Hertz Marine HMD8 DSP Amp 8 Channel Class D IP64 Marine Amplifier 85w RMS
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The Hertz Marine HMD8 DSP is an 8-channel Class D marine amplifier with built-in DSP, delivering 8 x 85W RMS at 4 ohms or 4 x 260W bridged. Up to 3 listening zones can be configured via Hertz Navigator PC software. The IP64-rated, ASTM-B117 salt fog tested aluminium chassis uses marine-grade epoxy-coated PCBs. Part of the Hertz Marine range.
This listing is the 12V version. The HMD8 DSP is also available in 24V for larger vessels.
Key specifications
- Channels: 8, Class D with built-in DSP
- Power (RMS @ 4 ohm): 8 x 85W
- Power (RMS @ 2 ohm): 8 x 130W
- Bridged power: 4 x 260W @ 4 ohm
- Listening zones: up to 3
- Output EQ: 10 parametric and 10 graphic poles
- Time alignment: 0–15 ms
- Protection rating: IP64, ASTM-B117 salt fog tested
- Dimensions: 238 x 49.5 x 155 mm
The HMD8 DSP uses Hertz Marine DSP technology to maintain consistent sound quality across up to 3 independent listening zones on board. The advanced Class D output stage combines high efficiency with compact dimensions, making installation straightforward in almost any position on the vessel.
Features
- Built-in DSP — Hertz Marine DSP technology preserves a consistent surround effect throughout the boat, including outdoor listening areas.
- Multi-zone setup — Acoustic performance is independently optimised for each of the 3 configurable listening zones, regardless of speaker placement or listener position within the zone.
- PC software — Hertz Navigator software lets you create pre-optimised setup files for a specific vessel and audio system, delivering accurate acoustic results quickly.
- Advanced Class D output — The Class D output stage delivers maximum sound quality with high efficiency, keeping the unit compact and easy to install.
- Corrosion-resistant PCBs — Marine-grade epoxy-coated PCB boards protect against corrosion caused by exposure to wet environments.
- Salt fog proof — Tested to ASTM-B117 standards with heavy salt fog spray, confirming full resistance to salt-air corrosion.
- IP64 water jet protection — IP64 rating confirms full protection against water jets, making the HMD8 DSP suitable for demanding open-water use.
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Specification
| Operating power supply voltage | 11 ÷ 15 VDC / 2 x 30A |
|---|---|
| Power supply | 6.5V ÷ 17V |
| Idling current | 1.6 A |
| Switched off | 1.7mA |
| Remote IN voltage | 6 ÷ 15 VDC (1 mA) |
| Remote OUT voltage | 4 ÷ 15 VDC (150 mA) |
| Damping factor @ 1 kHz, 4Ω, 2 VRMS | > 110 |
| Bandwidth @ -1.5 dB | 10Hz ÷ 22kHz |
| Input sensitivity Pre-In | 0.6 ÷ 6 VRMS |
| Input sensitivity Speaker-In | 2.2 ÷ 22 VRMS |
| Minimum load impedance | 8Ch: 2Ω 4Ch - (Bridge 1/2; 3/4; 5/6; 7/8): 4Ω |
| OUTPUT POWER (RMS) @28.8 VDC, 1% THD | 8Ch @ 4Ω: 85 W x 88Ch @ 2Ω: 130 W x 84Ch (Bridge 1/2; 3/4; 5/6; 7/8) @ 4Ω: 260 W x 4 |
| Filter type | Full / High pass / Low pass / Band pass |
| Filter model and slope | Butterworth (6, 12, 18, 24, 30, 36, 42, 48, 54, 60 dB/oct)Linkwitz-Riley (12, 24, 36, 48, 60 dB/oct)Bessel (6, 12, 18, 24, 30, 36, 42, 48, 54, 60 dB/oct)Chebyshev (6, 12, 18, 24, 30, 36, 42, 48, 54, 60 dB/oct)QLP quasi-linear phase (6, 12 dB/oct) |
| Crossover frequency | 20 Hz – 20000 Hz integer values |
| Phase control | 0 ° - 180°, all pass equalizer poles |
| Output equalizer | Graphic and Parametric modesn. 10 parametric poles (Peaking, High Shelf, Low Shelf, Notch, All pass) ±12 dB gain, variable Q (0.5 – 16.0)n. 10 graphic poles |
| Time alignment distance | 0 - 510 cm (0 – 200.8 inches) |
| Time alignment delay | 0 - 15 ms |
| Time alignment step | 1 cm |
| Time alignment fine set step | 1 sample |
| Memories | n. 2 memoriesn. 3 parametric poles for each memory (Peaking, High Shelf, Low Shelf) ±12 dB gain, variable Q (0.5 – 16.0) |
| Preset | Rotary switch for 7 installation presets |
| Max size W x H x D (mm/inch) | 238 x 49,5 x 155 / 9.37 x 1.95 x 6.1 |
| Weight | (kg/lbs) 1,98 / 4.36 |
More specs
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What's Included
- HMD8 DSP
Hertz
About the Hertz HMD8 DSP
From our tech experts at CEN
An 8-channel digital sound processor with equalisation and time alignment, the piece that corrects for the fact that a car is an acoustically awful place to listen to music.
Who it suits
Anyone who has bought good speakers and amplification and still feels the sound arrives from the wrong place. A DSP is also what makes a factory-fit system usable as a signal source when the head unit cannot be replaced.
Our tech experts advise
A processor is only worth what the tuning puts into it: the hardware does nothing until someone measures the car and sets delays, crossovers and EQ for where you sit. We tune DSPs in the vehicle at our Beeston workshop. Installation is priced per vehicle, so get in touch with your make, model and year and we will confirm what it needs. See car audio installation.
Explore the full Hertz range at CEN, with fast UK dispatch and expert advice from our Nottingham team. Shop all Hertz
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Frequently Asked Questions
Q: How much power does the HMD8 DSP produce?
A: It delivers 8 x 85W RMS at 4 ohms or 8 x 130W RMS at 2 ohms, and can be bridged to 4 x 260W RMS at 4 ohms.
Q: Is the HMD8 DSP for 12V or 24V boats?
A: The HMD8 DSP is the 12V version. A 24V version, the HMD8 DSP 24V, is also available.
Q: How do I set up the DSP on the HMD8 DSP?
A: It is set up with the Hertz Navigator PC software, which can store pre-optimised setup files for a specific boat model and audio system. A rotary switch also selects from 7 installation presets.
