Sundown Audio SDX-100.4 4-Channel Class D Amplifier, 135W x 4 RMS, Weatherproof

Features

• Weatherproof Open-Air Design: The SDX-100.4 Class D amplifier suits car, UTV, powersports, and open-air vehicle audio systems, with a water-resistant build for changing conditions
• 4-Channel RMS Power: Delivers 135 x 4 at 2 ohms RMS, 100 x 4 at 4 ohms RMS, and 270 x 2 at 4 ohms bridged, giving flexible output for speakers or bridged installs
• Precise Audio Tuning: Variable 12dB high-pass filters cover 15Hz to 500Hz or 300Hz to 10kHz on channels 1-2, while channels 3-4 add low-pass control from 30Hz to 500Hz or 600Hz to 10kHz and bass boost at 50Hz
• Protected Control Layout: A removable audio control cover keeps settings covered, with DC auto-sensing turn on, optional wired remote, and thermal, voltage, speaker short, and DC-offset protection for system care
• Compact Aluminum Housing: Heavy cast aluminum heat sink supports heat control in tight spaces, while 11.5V to 15V operation, 50A fuse, >78dB S/N ratio, and 8.875 x 7 x 2.125 in size fit many builds

Description

The Sundown Audio SDX-100.4 is a compact 4-channel weatherproof Class D amplifier made for car, UTV, powersports, and open-air vehicle audio systems. Its water-resistant design helps keep the amp ready for changing conditions while giving your setup clean multi-channel power. This amplifier delivers flexible RMS output for different speaker layouts, including 135 x 4 at 2 ohms, 100 x 4 at 4 ohms, and 270 x 2 at 4 ohms bridged. A sealed control area and removable cover keep the tuning section protected, and the badge can be removed with an allen key to access audio settings. Built-in tuning controls give installers room to shape the system with variable 12dB high-pass filters, low-pass filters, x1/x20 crossover frequency multipliers, and variable bass boost at 50Hz. DC auto-sensing turn on and protection circuitry help support dependable daily use. Technical Highlights: Amplifier Type: 4-channel weatherproof Class D car audio amp Power Output: 135 x 4 at 2 ohms RMS, 100 x 4 at 4 ohms RMS, 270 x 2 bridged Voltage And Fuse: 11.5V to 15V operation with 50A recommended fuse Size: 8.875 x 7 x 2.125 in with heavy cast aluminum heat sink Controls: Removable audio control cover with optional wired remote control This SDX-100.4 amp is suited for car stereo builds, UTV systems, powersports audio, and open-air vehicles where space, tuning control, and weatherproof construction matter. Its compact aluminum housing, water- resistant build, and detailed crossover options set it apart for installations that need power and practical system control.

Manufacturer: Sundown Audio

Brand: Sundown Audio

Number of Items: 1

Built-In Media: 1 x SDX-100.4 4-Channel Amplifier

Model Number: A-SDX1004

Mfr Part Number: SDX 100.4

Warranty Description: 1 Year Manufacturer