Hertz Marine HMD8 DSP 24V Amp 8 Channel Class D IP64 Marine Amplifier 85w RMS
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The Hertz Marine HMD8 DSP 24V is an 8-channel Class D marine amplifier with built-in DSP, rated at 8 x 85W RMS at 4 ohms (or 4 x 260W bridged), designed for 24V vessels. It supports up to 3 listening zones, carries an IP64 protection rating, and is part of the Hertz Marine range.
This listing is the 24V version. The HMD8 DSP is also available in a 12V version (HMD8 DSP). For a matching 24V mono subwoofer amplifier, see the HMD1 24V.
Key specifications
- Channels: 8, Class D with built-in DSP
- Power supply: 22 to 34 V DC (24V systems), fuse 2 x 15 A; operating range 14 to 36 V DC
- 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: IP64, ASTM-B117 salt fog tested
- Size: 238 x 49.5 x 155 mm
The HMD8 DSP 24V uses Hertz Marine DSP technology to manage audio across up to 3 separate zones on board. The Hertz Navigator PC software handles setup, letting you configure pre-optimised profiles for a specific vessel and speaker system quickly. An extruded aluminium chassis and marine-grade epoxy-coated PCBs protect the internals from corrosion and moisture in open-water conditions.
Features
- Built-in DSP – Hertz Marine DSP maintains a consistent surround effect across the vessel, including outdoor listening positions.
- Multi-zone setup – Up to 3 listening zones can be independently optimised for speaker placement and passenger position within each zone.
- PC software – Hertz Navigator allows pre-optimised setup files to be created for a specific boat model and audio installation, reducing setup time.
- Advanced Class D – The Class D output stage combines efficiency with compact dimensions, making installation straightforward in confined spaces.
- Corrosion resistant – Marine-grade epoxy-coated PCBs protect against corrosion caused by exposure to wet environments.
- Salt fog proof – Tested to ASTM-B117 standards with salt fog spray to verify full corrosion resistance.
- IP64 rated – Fully protected against dust ingress and water jets, meeting IP64 requirements for marine use.
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Specification
| Power supply voltage / fuse | 22 ÷ 34 VDC / 2 x 15A |
|---|---|
| Operating power supply voltage | 14V ÷ 36V |
| Idling current | 0.96 A |
| Switched off | 1.6mA |
| Remote IN voltage | 6 ÷ 34 V |
| Remote OUT voltage | 14 ÷ 34 VDC |
| 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 24V
Hertz
About the Hertz HMD8 DSP 24V
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.
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Frequently Asked Questions
Q: How much power does the HMD8 DSP 24V 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 24V for 12V or 24V boats?
A: The HMD8 DSP 24V is the 24V version for vessels with a 24V electrical system. A 12V version, the HMD8 DSP, is also available.
Q: How do I set up the DSP on the HMD8 DSP 24V?
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.
