More about the product
The Hertz HMP1D is a compact mono amplifier designed for powersport and marine audio systems where space is limited but powerful bass is essential. Built for durability, the HMP1D features a rugged design that resists corrosion and moisture, making it ideal for harsh outdoor environments. Its sealed chassis ensures reliable operation even in challenging conditions.
This amplifier is engineered to deliver strong, clean power to subwoofers. Using Class D technology, the HMP1D provides efficient power delivery while minimising heat generation, which is critical for installations in confined spaces. Despite its small footprint, it offers impressive output, making it suitable for adding deep bass to UTVs, ATVs, motorcycles, and boats.
Connectivity is simple and practical. The HMP1D includes RCA inputs for easy integration into existing audio systems and corrosion-resistant terminals for secure connections. Its compact size allows flexible mounting options, and the design ensures long-term reliability without compromising performance.
The HMP1D focuses on pure amplification without unnecessary extras. It does not include Bluetooth or streaming features, keeping the design dedicated to powering subwoofers effectively. Installation is straightforward for those familiar with audio setups, but professional installation may be recommended for optimal results.
This amplifier is perfect for enhancing low-frequency response in compact audio systems, delivering deep and powerful bass that complements the overall sound experience. Its combination of rugged construction, efficient performance, and small size makes it a practical choice for anyone upgrading their powersport or marine audio system.
Technical details
- Brand
- Hertz
- Channels
- 1
- Impedance
- @ 2 Ch: 2 Ω
- Output Power
- 1 Ch: 150 W x 1 (4Ω)|1 Ch: 250 W x 1 (2Ω)
- Size
- 8.77 x 3.95 x 1.70 inches
- Total Power
- 300W
- Weight
- 1.35kg
Look out for Bankstown Sound Recommendations
The Hertz HMP1D is ideal for UTV, ATV, motorcycle, and marine audio systems where space is limited but strong bass is desired. It suits those who value durability and efficiency in harsh conditions. Compared to larger amplifiers, it offers easier installation and better reliability outdoors. However, it does not include wireless features or multi-channel capability, so those seeking full-range amplification may prefer a bigger model. For anyone focused on powering subwoofers with clean, powerful bass in a compact form, the HMP1D is an excellent choice.
Why Choose Bankstown Sound for Your Car Audio & Tech Upgrades
At our Bankstown Sound store and workshop in Sydney, our team ensures every car and auto audio installation and upgrade starts with an understanding of how you use your car. Our team works with you to understand your driving habits, the features you rely on, and the problems you’re trying to solve.
Most factory setups are built to broad standards and often lack the clarity or seamless connectivity required for how people actually drive. That’s why we focus on modernising your dashboard and audio performance based on how you use your vehicle.

