iPhone Passive Amplifier (like the Koostik)

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Project by Paul posted 12-22-2013 02:23 PM 3940 views 10 times favorited 4 comments Add to Favorites Watch
iPhone Passive Amplifier (like the Koostik)
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I’ve seen a few designs of this now, and was very curious about building one. So, I grabbed some scrap walnut and made one. It changes the tone of the music slightly, but importantly, it amplifes the sound a little bit and projects outward. My son loves it and has used it non stop since I built it. A pretty fun little project anyway.

Here’s the website with some plans:

Fun, easy, and quick results.


-- Paul, Iowa

4 comments so far

View ddmac's profile


7 posts in 1127 days

#1 posted 12-23-2013 02:49 PM

I’m working on making this now too. How thick were the different layers? All 3/4” ?

View Paul's profile


44 posts in 1703 days

#2 posted 12-24-2013 02:41 PM

Yes, ddmac. They were all 3/4 pieces.

-- Paul, Iowa

View Fishinbo's profile


11362 posts in 1593 days

#3 posted 12-26-2013 03:03 PM

Cool project! The walnut is gorgeous. Great job!

View geezerglide's profile


10 posts in 1265 days

#4 posted 02-15-2014 06:32 PM

I saw the plans online and thought they were great, I plan on making one for my iPhone, I have a couple other projects I need to get done first, like a cabinet for the wife’s new laundry sink and my cigar box resonator geetar that I started. As Red Green wood say: if the women don’t find ya handsome, they should at least find ya handy…


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