ESX SXT900.4 (24V)

With the SIGNUM SXT power amplifiers, ESX opens a new chapter in mobile amplifier technology. Designed specifically for trucks with 24V electrical systems, these German-engineered amplifiers offer outstanding sound, massive power, and maximum reliability – exactly what you need for everyday use on the road. The one-piece die-cast aluminum heat sinks ensure optimal heat dissipation and provide a sophisticated look. Combined with modern Class D technology, the ESX amps are compact, highly efficient, and incredibly powerful. Perfect for anyone who demands top-notch sound, even in a truck.   The new SXT900.4 impresses with maximum flexibility in the truck: With up to 4 x 225 watts RMS, it powerfully and reliably supplies front and rear systems. In 3-channel mixed operation, it delivers 2 x 225 watts RMS plus, bridged, 1 x 450 watts RMS for a subwoofer. The included bass remote control allows for convenient level adjustment from the driver’s seat. Variable high-pass and low-pass filters from 50 to 5000 Hz offer maximum tuning freedom. In the Car&Hifi test (1/2026), the ESX amplifier impressively demonstrated its class: With an output of 4 x 257 watts, very low distortion, and a 98 dB signal-to-noise ratio, it significantly exceeded ESX’s factory specifications. Editorial rating: Top class, price/performance ratio – excellent. Features Efficient Class D Technology with compact Dimensions Die-cast Aluminum Heatsink with optimal Cooling Properties RCA Inputs, RCA Outputs Compact Bass Remote Controller   High Level Inputs with Error Protection System (EPS®) Auto Turn-On Function Start/Stop Ready Specifications 4-Channel Class D Digital Amplifier 4 x 125/225 Watt RMS @ 4/2 Ω 2 x 450 Watts RMS @ 4 Ω bridged HPF/LPF 50 – 5000 Hz (FRONT) HPF/LPF 50 – 5000 Hz (REAR) Bass Boost 0 – 12 dB (REAR) Input Selector 2CH/4CH Dimensions 140 x 44 x 225 mm Efficiency up to 90%