I am glad you guys are having fun in this thread. I think it's neat when the drivers are so cheap and there are so many different ways to do it. I was thinking foam core with foam core ribs. Pva coating seems to be de rigeur.
I need to get another large sheet of FC to try a large panel.
I need to get another large sheet of FC to try a large panel.
I have a bunch of piezos laying around here (DIY e-drums kit) so I hooked one up to my TPA3116 just for fun, and stuck it on a bamboo tissue box (to act like a resonant chamber).
It works, but not exactly hifi, and not much bass, of course.
Still, I can see this could be fun!
An externally hosted image should be here but it was not working when we last tested it.
It works, but not exactly hifi, and not much bass, of course.
Still, I can see this could be fun!
I used some of those little ElCheepo 16 ohm exciters from PE and built me a Taco Bell Boombox. Gotta luv playin'..
Pic album if ya wanna see..
https://imageshack.com/a/XD0q
Pic album if ya wanna see..
https://imageshack.com/a/XD0q
I've upgraded it a little since those pics were taken. I lined the ends/backside/bottom with cardboard, divided the two halves with a double layer of cardboard, and sealed the top of the entire cavity with a piece of cardboard. Made the thing stronger and easier to handle. The center divider gave the channels (L/R) more separation..
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CLS: Gorilla Glue is a polyurethane glue (PU), so when it expands and dries it is just polyurethane 🙂 It is quite firm, pretty dead acoustically. I would say woodlike, or certainly like foam core.
XRK971: I know it is your material, but other threads say that FC is not the best. While there is no consensus (eg. some say glass is great, others say "no"), it seems that thin, rigid, light is best. There are trade-offs of course. No doubt carbon fiber would be best, can anyone afford a 4x8' sheet 🙂 I vote for expanded polystrenge (XPS?) -- available in big sheets, very cheap. Some have foil facing (I have wondered if anyone could use it to make a ready-made planar magnet or electrostatic panel?) and coroplast can be free (unless you get arrested
)
I give the "speaker cone full of Gorilla Glue" an "F" for results: too much attenuation. For my two remaining drivers I am going to try the cat food tin, a variation on what might be best (xrk's suggestion to use a puck). I don't play hockey, so puck it!
XRK971: I know it is your material, but other threads say that FC is not the best. While there is no consensus (eg. some say glass is great, others say "no"), it seems that thin, rigid, light is best. There are trade-offs of course. No doubt carbon fiber would be best, can anyone afford a 4x8' sheet 🙂 I vote for expanded polystrenge (XPS?) -- available in big sheets, very cheap. Some have foil facing (I have wondered if anyone could use it to make a ready-made planar magnet or electrostatic panel?) and coroplast can be free (unless you get arrested
)I give the "speaker cone full of Gorilla Glue" an "F" for results: too much attenuation. For my two remaining drivers I am going to try the cat food tin, a variation on what might be best (xrk's suggestion to use a puck). I don't play hockey, so puck it!
About your fully gorilla glued driver, how about carving holes, in a pattern, to lighten the whole thing and probably make it more responsive?
You could be creative and come up with a flower pattern or something.
Maybe something looking like this?
You could be creative and come up with a flower pattern or something.
Maybe something looking like this?
Here's a commercial product that popped up on Ebay ads, of all places.
NOVASONAR |
Nice web site, with enough detail that reverse engineering may be possible
It is German, which means stereotypically "very high quality" and prices to match 🙁
NOVASONAR |
Nice web site, with enough detail that reverse engineering may be possible
It is German, which means stereotypically "very high quality" and prices to match 🙁
The Bose drivers, as wall speakers. Stick is frame but could use for campaign sign motif [emoji12]
Mexican method (#66) ... Is he connecting cone to speaker rear? I am unclear. Why not just have stick poke our membrane? Hombre, expliìqueme cómo funciona su dispositivo. por favor.
Es para seguir utilizando el sonido emitido por la bocina en si, pero reforzar los bajos con una membrana mas grande al fondo de un baffle abierto (un marco de 3 pulgadas de fondo). En si, un tambor en toda la parte posterior del gabinete.
