PX4 - 100 Watts RMS x 4 @ 4 Ohm 4 Channel AmplifierAccording to Merriam Websters Dictionary, primo is considered to be Of The Finest Quality. Living up to that standard we proudly present another entry in the Massive Audio PRIMO series of Class D Amplifiers, designed and engineered in the USA. This PRIMO PX4 is a multi channel Amplifier that easily delivers up to 150 Watts RMS to each of 4 Channels @ 2 and 300 Watts to 2 Channels @ 4. All PRIMO series amps use Mil Spec PCBs with Surface Mount Devices.