After building a little battery powered cube boombox for a friend, here's a more powerful version that I built for myself. it's based on the Yamaha YDA148 (aka Y148) class D amplifier chip [1][2] which delivers 2 x 20W into 4Ohm at 12V.
power is supplied by three 18650 LithiumIon cells in series, which are charged by a cheap balancing charger[3] - this one is in fact not really a balancer but merely three 4.2V chargers in series.
the speaker is a Visaton FR10/4Ohm [4] and is rated for 30W, so this little box can get quite loud if needed. There is a jack to connect a second speaker if needed for a stereo pair.
the audio input is a standard 3.5mm jack and of course the box comes with a complementary set of teal and orange connection cables
the box itself is made from leftovers of 18mm pine, dyed and sealed with acrylic
[1] http://www.yamaha.co.jp/english/product/lsi/amplifier/
[2] http://www.dx.com/p/y148-audio-amplifier-module-93121#.VMvoWXV9qRs
[3] http://www.aliexpress.com/item/IMAX-B3-Pro-2-3-cells-LiPo-Battery-Balance-Charger-free-shipping/682551063.html
[4] http://www.visaton.com/en/industrie/breitband/fr10_4.html
https://plus.google.com/u/0/+VladimirPantelic/posts/GAYeaYthRm5
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