ST-UPDM4C-R | REFURBISHED: Lightweight & Compact 1U 4-Channel PA/DJ Class-D Power Amplifier, 4 X 1520W at 4-ohm

Refurbished Condition: 100% testing and function is in good condition while outside box worn out and small cosmetic dents. cosmetic damages will vary, including but not limited to, damaged or cracked, bent ears, scratches, dents, etc.

This professional-grade 1U rack amplifier combines massive power with exceptional efficiency through advanced UPDM technology. It delivers impressive performance with 4 x 800W at 8Ω (stereo), 4 x 1520W at 4Ω (stereo), or 2 x 2100W at 8Ω (bridged), making it ideal for powering PA systems, subwoofers, and live sound setups. The selectable input sensitivity (0.77V/1.0V/1.44V) ensures compatibility with various audio sources, while built-in protection circuits safeguard your equipment.

Designed for both touring and fixed installations, this amplifier offers versatile operation modes to suit different system requirements. Its rugged yet lightweight 1U chassis provides excellent portability without compromising durability, featuring efficient thermal management for reliable performance. With clean power delivery and space-saving design, this amplifier is a perfect solution for professional audio applications where both power and efficiency matter.

• ULTRA-EFFICIENT UPDM POWER: Leveraging Unipolar Pulse Density Modulation (UPDM) technology, this amplifier delivers massive power with ultra-low energy consumption.
• HIGH-OUTPUT PERFORMANCE: 4 x 800W RMS at 8-Ohm Stereo, 4 x 1520W RMS at 4-Ohm Stereo, 2 x 2100W RMS at 8-Ohm bridge.
• FLEXIBLE OPERATING MODES: Easily switch between Stereo, Parallel, and Bridge modes to perfectly match your system's power and channel requirements.
• PRECISE INPUT MATCHING: Selectable input sensitivity (0.77V / 1.0V / 1.44V) ensures optimal signal levels from source devices. Built-in overload safeguards protect your connected PA speakers and subwoofers for worry-free operation.
• TOUR-GRADE, LIGHTWEIGHT 1U: Packing immense power into a rugged, heavy-duty 1U rackmount metal chassis. Remarkably lightweight for effortless transport and setup.
  

Dimension & Weight

Warranty/Certifications

What do the front lights of my ST-UPDM4C represent?

• The blue light has to be on to ensure the related channel works without a problem. If you are obtaining a dim light, it should be a LED quality issue but won’t be a major problem. The lights should only have the status of 'on' or 'off'.
• Green LED should flash when the signal reaches -36dB.
• Red LED flash means clip (the signal is too big). Occasional flash is ok.
• When the signal is big, the light will be solid. When the signal is small, the light will flash.

What is the power consumption in amps at full power?

• 10 amps

▶ ST-UPDM4C User Manual (V5), purchased after 06.19.25
▶ ST-UPDM4C User Manual (V4), discontinued
▶ ST-UPDM4C User Manual (V3), discontinued
▶ ST-UPDM4C User Manual (V2), discontinued
▶ ST-UPDM4C User Manual (V1), discontinued
▶ ST-UPDM4C DIP Switch Instructions for V4
▶ ST-UPDM4C DIP Switch Instructions for V2 - English, purchased after 03.02.22
▶ ST-UPDM4C Linkout Connection Instructions for V1 - English, discontinued
▶ ST-UPDM4C Linkout Connection Instructions for V1 - Spanish, discontinued