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Hertz HMD8 DSP 8-Channel Amplifier
Hertz HMD8 DSP 8-Channel Amplifier
Technical Highlights
- Power per channel: 130 watts at 2 Ω, 85 watts at 4 Ω.
- Minimum load impedance 2 Ω, distortion only 0.06% at 4 Ω.
- Bandwidth from 10Hz to 22kHz, signal-to-noise ratio 105 dBA.
- More technical details
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HMD8 DSP by Hertz
The 8-Channel Marine Amplifier HMD8 DSP from Hertz: Experience redefined sound with this high-quality audio technology. With a user-friendly DSP PC software interface and impressive power, the HMD8 DSP can control your entire speaker system and deliver crystal-clear sound pressure in up to three different zones of your boat. Thanks to its robust construction and corrosion-protected circuit board, it guarantees years of listening pleasure on open water. Powerful, durable, and designed for an unparalleled sound experience – that is the HMD8 DSP from Hertz.
Key Features
- Power Supply
- Operating supply voltage 11 - 15 VDC / 2 x 30A
- Power supply 6.5 V - 17 V
- Idle current 1.6 A
- Off 1.7 mA
- Consumption @ 14.4 VDC, 2Ω, max. musical power 55 A
- Remote-IN voltage 6 - 15 VDC (1 mA)
- Remote-OUT voltage 4 - 15 VDC (150 mA)
Audio Specifications
- Amplifier
- Distortion - Total Harmonic Distortion @ 1 kHz, 4Ω, 70% rated power 0.06%
- Damping factor @ 1 kHz, 4Ω, 2 VRMS > 110
- Bandwidth @ -1.5 dB 10Hz - 22kHz
- Signal-to-noise ratio (A-weighted @ 1 V input) Master input 100 dBA
- Signal-to-noise ratio (A-weighted @ 1 V input) Optical input 105 dBA
- Input sensitivity Pre-In 0.6 - 6 VRMS
- Input sensitivity Speaker-In 2.2 - 22 VRMS
- Minimum load impedance
- 8 channels: 2 Ω
- 4Ch - (Bridge 1/2; 3/4; 5/6; 7/8): 4Ω
- Output power (RMS) @28.8 VDC, 1% THD:
- 8 channels @ 4 Ω 85 Watts x 8
- 8 channels @ 2 Ω 130 Watts x 8
- 4Ch (Bridge 1/2; 3/4; 5/6; 7/8) @ 4Ω 260 Watts x 4
Digital Signal Processor
- 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/octave) Linkwitz-Riley (12, 24, 36, 48, 60 dB/octave) Bessel (6, 12, 18, 24, 30, 36, 42, 48, 54, 60 dB/octave) Chebyshev (6, 12, 18, 24, 30, 36, 42, 48, 54, 60 dB/octave) Quasi-linear QLP phase (6, 12 dB/octave)
- Crossover frequency 20 Hz – 20000 Hz integer values
- Phase control 0° - 180°
- Output Equalizer
- Graphic and Parametric modes n. 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 - 54 inches
- Time alignment delay 0 - 15 ms
- Time adjustment step 1 cm
- Memories
- n. 2 memories
- n. 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
Physical Specifications

- Max. size W x H x D (mm) 238 x 49.5 x 155
- Weight (kg) 1.98
Input / Output


Hertz HMD8 DSP Datasheet
Frequently Asked Questions about HMD8 DSP
How does the DSP in the Hertz HMD8 DSP affect the sound?
How does the DSP in the Hertz HMD8 DSP affect the sound?
What power supply does the Hertz HMD8 DSP require?
What power supply does the Hertz HMD8 DSP require?
What audio performance does the HMD8 DSP Marine Amplifier have?
What audio performance does the HMD8 DSP Marine Amplifier have?
What is the function of the signal-to-noise ratio in the HMD8 DSP?
What is the function of the signal-to-noise ratio in the HMD8 DSP?
What role does input and output sensitivity play in the HMD8 DSP?
What role does input and output sensitivity play in the HMD8 DSP?
How does the Hertz HMD8 DSP enhance sound quality?
How does the Hertz HMD8 DSP enhance sound quality?
What compatibility does the HMD8 DSP offer at minimal load?
What compatibility does the HMD8 DSP offer at minimal load?
How is the installation of the HMD8 DSP on the ship designed?
How is the installation of the HMD8 DSP on the ship designed?
How can the HMD8 DSP from Hertz be adjusted to different sound settings?
How can the HMD8 DSP from Hertz be adjusted to different sound settings?
What advantages does the processing of the HMD8 DSP offer in the marine sector?
What advantages does the processing of the HMD8 DSP offer in the marine sector?
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Manufacturer information / responsible person
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