MB Quart - DA2-520.4D Discus 520 Watt Waterproof 4 Channel Amplifier

MB Quart Discus DA2-520.4D Compact Waterproof 520W 4-Channel Amplifier

Upgrade your marine, mobile, or powersports audio system with the MB Quart Discus DA2-520.4D, a compact, waterproof 4-channel Class D amplifier delivering up to 520 watts of clean, efficient power. Designed for universal fitment, it combines rugged IP67-rated construction, potted internals, and top-mounted controls for easy sound tuning.

Powerful 4-Channel Performance

• Max Power: 520W
• 4 x 130W @ 2 Ohms
• 4 x 90W @ 4 Ohms
• Bridged Mono: 2 x 260W @ 4 Ohms
• Class D efficient topology with robust MOSFET PWM power supply

Marine-Grade Waterproof Protection

• IP67 rated for water and dust resistance
• Potted internals for moisture protection
• Waterproof connectors ensure reliable signal transmission
• Durable construction for harsh outdoor environments

Precision Sound Control

• Variable electronic crossovers (High-Pass: 15Hz–300Hz, Low-Pass: 50Hz–300Hz)
• Adjustable input sensitivity (0.2V–9V)
• Onboard bass boost and sound contouring
• Q-Stasis low-noise preamplifier for minimal distortion

Advanced Output Technology

• MB Quart FLUID-FETS output devices for high-efficiency, high-quality sound
• Heavy-duty heatsink efficiently manages thermal load
• Electronic equalizer allows precise frequency tailoring
• RCA inputs prewired to PCB for added durability

Protection & Diagnostics

• Top-mounted LED indicators for overload and speaker short protection
• Waterproof connectors for reliable, corrosion-free connections
• 90A external fuse for additional safety

Technical Specifications

• Channels: 4
• Class: D
• Frequency Response: 15Hz–300Hz
• Power Terminals: 4 AWG
• Speaker Terminals: 12 AWG
• IP Rating: IP67
• Color: Black
• Warranty: 1 Year
• Universal Fitment

Reliable, compact, and marine-grade waterproof, the MB Quart Discus DA2-520.4D amplifier delivers versatile 4-channel performance for any audio system in harsh outdoor or mobile environments.