This is not a new idea, just my version of a diy on this passive acoustic speaker (PAS) for Kindle Fire or other mobile device with built in speakers.  I was so stoked to get on this project that I did not take real-time step-by-step pictures of the process.  Rather, I will  show pictures of the finished PAS as I describe the construction process.

My goal was to have an attractive, portable, and functional form of acoustic amplification for my Kindle Fire.  The result was a decorative piece that fits in with our design and offered a more detailed and dynamic sound for our listening pleasure.  Enjoy!

Step 1:

The first step was to select a piece of walnut wood with the dimensions of 5 1/4 " x 5 1/4 " x 1 3/4" thick.  I chose walnut because of it's density and reflective qualities when it comes to sound reproduction.  I also like the look of the grain and figure. 
RangerJ, if I were to do it again I would probably rout the bottom to a deeper depth. I think it might increase the bass response. Also a thicker block of wood might be fun to work with in channeling the sound through multiple ports.
That's a very nice Instructable. I have a Nook; I think I can use the same idea on that to much improve the very weak audio.

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