Hertz HMP1D — Compact 1-Channel Class-D Motorcycle Subwoofer Amplifier (300W RMS @ 2Ω)
| Channels | 1 Channel |
| Power | 300W RMS |
| Year Range | 1998-2013, 2014-2023, 2024+ |
Hertz HMP 1D — Compact Mono Amplifier for Reliable Motorcycle Bass
The Hertz HMP 1D is a compact, weather-resistant mono amplifier designed for riders who want clean, controlled bass without the heavy electrical demands of high-output sub systems. With flexible filters, a remote level control, and an IP64-rated chassis, it’s ideal for powering 8–10″ motorcycle subwoofers in fairings, Tour-Paks, or custom bag enclosures.
Key Features
- 150 W RMS @ 4 Ω — ideal for compact subs and daily-use bass enhancement.
- 250–300 W RMS @ 2 Ω depending on charging system conditions.
- IP64 weather-resistant chassis for real-world motorcycle environments.
- Ultra-compact size (184 × 102 × 43.6 mm) for fairing and side-cover installs.
- Remote bass level control included for on-the-fly adjustment.
- Full/High-Pass/Low-Pass/Subsonic filters for full system flexibility.
- High and low level inputs for OEM and aftermarket radio compatibility.
Why It Works on Harleys
- Small footprint fits comfortably in Street Glide and Road Glide fairings.
- IP64 rating protects against rain, washdowns, and dust.
- Lower current draw than high-output mono amps — ideal for stock charging systems.
- Perfect match for shallow 8–10″ subs in compact motorcycle enclosures.
Recommended System Use
- Compact Subwoofer Systems: 8–10″ subs in Tour-Pak, side cover, or saddlebag enclosures.
- Daily-Ride Bass: Clean low-end support without overloading the electrical system.
- Budget or Mid-Level Systems: Pair with the HMP 4D for a complete 4-channel + sub configuration.
Fitment
- Suitable for all Harley-Davidson Touring motorcycles.
- Compact enough for under-radio, inner-fairing, or side-cover mounting.
- Works with factory or aftermarket head units.
Specifications
| Channels | 1 (Mono) |
| RMS Power @ 4 Ω | 150 W |
| RMS Power @ 2 Ω | 250–300 W |
| Frequency Response | 10–45,000 Hz |
| Crossovers | Full / HPF / LPF / Subsonic |
| Input Sensitivity | 0.2–5 V |
| S/N Ratio | > 85 dB |
| Dimensions | 184 × 102 × 43.6 mm |
| IP Rating | IP64 |
| Remote Level Control | Included |
Need Help Building Your Bass System?
If you’re planning a compact, reliable subwoofer upgrade for your Harley, the HMP 1D is an excellent solution. We can help you match it to the right enclosure and subwoofer for your setup.
Australia Shipping:
- Under $500 → $19.95
- $500–$2,500 → $14.95
- Over $2,500 → FREE
- Bulky items → +$24.95 surcharge (waived over $2,500)
Fast dispatch from Brisbane. Same-day shipping on in-stock orders before 1pm AEST.
Change-of-mind returns: We accept returns within 7 days of delivery on unused, unopened products in original sealed packaging. Restocking fees apply (20–30%). Return shipping is the customer's responsibility.
No returns on opened audio gear, installed items, custom orders, or special-order products. Please check fitment carefully before installing.
Faulty or incorrect items: If you experience an issue, contact us with photos/video and your order number. We'll assess the claim and arrange repair, replacement, or refund for verified faults under the Australian Consumer Law.
Fitment assistance: If you're unsure about compatibility, reach out before ordering—we're happy to help.