Hertz SP 1.900 — 1000 W Mono Amplifier for Harley Subwoofer Systems
The Hertz SP 1.900 is a high-power mono Class-D amplifier engineered for motorcycle subwoofer systems that demand serious output. Delivering 1000 W RMS at both 2 Ω and 1 Ω, and built in an IP55 weather-resistant chassis, it is the ideal sub amplifier for Harley-Davidson Touring models running Tour-Pak or saddlebag subwoofers.
Key Features
- 1000 W RMS output @ 1 Ω or 2 Ω — regulated design for consistent performance.
- Stable at 1 ohm for flexible wiring of multiple subwoofers.
- IP55 water and dust resistance for motorcycle environments.
- Subsonic filter protects shallow enclosures and prevents over-excursion.
- Low-pass crossover for clean subwoofer integration.
- Compact chassis (240 × 131 × 49 mm) fits Harley fairings and Tour-Paks.
- High-level and low-level inputs for full compatibility with factory and aftermarket head units.
Why It Works on Harleys
- Ideal power match for shallow subs like the Hertz MPS 250 S2/S4.
- Consistent 1000 W output delivers strong low-end even with wind and road noise.
- Compact, rugged chassis withstands heat, vibration, and moisture.
- Flexible wiring options suit single or dual subwoofer configurations.
Recommended System Use
- Subwoofers: MPS 250 S2, MPS 250 S4, CS 250 S4
- Ideal Power: 800–1000 W RMS per sub system
- Low-Pass Filter: 80–120 Hz @ 12–24 dB/octave
- Subsonic Filter: 20–35 Hz (recommended for shallow enclosures)
Electrical Requirements
- High-current amplifier — expect significant power draw at full output.
- Recommended Fuse: 100–120 A (check your specific harness).
- Wiring: 0 AWG or 4 AWG depending on cable length.
- Charging Note: Big subwoofer systems may require a high-output stator and/or a secondary battery.
Fitment
- Designed for Harley-Davidson Touring motorcycles
- Fits fairings, Tour-Paks, side compartments and custom amp racks
- Compatible with factory and aftermarket head units
Specifications
| Channels | 1 (Monoblock) |
| RMS Power @ 4 Ω | 700 W |
| RMS Power @ 2 Ω | 1000 W |
| RMS Power @ 1 Ω | 1000 W |
| Frequency Response | 5–500 Hz |
| Signal-to-Noise Ratio | > 100 dB |
| Crossovers | Low-Pass / Subsonic |
| Dimensions | 240 × 131 × 49 mm |
| IP Rating | IP55 |
Need Subwoofer System Design?
Matching the SP 1.900 to the right sub, enclosure volume, and wiring configuration is critical. We can help you build a hard-hitting sub setup tailored to your Harley.
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.