Old 25th October 2004, 08:21 PM   #7
Kittle is offline Kittle  United States
diyAudio Member
 
Join Date: Jun 2004
Location: KC
Done right cardboard enclosures can actually work...

I made one myself just to prove it could ( or could not) be done.

Its not suitable for subwoofer duty ... I got some interesting rattles below 30hz and near silence at 40hz. but above 60hz it works suprisingly quite well.

And with a decent driver, id even have a keeper. The only problem is it tends to be front-heavy and prone to falling over -- the driver weighs as much as the whole cabinet

Now that horn pic has got me pondering about making one of my own.....
  Reply With Quote
Old 25th October 2004, 08:25 PM   #8
diyAudio Member
 
jackinnj's Avatar
 
Join Date: Apr 2002
Location: Llanddewi Brefi, NJ
there was an article in Speaker Builder decades ago "The Folded and Stapled Horn" --
  Reply With Quote
Old 25th October 2004, 08:35 PM   #9
johnnyx is offline johnnyx  United Kingdom
diyAudio Member
 
Join Date: Jan 2004
Location: manchester
Hi sherman

I think those cardboard speakers used NXT technology, "chaotic bending waves" set up in a panel by the "exciter". I have some computer speakers made by TDK which use the same principle. Providing the material has the right stiffness/mass you can use the cheapest one you like. They chose cardboard.
  Reply With Quote
Old 25th October 2004, 11:23 PM   #10
Sherman is offline Sherman  United States
diyAudio Member
 
Join Date: Feb 2004
Location: Chicago area
Quote:
Originally posted by Nelson Pass
Well, look at this picture someone sent me

Pretty cool cardboard horn! But, I'm guessing that it still has "regular" drivers.

That's the thing that is amazing (at least to me) about these speakers. No "regular" driver. Recognizing that speakers like Magneplanars etc. also don't have what I normally think of as a regular driver this is something different from that.

Still, that photo tempts me to start cutting up some boxes!
__________________
--Sherman
  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
Free Cardboard tubes gengis Everything Else 4 5th August 2005 12:29 AM
cardboard can be cool Deagle50ae Multi-Way 14 7th March 2005 06:43 PM
Open baffle - from cardboard to... miguel2 Multi-Way 1 27th July 2004 04:55 PM
chocolate box cardboard coil formers :) Duo Multi-Way 4 4th January 2004 07:05 PM


New To Site? Need Help?

All times are GMT. The time now is 12:17 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