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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
Normal price €1.099,00
Normal price €1.099,00 Selling price €1.099,00
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Mar 22, - Mar 25,
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Normal price €1.099,00
Normal price €1.099,00 Selling price €1.099,00

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

HMD8 DSP

  • Max. size W x H x D (mm) 238 x 49.5 x 155
  • Weight (kg) 1.98

Input / Output

HMD8 DSP

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Hertz HMD8 DSP Datasheet

Frequently Asked Questions about HMD8 DSP


How does the DSP in the Hertz HMD8 DSP affect the sound?

The digital signal processor (DSP) in the HMD8 DSP has a significant impact on sound output by enabling the use of full, high, or low-pass filters as well as band-pass filters. It offers various filter models such as Butterworth, Linkwitz-Riley, Bessel, Chebyshev, and quasi-linear phases with slopes ranging from 6 dB/octave to 60 dB/octave. Different filter slopes can drastically influence the sound character by isolating or blending frequencies. With a crossover frequency range of 20 Hz to 20 kHz, precise sound calibration is possible, which can be adjusted via the DSP PC software.

What power supply does the Hertz HMD8 DSP require?

The Hertz HMD8 DSP requires a supply voltage of 11 to 15 VDC and is powered by a maximum current of 2 x 30A to achieve its full performance. The idle current is 1.6 A, while the consumption at full musical power reaches 55 A. A remote-IN voltage between 6 and 15 VDC at 1 mA is provided, whereas the remote-OUT voltage ranges from 4 to 15 VDC at 150 mA. These technical parameters allow for efficient integration and correct voltage supply for optimal operation on a ship.

What audio performance does the HMD8 DSP Marine Amplifier have?

The HMD8 DSP delivers 85 watts at 4 ohms and 130 watts at 2 ohms with a supply of 28.8 VDC and 1% THD for 8 channels. In bridge mode, 4 channels can be connected in parallel to produce 260 watts per channel at 4 ohms. This power is ideal for marine applications where different zones require different speaker configurations. Distortion remains below 0.06% at lower ratings, while the damping factor is over 110, indicating excellent control over the speaker diaphragm, which is essential for clean sound.

What is the function of the signal-to-noise ratio in the HMD8 DSP?

The signal-to-noise ratio (SNR) is crucial for the HMD8 DSP as it affects audio quality by indicating the measure of the difference between the signal level and the noise. The master input shows an extremely low background noise of 100 dBA, while the optical inputs even reach 105 dBA. High dBA values mean less audible noise compared to the useful signal, resulting in a clean, clear sound image, which is particularly important in demanding audio applications on the water.

What role does input and output sensitivity play in the HMD8 DSP?

Input and output sensitivity is crucial for the compatibility and adaptability of the HMD8 DSP. The pre-in input sensitivity varies between 0.6 and 6 VRMS, while the speaker-in input sensitivity ranges from 2.2 to 22 VRMS. This allows the amplifier to be adjusted to different signal sources and their output levels, ensuring that gain and volume are optimally matched. Too high input gain could lead to clipping, so precise calibration is important to avoid distortion and power losses.

How does the Hertz HMD8 DSP enhance sound quality?

The Hertz HMD8 DSP significantly improves sound quality through its parametric equalizer, which offers ten parametric poles, including peaking, high shelf, low shelf, notch, and all pass with a gain of ±12 dB and a variable Q of 0.5 to 16. Additionally, there are ten graphic poles for adjustments. These detailed regulations allow for fine-tuning of the sound based on the specific acoustic properties of a room or ship, resulting in a customized and high-quality listening experience.

What compatibility does the HMD8 DSP offer at minimal load?

The Hertz HMD8 DSP shows high compatibility with various speaker systems due to its minimum load impedance of 2 ohms at eight channels and 4 ohms in bridge mode. This variability allows for the connection of a wide range of speaker types that have different load requirements. This versatility is particularly advantageous for larger sound installations on ships, where a complex multi-zone system is required. By adapting to different ohm values, optimal performance is ensured, enabling stable operation with various speaker configurations.

How is the installation of the HMD8 DSP on the ship designed?

The installation of the HMD8 DSP from Hertz requires consideration of its physical specifications of 238 mm width, 49.5 mm height, and 155 mm depth, as well as a weight of 1.98 kg. These dimensions allow for easy integration into various boat configurations. The corrosion-protected circuit board also ensures protection against moisture in marine environments. A suitable placement that allows for adequate air circulation is essential for heat dissipation to maintain the efficiency and longevity of the amplifier. The wiring should be aligned with safe voltage levels to ensure optimal functionality.

How can the HMD8 DSP from Hertz be adjusted to different sound settings?

The HMD8 DSP offers seven installation presets via a rotary switch, allowing for quick and easy adjustment to different sound settings. Each zone on the ship can be individually tuned, which is particularly beneficial for various musical preferences. Additionally, through the DSP-PC software, you can set specific configurations to achieve more bass or clearer highs, allowing for a variable sound profile to create the best possible audio experience depending on the environment and musical genre.

What advantages does the processing of the HMD8 DSP offer in the marine sector?

In the marine sector, the HMD8 DSP offers significant advantages due to its robust construction and corrosion-protected circuit board. These features ensure a long lifespan and reliable performance under extreme conditions such as moisture, salt, and temperature fluctuations. The protective mechanisms prevent electrical damage and ensure consistent performance, even when the ship is subjected to vibrations and shocks. The durable materials and targeted processing make this amplifier an ideal choice for any boat owner who values consistently excellent sound quality.

Manufacturer information / responsible person

Elettromedia SpA
62018 Potenza Picena (MC)
Strada Regina km 3,500
Italy

Contact person:
Simone Iampieri
Executive Director Assistant
T +39 0733 870 813
Elettromedia SpA
62018 Potenza Picena (MC) Italy
Strada Regina km 3,500
T + 39 0733 870 870

Contact: simone.iampieri@elettromedia.it

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