German Physiks PQS-302 loudspeakers with Emperor mono power amplifiers, driven by an Esoteric K-03XD SACD/CD player. The Emperor mono power amplifier can deliver 550W RMS into 8 ohms, 1,100W RMS into 4 ohms and 1,800W RMS into 2 ohms. These amplifiers, combined with the PQS-302s ability to produce a maximum output level of 112dB.