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Flat panel speakers DIY for $30 #2736351
05/14/18 11:36 AM
05/14/18 11:36 AM
Joined: Jan 2016
Posts: 1,122
Austria
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newer player Offline OP
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Joined: Jan 2016
Posts: 1,122
Austria
You can quickly make these $30 DIY flat panel speakers with a cardboard and a cheap transducer. They hang on the wall like paintings would:

https://youtu.be/zdkyGDqU7xA

They need a bit of help at lower fq, so you could hide some small speaker boxes or subs in the room.
___

This French guy went one step further and put two panels together in a thin box that looks to be about 5cm thick. The shape seems to combine those of a piano and a guitar. I think the front panel emphasizes higher frequencies and the back panel emphasizes lower frequencies. The box and various vents will boost bass and provide some level of tuning.

https://www.youtube.com/watch?v=wd_Loq6Rx0c

Last edited by casinitaly; 05/15/18 05:32 AM. Reason: fixed link
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Re: Flat panel speakers DIY for $30 [Re: newer player] #2736396
05/14/18 02:12 PM
05/14/18 02:12 PM
Joined: May 2013
Posts: 225
So Cal
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So Cal
I attached transducers from Clark Synthesis to the soundboard of an old upright, and set my Kawai MP11 in place of the old action. The transducers were expensive, but they have great bass response, and the upright was free.

Re: Flat panel speakers DIY for $30 [Re: newer player] #2736404
05/14/18 02:43 PM
05/14/18 02:43 PM
Joined: Jan 2016
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How did the piano sound with just transducers? Was frequency response relatively even? Did it sound like an acoustic piano?

Re: Flat panel speakers DIY for $30 [Re: newer player] #2736441
05/14/18 04:12 PM
05/14/18 04:12 PM
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Posts: 225
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It sounds bass heavy. Analysis with pink noise and an RTA shows it has pretty flat response up to about 1.5 Khz, and then it gently rolls off on the upper octaves. I plan to add a couple smaller transducers through crossover and separate amp to take care of the high end. But even with the high end deficiency it has now, it still sounds better than most speakers, simply because the surface area of the sound board is comparatively huge. It sounds much closer to the real thing.

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Re: Flat panel speakers DIY for $30 [Re: newer player] #2736506
05/14/18 07:05 PM
05/14/18 07:05 PM
Joined: Jan 2016
Posts: 1,122
Austria
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Nice. A cheap way to EQ would be to move the piano around the room, even just a little. Or shuffle the transducers around the soundboard

Rather than add more transducers, I might try using a simple EQ to reduce frequencies below say 1.5KHz. Then turn up the volume.

Come to think of it, I wonder how flat the frequency response of your upright was when it was new. Or how flat it should be. . .

Re: Flat panel speakers DIY for $30 [Re: newer player] #2736512
05/14/18 07:25 PM
05/14/18 07:25 PM
Joined: Jan 2015
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Groove On Offline
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I don't think newer player put in the right Youtube link ... the video is worth checking out if you want to try it yourself. Very informative.



We are the music makers,
And we are the dreamers of dreams.
Re: Flat panel speakers DIY for $30 [Re: Groove On] #2736514
05/14/18 07:33 PM
05/14/18 07:33 PM
Joined: Jan 2016
Posts: 1,122
Austria
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Pasted too fast! I asked the moderators to include the correct link which you included GrooveOn. Thanks for that. The video is pretty good.

Re: Flat panel speakers DIY for $30 [Re: newer player] #2736523
05/14/18 08:00 PM
05/14/18 08:00 PM
Joined: Sep 2009
Posts: 7,772
Raleigh, North Carolina
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MacMacMac  Offline
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Raleigh, North Carolina
What's all the excitement about?

Cheap 'ducers and some cardboard?
For only $30 ?
Just how good could they be?

Call me dubious.

Re: Flat panel speakers DIY for $30 [Re: newer player] #2736535
05/14/18 08:29 PM
05/14/18 08:29 PM
Joined: Jan 2015
Posts: 1,435
Groove On Offline
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I've been experimenting myself, that's why I knew the video! thumb It's very useful.

Materials:
It's cool that inexpensive end-grain balsa, extruded polystyrene and palette cardboard were excellent sound boards. I'd love to hear what the piano re-builders think about using End-Grain balsa vs. normal Edge-Grain wood. FYI - if you go to Home Depot, the extruded polystyrene is also listed under "Foamular".

Shape:
I still think a circular shape will give good acoustic performance but I haven't had the time to get my materials cut properly.

Pricing + Amplifier:
$30 is a bit misleading if you don't consider the amplifier. My setup was about US$150 which included a matching amplifier + 2x transducers and several different materials for sound boards:

- Dayton Audio 100 Watt 4 ohm Amplifier
- DAEX32EP-4 Thruster 32mm Exciter 40W 4 Ohm


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