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)