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Old 06-16-2013, 05:42 PM   #1 (permalink)
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Default Acoustically Boosting Bass?

I tried hard ti do research and all I can find are hass amps and tips for absorbing bass.

I want ti BOOST the low end acoustically. See my phone, I made an amphitheatre for it rather than using a bowl.

It works great, but the low end looses significant fidelity.

It is made with a styrofoam core covered in plaster ajd then covered in Hydrocal (plaster + Portland cement). Band shell shaped.

Is there any way I can modify it to increase the bass end.


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Old 06-16-2013, 06:42 PM   #2 (permalink)
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Quote:
Originally Posted by anathematized_one View Post
I tried hard ti do research and all I can find are hass amps and tips for absorbing bass.

I want ti BOOST the low end acoustically. See my phone, I made an amphitheatre for it rather than using a bowl.

It works great, but the low end looses significant fidelity.

It is made with a styrofoam core covered in plaster ajd then covered in Hydrocal (plaster + Portland cement). Band shell shaped.

Is there any way I can modify it to increase the bass end.


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You're using a phone. How low of a frequency do you think your phone's speakers are actually reproducing? Chances are, you're just dealing with lower mids acoustically, and not even the lowest ones. It's physically impossible for such small speakers to reproduce the low tones you may be looking for.

You might have better luck using a resonator, which would be a hollow box or object that will amplify the vibrations that are sympathetic to the lowest frequencies. For instance, if you picture a Kalimba, these have a resonator box built in so that the tines will create vibrations that reflect within the empty space confined by the shape and make of the box, just like an acoustic guitar.
Think about the design of ported subwoofer cabinets and go from there. While your phone's speakers will only be capable of reproducing frequencies in relation to its ability to travel back and forth at a particular frequency, which is directly proportional to the size of that speaker, you can still amplify what it is producing by allowing those waves to propagate through an environment that allows for waves to concentrate within a confined space for longer, versus just being shot off into the room and decaying before they have a chance to overlap.

Since you know that sound is simply vibration affecting air molecules at different rates of speed, and that hollow objects internally resonate vibrations sympathetically to its structure, you may be able to use that knowledge to do what you're trying to do.
However, you're dealing with SPL levels of a phone.
Honestly, I don't know why you just don't buy speakers for it.
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Old 06-16-2013, 09:35 PM   #3 (permalink)
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I don't just buy speakers because I haven't any money, (materials, especially art ones) I can get for free.

I know there won't be low bass but I do know the lower end (for my phone) is dying out in it. The amphitheatre is built, but I haven't got a way to test the fundamental frequency of any material I could use to make a resonator. I have no idea how to implement it, but I could figure that out easy.

I was wondering more or less other options like digging out the styrofoam core and inserting a different material that would work better.

Doea it really matter about buying speakers or not? This is a legitimate sound engineering exercise/experiment.

Also if I bought speakers, I would have to hold my phone and hold the speakers, which was half the point of my building the amphitheatre/band shell. Only one thing to hold with no need to cup my hand behind the speaker...


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