Wifi Speaker with Raspberry Pi B+ and Harman / Kardon speaker

This is a custom build of an wifi speaker made out of the following materials:
* Harman Kardon HK S4 Speaker
* Raspberry Pi B+ with RuneAudio
* Adafruit Mono 2.5W Class D Audio Amplifier - PAM8302
* Optional: Custom board (Stereo to Mono)
* EDIMAX EW-7811UN Wireless USB Adapter

I solder everything directly to the Raspberry Pi B+ board, but if you want to reuse the board some time you could use adapters or an breakout board. But keep in mind that you don't have so mu