2017 was our 20th year online!

Welcome to the Piano World Piano Forums
Over 3 million posts about pianos, digital pianos, and all types of keyboard instruments
Join the World's Largest Community of Piano Lovers (it's free)
It's Fun to Play the Piano ... Please Pass It On!

Shop our online store for music lovers
SEARCH
Piano Forums & Piano World
(ad)
Wessell Nickel & Gross
PianoForAll
(ad)
Best of Piano Buyer
 Best of Piano Buyer
(ad)
Faust Harrison Pianos
Faust Harrison 100+ Steinway pianos
Who's Online Now
38 members (chopinetto, crooow, anotherscott, Beowulf, clothearednincompo, Colin Miles, Damyan, 13 invisible), 479 guests, and 481 robots.
Key: Admin, Global Mod, Mod
(ad)
Estonia Pianos
Estonia Pianos
Previous Thread
Next Thread
Print Thread
Hop To
Flat panel speakers DIY for $30
#2736351 05/14/18 10:36 AM
Joined: Jan 2016
Posts: 2,601
2000 Post Club Member
OP Offline
2000 Post Club Member
Joined: Jan 2016
Posts: 2,601
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 04:32 AM. Reason: fixed link
(ad)
Sweetwater Gifts That Rock
Re: Flat panel speakers DIY for $30
newer player #2736396 05/14/18 01:12 PM
Joined: May 2013
Posts: 241
O
Full Member
Offline
Full Member
O
Joined: May 2013
Posts: 241
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
newer player #2736404 05/14/18 01:43 PM
Joined: Jan 2016
Posts: 2,601
2000 Post Club Member
OP Offline
2000 Post Club Member
Joined: Jan 2016
Posts: 2,601
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
newer player #2736441 05/14/18 03:12 PM
Joined: May 2013
Posts: 241
O
Full Member
Offline
Full Member
O
Joined: May 2013
Posts: 241
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.

Re: Flat panel speakers DIY for $30
newer player #2736506 05/14/18 06:05 PM
Joined: Jan 2016
Posts: 2,601
2000 Post Club Member
OP Offline
2000 Post Club Member
Joined: Jan 2016
Posts: 2,601
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
newer player #2736512 05/14/18 06:25 PM
Joined: Jan 2015
Posts: 1,817
1000 Post Club Member
Offline
1000 Post Club Member
Joined: Jan 2015
Posts: 1,817
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
Groove On #2736514 05/14/18 06:33 PM
Joined: Jan 2016
Posts: 2,601
2000 Post Club Member
OP Offline
2000 Post Club Member
Joined: Jan 2016
Posts: 2,601
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
newer player #2736523 05/14/18 07:00 PM
Joined: Sep 2009
Posts: 12,670
Yikes! 10000 Post Club Member
Offline
Yikes! 10000 Post Club Member
Joined: Sep 2009
Posts: 12,670
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
newer player #2736535 05/14/18 07:29 PM
Joined: Jan 2015
Posts: 1,817
1000 Post Club Member
Offline
1000 Post Club Member
Joined: Jan 2015
Posts: 1,817
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


We are the music makers,
And we are the dreamers of dreams.

Moderated by  Piano World 

Link Copied to Clipboard
(ad)
Pianoteq
Steinway Spiro Layering
(ad)
PianoDisc

PianoDisc
(ad)
Piano Life Saver - Dampp Chaser
Dampp Chaser Piano Life Saver
(ad)
Mason & Hamlin Pianos
(ad) SWEETWATER Cyber Sale
New Topics - Multiple Forums
Roland LX706 Review
by Colin Miles - 12/04/20 06:41 AM
Best Headphones for Digital Piano - your experience
by lukasz-zsakul - 12/04/20 05:10 AM
Is the Hailun 218 solid spruce?
by Sonepica - 12/04/20 04:55 AM
Schiff talked about Bartók's style of playing
by symphonicdance - 12/04/20 01:46 AM
Download Sheet Music
Virtual Sheet Music - Classical Sheet Music Downloads
Forum Statistics
Forums41
Topics203,254
Posts3,030,353
Members99,467
Most Online15,252
Mar 21st, 2010
Please Support Our Advertisers


Faust Harrison 100+ Steinways

Dampp Chaser Piano Life Saver

 Best of Piano Buyer

PianoTeq Bechstein
Visit our online store for gifts for music lovers

Virtual Sheet Music - Classical Sheet Music Downloads



 
Help keep the forums up and running with a donation, any amount is appreciated!
Or by becoming a Subscribing member! Thank-you.
Donate   Subscribe
 
Our Piano Related Classified Ads
| Dealers | Tuners | Lessons | Movers | Restorations | Pianos For Sale | Sell Your Piano |

Advertise on Piano World
| Subscribe | Piano World | PianoSupplies.com | Advertise on Piano World |
| |Contact | Privacy | Legal | About Us | Site Map | Free Newsletter |


copyright 1997 - 2020 Piano World ® all rights reserved
No part of this site may be reproduced without prior written permission
Powered by UBB.threads™ PHP Forum Software 7.7.4