Raymarine B75MH Thru-Hull CHIRP Transducer Pair, 12° Tilt, 600W, Bronze, Depth/Temperature

Overview

The Raymarine T70065 is a B75M and B75H 12° tilted-element thru-hull CHIRP transducer pair for boats that need medium and high CHIRP coverage from a permanent below-waterline installation. The pair records depth and water temperature and uses bronze low-profile housings for fiberglass or wood hulls.

The medium CHIRP element covers 80 to 130 kHz with a 24° to 16° beamwidth, while the high CHIRP element covers 130 to 210 kHz with a 15° to 9° beamwidth. This gives anglers and cruisers a practical split between wider mid-frequency coverage for finding bottom and fish structure, and narrower high-frequency detail for bait, targets, wrecks, reefs, and other structure.

The 12° tilted elements are made for hulls with 8° to 15° of deadrise, helping the sonar beam point more directly downward after the transducers are installed. Each transducer is rated at 600 W RMS, and the included Y-cable brings the pair together for connection to compatible Raymarine CHIRP sonar systems.

Key features

• B75M and B75H thru-hull CHIRP transducer pair for medium and high frequency sonar coverage.
• 12° tilted-element layout for fiberglass or wood hulls with 8° to 15° deadrise.
• Medium CHIRP operates from 80 to 130 kHz with a 24° to 16° beamwidth.
• High CHIRP operates from 130 to 210 kHz with a 15° to 9° beamwidth.
• Depth and fast-response water temperature sensing support fishing, cruising, and bottom-tracking use.
• Bronze low-profile housings suit permanent thru-hull mounting below the waterline.
• 600 W RMS power rating on each transducer for use with Raymarine CHIRP sonar modules.
• Y-cable included for pairing the two transducers into the sonar connection.

Installation and fit

This transducer set is for thru-hull installation, so hull access, correct fairing of the mounting area, and proper sealing are important parts of the job. The low-profile B75 body keeps the installation close to the hull surface, which helps reduce external drag compared with larger external fairing blocks.

The 12° tilt is the key fit detail. It suits moderate-deadrise locations, typically 8° to 15°, and should be matched to the actual mounting point on the hull rather than the boat model alone. On planing hulls, the mounting location should stay in clean water while underway so the sonar can maintain a steady return.

Electrical and system integration

The transducers are intended for Raymarine CHIRP sonar installations that support separate medium and high CHIRP inputs through the paired connection. The included Y-cable is used to combine the B75M and B75H transducers for the sonar module connection, reducing the need to run the two elements as unrelated sensors.

This is a sonar transducer set, not a stand-alone display. It needs a compatible Raymarine sonar module or multifunction display system with the correct CHIRP transducer support and cabling path. Before installation, confirm the sonar module, connector style, cable route, and available bilge access at the chosen mounting point.

Use cases on board

The medium band is useful when coverage and bottom tracking matter, such as coastal cruising, finding contour changes, or searching broader areas while fishing. The high band gives a tighter beam and better target separation for checking structure, bait, and fish close to reefs, wrecks, ledges, or bottom features.

This pair is a strong match for owners upgrading a fiberglass or wood boat to CHIRP sonar where a permanent thru-hull installation is preferred over a transom mount. It is especially relevant for fishing boats and serious cruising boats where clean sonar returns at the helm matter more than a quick clamp-on installation.

What’s included

• 1 B75M 12° tilted-element bronze thru-hull CHIRP transducer.
• 1 B75H 12° tilted-element bronze thru-hull CHIRP transducer.
• 1 Y-cable for connecting the transducer pair to the sonar system.

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