Info on amplification of sound

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Info on amplification of sound

Postby donkeypunch » November 12th, 2014, 12:54pm

Helping my son with a project....they are building a non electric chamber to amplify sound (something you could put an Ipod or a phone on). I'm not doing any of the building of it, but working on the paper to go with it....can't find a good site that has a really good explanation of the properties involved.

Anyone have a link they can share, keep getting a bunch of sites for amps. Tried acoustic sites but none were of any help. Thanks.
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Re: Info on amplification of sound

Postby danimaltheman » November 29th, 2014, 2:24pm

I put my phone in a coffee mug. The mids get a bit too accentuated but the volume increases about double

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Re: Info on amplification of sound

Postby Fat Bastard » December 3rd, 2014, 2:39pm

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Re: Info on amplification of sound

Postby IndiProAudio » December 11th, 2014, 11:04pm

Just wiki : Acoustic Impedance, Horn Theory and Wavelength.
If you clip a horn onto your ipod speaker you are affectively creating a high acoustic impedance where the source meets the load or where the ipod speaker meets the horn throat. The acoustic impedance is created by the boundaries of the horn which impede the sound from emitting in all direction like it would in free space. The boundaries need to be sufficiently large to affect low frequency and be appropriately shaped as to not adversely affect higher frequencies. Where the mouth of the horn meets the open air an acoustic impedance match is created which means optimized power transfer.

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