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post #1 of 14 Old 05-27-2019, 03:27 PM - Thread Starter
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Styrofoam Speakers

There is a YouTube channel called Tech Ingredients that a friend sent me. On the channel, he did a lot of experiments using different materials, sizes and some Dayton exciters. I decided for fun, I'd try to make a line array of exciters using 1" styrofoam. The sheet is 2' by 6.4' with the exciters positioned using the 3/5th's rule. I only built one as of now as an experiment, so all audio is mono. I did some sweeps to see how they performed for some $100 line arrays. The measurements are from 1 meter and my room doesn't have any treatments.

Here is the exciter that I used: Dayton Exciter
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post #2 of 14 Old 05-27-2019, 04:22 PM - Thread Starter
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Some sweeps. The sub that I paired it with is an old DCM downward firing 10". I didn't spend that much time trying to set the distance, so it's a bit wonky around the XO, which I set at 150Hz.
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Last edited by JDontee; 05-27-2019 at 04:27 PM.
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post #3 of 14 Old 05-27-2019, 04:24 PM - Thread Starter
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post #4 of 14 Old 05-27-2019, 04:28 PM - Thread Starter
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Back of the panel.
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post #5 of 14 Old 05-28-2019, 01:44 PM
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Yeah that guy has some interesting videos. I've been contemplating trying these out with some drop ceiling tiles in my basement for invisible speakers.

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post #6 of 14 Old 05-28-2019, 03:14 PM - Thread Starter
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Quote:
Originally Posted by jevchance View Post
Yeah that guy has some interesting videos. I've been contemplating trying these out with some drop ceiling tiles in my basement for invisible speakers.
I think no matter what, they are going to need a subwoofer. I'm currently crossing them at 150Hz. Also, I'd be interested to know how well they perform in a ceiling tile. Right now, they sound the best while hanging from 2 eye hooks. The frame might keep the material from vibrating changing the frequency curve.


Also, these really need to be EQ'd in the higher frequencies (at least in my setup). So think about that before committing.
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post #7 of 14 Old 05-28-2019, 04:43 PM
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What If
"with some drop ceiling tiles"

the tiles /foam panels were laid on some foam weather stripping tape on the metal frame
as opposed to sitting right down on the metal frame

I saw these vids also and glad to see smeone who said what if.

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post #8 of 14 Old 05-28-2019, 05:55 PM - Thread Starter
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Quote:
Originally Posted by asarose247 View Post
What If
"with some drop ceiling tiles"

the tiles /foam panels were laid on some foam weather stripping tape on the metal frame
as opposed to sitting right down on the metal frame

I saw these vids also and glad to see smeone who said what if.
It's worth a try. If I get a chance, I'll do a sweep without any EQ of the panel hanging, and one with it propped on the floor. Just so you can see how contact points affect the frequency response.


If you could hang them from some wire or string without touching the frame, that might work as well.
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post #9 of 14 Old 05-28-2019, 05:56 PM - Thread Starter
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I'm thinking about cutting my current panels in half and making two panels for stereo listening. I'm wondering if they will still perform as a line array as they are now with 4 exciters.



Anyone have an idea if they will still perform as a line array?
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post #10 of 14 Old 05-28-2019, 06:01 PM
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I also have watched these vidoes. The most recent one that has me intrigued was where he tested the damping properties of MDF vs plywood and found plywood far exceeded MDF per weight
. I recommend watching through at least the 45 minute mark. I also am curious to try the Decidamp (https://www.pyroteknc.com/products/d...ecidamp-sp150/) in a build at some point as it seems like we could make our boxes considerably less resonant with this stuff.
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post #11 of 14 Old 05-30-2019, 05:57 PM
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Quote:
Originally Posted by JDontee View Post
I think no matter what, they are going to need a subwoofer. I'm currently crossing them at 150Hz. Also, I'd be interested to know how well they perform in a ceiling tile. Right now, they sound the best while hanging from 2 eye hooks. The frame might keep the material from vibrating changing the frequency curve.


Also, these really need to be EQ'd in the higher frequencies (at least in my setup). So think about that before committing.


Well considering I can put together the entire sound system for $50 it’d be a fun and cheap experiment.


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post #12 of 14 Old 05-31-2019, 08:34 AM - Thread Starter
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Quote:
Originally Posted by jevchance View Post
Well considering I can put together the entire sound system for $50 it’d be a fun and cheap experiment.


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If that's the case, I'd recommend 2 exciters per 2' by 4' ceiling panel. If you can't EQ the higher frequencies, you will probably not like the sound.
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post #13 of 14 Old 05-31-2019, 11:20 AM
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Quote:
Originally Posted by JDontee View Post
If that's the case, I'd recommend 2 exciters per 2' by 4' ceiling panel. If you can't EQ the higher frequencies, you will probably not like the sound.
Thanks for the tip, will make sure I get something that allows me to EQ. Wonder if there's a cheap amp board out there with DSP. Hrmmm...

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post #14 of 14 Old 06-02-2019, 01:50 PM
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yeah i watched him too
i got 2 exciters but havent used them ...

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