Quantity   Component name
1 × old radio
1 × Justboom Amp Kit A Raspberry Pi + Justboom Amp Hat + Power Supply
1 × Breakout Pi Plus (From ABElectronics.co.uk) a breakout board to connect 4 rotary encoders
1 × Speaker for car 30W RMS (165mm) NORAUTO SOUND XHE6521 4Ohm
4 × Rotary Encoder With Switch Button (Incremental Encoder) PEC11R-4015F-S0024
4 × Knob for the rotary encoder PKG100B1/4
1 × Wires