Hertz Marine HMR 20
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Hertz Marine · Code 78333025
Audio playback
Marine Audio
Manufacturer image — HMR 20.
Image: Hertz Marine
Discover the product
The audio source unit Hertz Marine HMR 20 has display 3” COLOR TFT IPS and management 2 audio zones. The connection Bluetooth 5.0 Audio streaming with ID3 Tag Display allows playback from a compatible device. The front panel has an ingress protection rating of IP66.
Compatible equipment
Documented connections for specific catalogue codes, including parts, requirements and manufacturer sources. Selected equipment ranges are covered; an unlisted combination does not imply incompatibility. Each connection path is assessed separately and is not a complete installation design.
4 documented connections · Sources checked: 2026-10-10
Explore connections, components & diagrams ↗
Equipment connection guide ↗
HMC U1 · 78333101
HMR 20 · Direct
3.5 mm wired controller input
No additional adapter is required for this connection.
Functions: Basic audio control from HMC U1.
Functionality and zone assignment follow the capabilities of the specific source unit.
HMC U1 has a separate +12 V wire for button illumination.
Hertz Marine — optional accessory tables · Marine catalogue 2.5.2, pp. 58–59 · checked 2026-10-10
HMC U1 — controller connection · FML004B REV.21C, p. 3 · checked 2026-10-10
HMC U1 · 78333101
HMR 20 · Direct
3.5 mm wired controller input
Additionally required:1 × 78333302 — HMA C3.5
Functions: HMC U1 control over a longer cable run.
HMA C3.5 is intended for the 3.5 mm controller connection.
HMC U1 has a separate +12 V wire for button illumination.
Hertz Marine — optional accessory tables · Marine catalogue 2.5.2, pp. 58–59 · checked 2026-10-10
HMC U1 — controller connection · FML004B REV.21C, p. 3 · checked 2026-10-10
HMA USB AUX IN · 78333304
HMR 20 · Direct
USB / AUX
No additional adapter is required for this connection.
Functions: Brings USB / AUX sockets to an accessible location.
Socket extension; it does not add a new source or capability to the main unit.
Hertz Marine — optional accessory tables · Marine catalogue 2.5.2, pp. 58–59 · checked 2026-10-10
HMB DAB+ · 78333201
HMR 20 · Direct
DAB+ receiver input
No additional adapter is required for this connection.
Functions: Adds DAB+ digital radio.
For HMR 20. Not equivalent to the separate CAPRI HMB DAB+.
The receiver is supplied with the dedicated antenna specified in the catalogue.
Hertz Marine — optional accessory tables · Marine catalogue 2.5.2, pp. 58–59 · checked 2026-10-10
Functions & interfaces
Audio playback
Technical specifications
Equipment type
Source units
Peak power at 4 Ω
4 x 50 W
FRONT PANEL IPX RATING
IP66
Audio zones
2
USB / BLUETOOTH
Yes (2A) / 5
Display
3” COLOR TFT IPS
Protection front view
IP66
Outputs line
2 (1 x L + R per zone)
Output subwoofer (RCA)
1 (Low Pass 60-80-100 Hz)
USB
Yes
Bluetooth
5.0 Audio streaming with ID3 Tag Display
Dimensions device
W 146 (5.75) x H 105 (4.13) x D 132 (5.2) mm (values in parentheses are in inches)
Opening installation
W 120 (4.72) x H 50 (1.97) mm (values in parentheses are in inches)
Depth installation
98 (3.86) mm (values in parentheses are in inches)
Selection & compatibility
This model is included in our catalogue. The exact configuration, compatibility and supply availability are confirmed when you contact us.
Browse the equipment
Kit contents, interfaces and required accessories are checked for the exact part number. Connection to another system does not mean all functions are built in.
Is it right for your vessel?
Tell us about your vessel, existing equipment and requirements. Elmare will help you choose the right configuration.
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+30 210 400 2538
Elmare · 1 Proussis Street, Keratsini