The completely revised amplifiers of the QUANTUM Q compact class now offer as V3 version a higher power output and improved features. With a “footprint” of just 150 x 220 mm, the two power plants are completely designed as digital Class D power amplifiers. Their heavy die cast heatsinks contain state-of-the-art technology,, which sets new standards in terms of efficiency up to 90%. With the Auto Turn-On Function coupled to the high-level inputs, the two models are suitable for almost any installation, not only because of their size. Besides the conventional 12V version the Q-ONE and Q-FOUR are now available as 24V version and can be operated in trucks and coaches with a electrical system of 24 volts. Features Class D Technology with high Efficiency Constant Power Technology Heavy die-cast Heatsink High Level Inputs with Error Protection System (EPS®)   Auto Turn-On Function Start/Stop Ready Precious Acrylic Cover in Piano Finish Compact Bass Remote Controller Specifications Mono Class D Compact Digital Amplifier 1 x 300/500/700 Watts RMS @ 4/2/1 Ω Subsonic 10-50 Hz LPF 30-250 Hz Bass Boost 0-12 dB Phase Shift 0-180° Dimensions 150 x 50 x 220 mm Efficiency up to 84% Downloads Owner’s Manual Test Review