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Hertz HMP 1D Monoblock Subwoofer Class D Marine Amplifier, 150W RMS x 1 @ 4 ohms (1% THD) (78270000)
  • Hertz HMP 1D Monoblock Subwoofer Class D Marine Amplifier, 150W RMS x 1 @ 4 ohms (1% THD) (78270000)
Hertz HMP 1D Monoblock Subwoofer Class D Marine Amplifier, 150W RMS x 1 @ 4 ohms (1% THD) (78270000)

Hertz HMP 1D Monoblock Subwoofer Class D Marine Amplifier, 150W RMS x 1 @ 4 ohms (1% THD) (78270000)

UPC: 8018823122139
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$399.99
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The Hertz HMP 1D is a monoblock subwoofer marine amplifier engineered for demanding boat audio systems. Its Class D architecture and purpose-designed marine construction provide controlled power delivery to compatible loudspeakers, with performance dependent on the connected load and channel configuration.

Key Features

  • Compact marine/powersports Class D mono amplifier
  • Selectable low-pass and subsonic filters
  • Adjustable bass boost and remote bass management
  • Automatic remote-on capability
  • Marine corrosion-resistant PCB treatment

Technical Specifications

  • Amplifier type: Class D
  • Channel arrangement: Monoblock Subwoofer
  • Channels: 1
  • Output power ratings:
  • 150W RMS x 1 at 4 ohms (1% THD)
  • 250W RMS x 1 at 2 ohms (1% THD)
  • 180W RMS x 1 at 4 ohms (10% THD)
  • 300W RMS x 1 at 2 ohms (10% THD)
  • Maximum summed advertised power: 300W
  • Minimum load: 2 ohms
  • Supply voltage: 11–15V DC
  • Fuse: 15A
  • Bandwidth: 10–500Hz
  • Low-pass filter: 65/85/115Hz at 12dB/octave
  • Subsonic filter: off / 22 / 32Hz at 12dB/octave
  • Bass boost: off / +6 / +9dB
  • Signal-to-noise: 105dBA
  • Damping factor: 300 at 100Hz / 4 ohms
  • THD: 0.1% at 100Hz / 4 ohms
  • Input sensitivity: 0.2–5V low / 0.8–20V high
  • Dimensions: 223 x 100.5 x 43.6mm
  • Weight: 1.35kg
  • Ingress protection: IP64
  • Manufacturer distinguishes RMS figures at 1% THD and 10% THD; the 300W headline uses the 10% THD test condition

Compatibility

  • Compatible with marine audio sources and speaker systems that meet the listed electrical input and impedance requirements
  • Use 12V nominal electrical configuration; do not substitute a 24V-specific amplifier variant
  • Subwoofer channel output is intended for properly matched bass speakers and crossover settings

Installation & System Integration

  • Choose conductor size, circuit protection, and battery capacity based on the installed system current draw
  • Match each speaker or subwoofer impedance to the manufacturer load ratings, observing all bridging limits
  • Mount away from standing water with suitable airflow and secure corrosion-resistant terminations
  • Configure gain, filter frequencies, and any digital processing prior to high-volume operation

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