Features - Up to 85% efficiency thanks to ADC (Advanced D-Class) output stage USS (Universal Speakers Simulators) allows SP 4.900 to work with head units featuring the “speaker load detection” circuit 160 x 4 (4Ω) with ultra-compact size (211,6 x 130 mm) IP55 aluminum chassis for maximum protection against humidity and external agents No cooling fan to prevent internal accumulation of dirt Sealed power cord, line inputs, and speaker outputs to prevent oxidation Crossovers filters and controls on a single side to facilitate calibration when the product is installed General Specifications - Channels: 4 - 3 - 2 Nominal power supply voltage: 11 ÷ 15 VDC Pulse Operating voltage: 6 ÷ 16 VDC Idling current: 1.1 A Idling current when off: 0.03 mA Consumption @ 14.4 VDC, MIN load impedance (Max Musical Power): 50 A Remote IN: 6 ÷ 15 VDC (9 mA) DC-REM - Remote Turn on by SPK DC from OUTPUT BTL speakers: 3.5 ÷ 7 VDC Distortion - THD @ 1 kHz, 4Ω, 70% Rated Power: 0.02% Damping factor @ 1 kHz, 4Ω, 2 VRMS: 200 Bandwidth @ -3 dB: 10 Hz ÷35 kHz S/N ratio (A weighted @ 1 V Input): 105 dBA Pre-In sensitivity: 0.6 ÷ 6 VRMS Speaker-In sensitivity: 2.2 ÷ 22 VRMS Output Power - Output Nominal Power (RMS) @ 14.4 VDC, THD 1%: 4 Ch: 160 W x 4 (4Ω) 4 Ch: 250 W x 4 (2Ω) 3 Ch: 160 W x 2 (4Ω) + 500 W x 1 (4Ω) 3 Ch: 250 W x 2 (2Ω) + 500 W x 1 (4Ω) 2 Ch: 500 W x 2 (4Ω)