Hertz S8 DSP — Precision 8-Channel Processing for High-Performance Harley Audio
The Hertz S8 DSP is a compact, high-resolution digital signal processor engineered for riders who want full control of their audio system. With 8 processed channels, 96 kHz / 24-bit capability, advanced crossovers, time alignment, and a tiny footprint that fits easily inside Harley fairings, the S8 DSP is the foundation of any properly tuned multi-amp motorcycle system.
Key Features
- 8 processed channels for full active front stages, mid-bass, and sub control.
- Hi-Res Audio support with 96 kHz / 24-bit converters for cleaner tuning precision.
- 15-band parametric EQ per output channel and 7-band paragraphic EQ per input channel, plus or minus 12 dB in 0.1 dB steps with adjustable Q and frequency.
- Time alignment from 0 to 13.5 ms (0 to 468.4 cm / 0 to 184.4 in) for accurate staging at the rider's position.
- Adjustable crossovers on all channels with Butterworth, Linkwitz-Riley and Bessel alignments, 6 dB/oct to 30 dB/oct in 6 dB steps.
- Analog Devices ADAU1451 DSP with 32-bit processing.
- Coaxial S/PDIF digital input up to 24-bit / 96 kHz.
- Bluetooth 5.0 for wireless tuning and control.
- Compact chassis (130 × 88 × 33 mm) fits inside Street Glide and Road Glide fairings.
- OEM-friendly integration with high-level inputs and summing capability.
- Windows, macOS and mobile tuning — full software for Windows 10/11 and macOS 10.13 or later, plus an iOS and Android Configurator app over Bluetooth 5.0.
Why It Works on Harleys
- Ultra-compact size allows fairing mounting even in multi-amp systems.
- High-level input compatibility integrates with factory 2014+ Harley radios.
- Multiple preset capability to tailor sound for solo, two-up, or demo (parked) modes.
- Fine-grained EQ and time alignment compensates for fairing location differences.
- DRC control from your phone — the iOS and Android app adjusts volume, subwoofer level and preset selection. Note there is no hardware remote supplied in the box.
- Essential for active systems running SP4.900, SP4.500, SP1.900, and multi-amp setups.
Recommended System Use
- Active front stages: midrange + tweeter crossover and alignment.
- Mid-bass and subwoofer control: dedicated low-frequency EQ and filtering.
- 4–8 channel amplifier systems: Street Glide, Road Glide, Ultra, CVO builds.
- High-end tuning: for maximising clarity and SPL at highway speeds.
Fitment
- Suitable for all Harley-Davidson Touring models.
- Installs in fairings, inner fairing cavities, or custom amp racks.
- Compatible with both factory and aftermarket head units.
Specifications
| Processed Channels | 8 |
| Input Channels | 6 (High/Low Level) |
| DSP | Analog Devices ADAU1451, 32-bit processing |
| Sampling Rate | 96 kHz |
| Resolution | 24-bit |
| Digital Input | Coaxial S/PDIF, up to 24-bit / 96 kHz |
| EQ (Output) | 15-band parametric per channel, ±12 dB in 0.1 dB steps, adjustable Q and frequency |
| EQ (Input) | 7-band paragraphic per channel, ±12 dB in 0.1 dB steps, adjustable Q and frequency |
| Crossover Types | HPF / LPF / Band-Pass, Butterworth, Linkwitz-Riley and Bessel on all channels |
| Crossover Slopes | 6 dB/oct to 30 dB/oct in 6 dB steps |
| Time Alignment | 0–13.5 ms, 0–468.4 cm (0–184.4 in) per channel |
| Input Sensitivity (Low Level) | 0.8 – 6 V RMS |
| Input Sensitivity (High Level) | 2.5 – 21 V RMS |
| Max Output | 4 V @ 0.05% THD |
| THD+N | <0.005% @ 1 Vrms out, 1 kHz |
| Signal-to-Noise Ratio | 105 dBA (analog in) / 112 dBA (digital in) |
| Bluetooth | Bluetooth 5.0 |
| Software | Windows 10/11, macOS 10.13 or later, plus iOS and Android Configurator app via Bluetooth |
| DRC Control | Via iOS/Android app — volume, subwoofer level, preset selection (no hardware remote supplied) |
| Supply Voltage | 7 – 20 VDC, 1 A |
| Dimensions | 130 × 88 × 33 mm |
| Weight | 0.66 kg |
| In the Box | Cables, 1 A fuse, screws, USB stick with software, manual |
Specifications per Hertz published technical documentation.
Need Help With DSP Setup?
The S8 DSP is a powerful tool for unlocking maximum clarity, staging, and output from your Harley audio system. If you're building a multi-amp or active setup, we can help design a complete signal path that gets the most from your speakers and amplifiers.
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.