Help me translate, here is my try.😛
I still using the sound of the small driver, but, transmiting the low freq. to the back panel (the drum) it is a sheet of polipropylene foam (6x4x1) mounted on a frame 3 inches deep..Prototype disassembled to build another one, my goal is to invent the smaller bluetooth speaker with real deep bass. I think I already did it🙄. maybe to patent😕. I want to buy the Bose Soundlink mini to compare but is expensive for me.🙁
Help me translate, here is my try.😛
I still using the sound of the small driver, but, transmiting the low freq. to the back panel (the drum) it is a sheet of polipropylene foam (6x4x1) mounted on a frame 3 inches deep..Prototype disassembled to build another one, my goal is to invent the smaller bluetooth speaker with real deep bass. I think I already did it🙄. maybe to patent😕. I want to buy the Bose Soundlink mini to compare but is expensive for me.🙁
A Lo-Q System - The Ultimate Flat Loudspeaker
Then in 1988 the friendship between Dr. Bertagni and Placido Domingo forced the company to do the first big sound reinforcement job in Tehotihuacan, Mexico. This concert featured Placido Domingo, with three other soloists, a choir and symphonic orchestra for an audience of about 4,000 people.....
Found: proAV / data and information, lists, tables and links
Un inventor de Argentina !!!
Then in 1988 the friendship between Dr. Bertagni and Placido Domingo forced the company to do the first big sound reinforcement job in Tehotihuacan, Mexico. This concert featured Placido Domingo, with three other soloists, a choir and symphonic orchestra for an audience of about 4,000 people.....
Found: proAV / data and information, lists, tables and links
Un inventor de Argentina !!!
mexian,
Nice find!
Yes, the DML panel is ideal for screen. You may find some examples on the web. 🙂
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Among all DML experiments, I believe fun is a factor you'd never miss. Other than that, I hope you guys also notice the unique characters of sound quality.
Bending wave, bi-pole/quasi-omni, and effortless big area radiation provide a very special listening experience, including hugely spacious presentation, superb transient response and micro-dynamics. These keep me going.
Nice find!
Yes, the DML panel is ideal for screen. You may find some examples on the web. 🙂
------
Among all DML experiments, I believe fun is a factor you'd never miss. Other than that, I hope you guys also notice the unique characters of sound quality.
Bending wave, bi-pole/quasi-omni, and effortless big area radiation provide a very special listening experience, including hugely spacious presentation, superb transient response and micro-dynamics. These keep me going.
Honeycomb board should be excellent.
Similar material is used by commercial products of Podium. It's mentioned in earlier post.
There's also Coosa
Nautical Panels - Coosa Composites
I've worked with both on boats and either might make for a nice panel substrate.
Regretfully I haven't done anything with flat panel experiments.....but I'm facinated with the possibilities.
Nautical Panels - Coosa Composites
I've worked with both on boats and either might make for a nice panel substrate.
Regretfully I haven't done anything with flat panel experiments.....but I'm facinated with the possibilities.
They made surfboards with honeycombed cardboard.
Since cardboard seems nice for exciters, honeycombed should be even better, right?
Need to find where to buy honeycombed cardboard... Or make my own?
Since cardboard seems nice for exciters, honeycombed should be even better, right?
Need to find where to buy honeycombed cardboard... Or make my own?
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But is not wide enough, so it can't be a whole continuous area when you need more than 60cm. (it's default 60x90cm)
And I guess it's also difficult to make a uniform press for large flat area.
This core-only material is ideal for making curvy surface, though. But the tool for pressing is even harder to make...
The ready-made paper honeycombs are mostly too thick. Probably good for bass, but I'm not sure for M-HF.
But is not wide enough, so it can't be a whole continuous area when you need more than 60cm. (it's default 60x90cm)
And I guess it's also difficult to make a uniform press for large flat area.
This core-only material is ideal for making curvy surface, though. But the tool for pressing is even harder to make...
The ready-made paper honeycombs are mostly too thick. Probably good for bass, but I'm not sure for M-HF.
Could be done DIY like in here:
Also, this guy has "laser cut" honeycombed metal panel... I didn't ask if it's possible to get in bigger size, since it is a bit expensive for the size.
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Also, this guy has "laser cut" honeycombed metal panel... I didn't ask if it's possible to get in bigger size, since it is a bit expensive for the size.
ÅS¤Ñ©ç½æ-¥xÆW NO.1 ©ç½æºô¯¸