Since "MOSFET 50W x4" is a very common label found on hundreds of different Pioneer models (from the 1990s through the 2010s), you will get better responses if you can find the specific model number . It is usually printed on the front panel (e.g., DEH-P6000UB , DEH-150MP , KEH-P2030 ). Adding that specific model number helps buyers know exactly what features (Bluetooth, Aux, CD, USB) the unit has.
Pioneer’s use of MOSFET circuitry provides several advantages over standard factory-installed stereos: Pioneer Mosfet 50wx4 Aux pioneer mosfet 50w x4