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Old 25th October 2004, 11:29 PM   #11
Sherman is offline Sherman  United States
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Quote:
Originally posted by johnnyx
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.

You are right. I've been looking at the "documentation" with the speakers and amp and it is NXT technology. I have a set of flat panel computer speakers (or I did before my son took them to college) based on NXT technology also. But I didn't expect it to work with plain old cardboard! I assumed the panels were specially designed and were more like ribbon speakers.

I went back to the store today thinking I'd pick up another set but they were gone. The guy there said they also had just the "exciters" that you could stick on anything like photographs or posters to turn that thing into a speaker. Of course they were out of those as well. He said they were $10. I'm going to keep looking for that.
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Old 26th October 2004, 12:32 AM   #12
DC Dave is offline DC Dave  United States
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I saw these from Sonic Impact on Target's website:

http://www.target.com/gp/detail.html...sin=B0001HKVKQ


I would be fun to see what they can really do.
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Old 26th October 2004, 02:33 PM   #13
Sherman is offline Sherman  United States
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Quote:
Originally posted by DC Dave
I saw these from Sonic Impact on Target's website:

http://www.target.com/gp/detail.html...sin=B0001HKVKQ


I would be fun to see what they can really do.
Dave,
Those are the do-hickeys (technical description) that they had in the store and the same things that are stuck on the cardboard speakers I have. I'm going to a client's office in a few minutes and will drive right by a Target store. I'm going to stop in and see if they have any left.

I did attempt to measure FR of the cardboard speakers this morning but couldn't. When playing a 1K Hz tone and setting the volume to 0 db on my meter I encountered a problem. At about minus 2 dB the speakers began emitting a second, completely different tone simultaneous with the 1K Hz signal.

I think it was harmonic resonance and it might be curable by just lifting the speakers a bit but I didn't have time to check it out. Maybe tonight or tomorrow.
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Old 26th October 2004, 03:06 PM   #14
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Quote:
I would be fun to see what they can really do.
Things like this for instance:


http://www.elac.com/en/index.html


Regards

Charles
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Old 26th October 2004, 05:29 PM   #15
johnnyx is offline johnnyx  United Kingdom
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When you buy a license from NXT, you get software to help you design flat response speakers. You will need some experimentation with material, shape and the position of the exciter. You may get some clues by googling.
I haven't seen anything like it in the UK, I wonder why not.
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Old 26th October 2004, 05:50 PM   #16
Sherman is offline Sherman  United States
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I stopped at another Target store today and found three more sets (amp, speakers, carrying case) on sale for $12.54!!! Half the price I paid a couple days ago. (BTW these Target stores are in the far west suburbs of Chicago.)

Of course I bought one. I'm planning to mod the amp, new case, RCA inputs, binding post outputs etc.

I also managed to get by American Science and Surplus and picked up two 12VDC 1A transformers for $3.95 each. I have the original amp and speakers playing right now on one of these transformers and it seems to be working fine so the power supply seems taken care of.

I'll probably take the exciters out of one set of speakers and try them on different materials.

Fun stuff for cheap.
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Old 27th October 2004, 12:55 AM   #17
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Hi Guys,

speaker cones are made of paper, so why not boxes?

more cardboard speakers at http://au.geocities.com/footstony

regards Philip
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Old 27th October 2004, 02:03 PM   #18
MEXXX is offline MEXXX  United States
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Wow Sherman, you found an awesome bargain. Even if you just bought the amps without the speakers it would still be a "too good to be true" find.

I plan on using two of these amps to Bi-amp my arrays, so off to Target I go. I doubt I'm gonna get as lucky as you did but its worth a try.
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Old 27th October 2004, 04:54 PM   #19
EC8010 is offline EC8010  United Kingdom
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For some information on bodging your own, have a look at:

Distributed mode loudspeakers (DMLs)
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Old 27th October 2004, 05:58 PM   #20
Evaas is offline Evaas  Canada
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Question amp?

What's the name of the amp?
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