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.
Shipping
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.
Return policy
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.