- raspberry model A+ - Class D Audio Amp (breakout board based on MAX98306): http://www.exp-tech.de/Shields/Audio/Stereo-3-7W-Class-D-Audio-Amplifier-MAX98306.html - 2 x loudspeaker 3" 4 Ohms 3Watt: http://www.exp-tech.de/Zubehoer/Sonstige-101/Lautsprecher-3-Durchmesser-4-Ohm-3-Watt.html - PLA