Hertz HMR 20 3" Marine Digital Media Receiver with 2-Zone Audio Control

Hertz HMR 20 is a marine-grade digital media receiver designed for boat audio systems that need modern source support, clear daylight visibility, and independent control of multiple listening areas. It features a 3-inch color TFT IPS display with a UV-resistant front panel and weather-resistant design for marine environments.

The HMR 20 supports two independently controlled stereo zones through dual stereo pre-outs, allowing separate audio adjustment between different boat listening areas. It integrates AM/FM radio, Bluetooth audio streaming, USB playback, and AUX input, making it suitable for marine systems using external amplifiers, subwoofers, and add-on accessories.

Key Performance Features

• Marine digital media receiver with sealed weather-resistant front panel
• 3-inch color TFT IPS display for strong daylight visibility
• Independent control of two stereo audio zones
• Built-in MOSFET amplifier rated at 50W x 4 peak
• Bluetooth audio streaming
• AM/FM PLL tuner with RDS
• USB 2.0 audio playback with device charging
• AUX input for external audio sources
• Multicolor button illumination
• Battery voltage indicator and warning system

Audio Output

• Built-in amplifier: 22W x 4 RMS at 4Ω (14.4V, THD+N ≤1%); 50W x 4 peak. Use 4–8Ω speakers.
• Line outputs: 2 stereo pre-outs for Zone 1 and Zone 2, plus a Zone 1 subwoofer RCA output. The subwoofer level follows Zone 1 with relative adjustment; it is not a third independent zone.
• Zone control: Independent volume control for 2 listening areas
• Equalization: 4 EQ presets

Inputs & Control

• Bluetooth audio streaming
• AM/FM tuner with RDS
• USB 2.0 input
• AUX input
• DAB+ ready with optional external module
• Compatible with optional HMC U1 wired remote control
• Battery voltage gauge and over/low voltage alert

Installation Use Cases

• Marine audio systems needing a compact digital media receiver
• Boats with two separate listening areas requiring independent zone control
• Systems using external amplifiers and subwoofers
• Helm installations requiring a weather-resistant source unit
• Marine installs needing Bluetooth, USB, and AM/FM in one receiver

Technical Specifications

• Brand: Hertz
• Model: HMR 20
• Product Type: Marine digital media receiver
• Display: 3" color TFT IPS, 640 x 360 pixels
• Audio Zones: 2
• Bluetooth: Yes
• AM/FM Tuner: Yes
• USB: USB 2.0
• AUX Input: Yes
• DAB+ Ready: Yes, with optional module
• Built-In Amplifier: 50W x 4 peak
• Power Supply Voltage: 12 VDC (10 to 16 V allowable)
• Grounding System: Negative ground
• Operating Temperature Range: -20°C to 70°C (-4°F to 158°F)
• Protection Rating: Front panel rated IP66 (IEC 60529); protect rear connections according to the installation manual.
• UV Resistance Standard: ASTM-D4329
• USB Maximum Current Output: 2 A
• USB Voltage: 5.0 V
• Supported Audio Formats: MP3, WMA, WAV (16-bit/44.1 kHz only)
• Maximum USB Capacity: 64 GB
• Compatible File System: FAT/FAT32
• Voltage Gauge: Yes
• Over/Low Voltage Alert: Yes
• Dimensions: Confirm the supplied mounting template and instructions for your unit before cutting. Published product-page and manual cutout/depth figures differ slightly; the reference table below is not a cutting template.

Identifiers & Packaging

• Manufacturer Part Number (MPN): HMR 20
• Sold As: Single marine receiver
• Quantity: 1 receiver
• Included: Silicone cover, four 3.5 × 38 mm mounting screws, 150 cm USB extension and 16 cm power/speaker harness. DAB+ module and HMC U1 remote are optional and sold separately.

Why Buy From MCOR Automotive

• Authorized retailer for the brands we sell
• Marine and 12V system integration experience
• Accurate product data and expert support for source unit, amplifier, and zone-control system planning

Unit Size mm (in.)	W 146 (5.75) x H 105 (4.13) x D 132 (5.2)
Mounting Hole size mm (in.)	W 120 (4.72) x H 50 (1.97)
Mounting Depth mm (in.)	98 (3.86)
Mounting Method	Screw

Fitment, Installation & Warranty Notes

• Fitment Help: Need help confirming fitment, compatibility, amplifier matching, or installation parts? Use our Fit Guide or contact us through the chat button before ordering.
• Authorized Retailer: MCOR Automotive is an authorized Hertz retailer. Products purchased from MCOR include applicable manufacturer warranty coverage when installed and used according to manufacturer guidelines.