Take your marine audio system to the next level with the MB Quart Discus 2 Channel Marine Amplifier, engineered for powerful performance and rugged durability in harsh environments. Delivering up to 500 watts of clean, efficient power at 2 ohms of amp power and 300 watts at 4 ohms of amp power, this amplifier is built to handle life on the water while providing exceptional sound clarity and control. Its potted internal components add an extra layer of protection against moisture, vibration, and corrosion, making it ideal for boats, UTVs, and other outdoor applications.
At the heart of the system is a highly efficient Class D topology, allowing the amplifier to generate significant power while maintaining a compact design and minimizing strain on your electrical system. The premium MOSFET Pulse Width Modulation power supply ensures consistent output, while MB Quart’s FLUID-FET output devices deliver clean, high-quality sound that rivals high-end home audio systems.
MB Quart Discus 2 Channel Marine Amplifier with Top Mounted Controls, 500 Watts - 431770
The Q-Stasis preamplifier stage maximizes low-voltage input signals with minimal distortion, preserving audio detail and clarity. Variable electronic crossovers and onboard sound contouring features, including bass boost and adjustable input sensitivity, allow you to fine-tune your system for optimal performance.
Built for convenience and reliability, the amplifier features waterproof connectors and prewired RCA inputs for secure, corrosion-resistant connections. Top-mounted controls are sealed for protection yet easily accessible for quick adjustments. LED system diagnostics provide real-time feedback for overload and short protection, ensuring your system stays safe and performing at its best.
Features
- MB Quart Discus 2 channel amp delivers 2x250W @ 2 ohm, 2x150W @ 4 ohm, or 500W bridged @ 4 ohm—ideal marine amp, motorcycle amp, and UTV audio system upgrade
- Fully sealed, waterproof, and dustproof design built for boats, ATVs, UTVs, motorcycles, and outdoor audio systems in harsh environments
- Small footprint amplifier is perfect for tight installs where space is limited
- Advanced Class D technology produces powerful, clean sound while reducing heat and electrical load for tight installs and powersports applications
- Variable high/low pass crossover (15Hz–300Hz), adjustable input sensitivity (0.2V–9V), waterproof connections, and LED protection indicators for reliable performance
- Color: Black
- Dimensions (L x W x H): 22.0 x 6.0 x 4.0 inches
- Weight: 5.85 pounds
What our Experts Think
-
Powerful marine performance: The MB Quart Discus 2 Channel Marine Amplifier 431770 delivers up to 500 watts of power, providing clear, dynamic sound for boats, ATVs, and outdoor audio systems.
-
Built for marine environments: Designed with marine-grade protection, it helps withstand moisture, UV exposure, and harsh outdoor conditions for reliable long-term use.
-
Easy installation and control: The top-mounted controls make tuning and adjustments quick and convenient, especially in tight installation spaces.
-
Clean, efficient sound: Its 2-channel design offers strong amplification with balanced audio output, improving bass response and overall listening quality.
-
Expert recommendation: A great choice for customers looking for a durable, high-performance marine amplifier that combines power, reliability, and user-friendly operation.
Q&A
Q: What is the MB Quart Discus 2 Channel Marine Amplifier 431770?
A: The MB Quart Discus DA2-500.2D is a waterproof 2-channel marine amplifier designed to deliver powerful, clean audio performance for boats, UTVs, motorcycles, and outdoor sound systems.
Q: How much power does this marine amplifier provide?
A: It delivers up to 500 watts of maximum power, with 2 x 250W at 2 ohms, 2 x 150W at 4 ohms, or 500W bridged at 4 ohms.
Q: Is the MB Quart Discus amplifier waterproof?
A: Yes. It features an IP67-rated waterproof and dustproof design with sealed components and waterproof connectors for harsh marine environments.
Q: Does it have adjustable sound controls?
A: Yes. The amplifier includes top-mounted controls, adjustable input sensitivity, bass boost, and variable electronic crossover settings for customized sound tuning.
Q: What vehicles is this amplifier compatible with?
A: This compact Class D amplifier is ideal for marine boats, ATVs, UTVs, motorcycles, and other powersports audio installations.
Q: Why choose a Class D marine amplifier?
A: Class D technology provides efficient power output in a compact design while helping reduce heat and electrical load.
Maintenance Tips
Damage 
Loss 
Theft 
