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Old 06-15-2013, 04:40 PM   #1 (permalink)
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Default Cellular Phone Ampitheatre (need help boosting low-end)

Well as many of you probably know, most smart phones have their speaker on the back. In order to get the volume from your phone, the speaker is designed in a way that you're to lay it on a flat surface.

Now who wants to lay their phone flat and lean over it to watch a video? I damn sure don't. So I made an amphitheatre for it. It is actually a bit louder than just laying it flat on the desk and I took a while to refine the curvature of the shell for this.

Now it's louder than flat on the table and louder without the ringing of placing it in a regular bowl.

Basically I created a Styrofoam core that I covered in plaster and left it rough and before fully drying, I added a layer of Hydrocal over the top of that (paster with Portland cement), sanded smooth and then sealed with polycrylic.

One issue I do have though is that, while it works great, some of the sound fidelity is lost, particularly low-end frequencies. I think that the Styrofoam core is absorbing the lower ones so they're not reflecting off the plaster the way all the mids and highs do, but I'm not sure. I know a decent amount about sound engineering, but not nearly enough.

Is there any way I can regain some of that low end?

The Theatre:
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Last edited by anathematized_one; 06-16-2013 at 12:12 AM.
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Old 06-20-2013, 06:21 PM   #2 (permalink)
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That's a really interesting idea...I know a lot of people put their phones in bowls or large coffee cups to amplify the sound, but I like your idea too.
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Old 06-20-2013, 11:45 PM   #3 (permalink)
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Quote:
Originally Posted by drh1589 View Post
That's a really interesting idea...I know a lot of people put their phones in bowls or large coffee cups to amplify the sound, but I like your idea too.
The whole reason I did was primarily for video playback and crontroling the phone, impossible in a cup and really hard in a bowl. Most of the time, the bowl doesn't solve the viewing angle problem. either.

That and I had exra plaster and was bored. XD.

I might make a tutorial when I perfect the design.


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