Discover Superior Underwater Imaging with the B75LM Thru-Hull Chirp Transducer Pair

Upgrade your vessel's sonar capabilities with this precision-engineered pair of Raymarine B75LM thru-hull transducers. Designed for boaters who demand crystal-clear depth readings and temperature data, these bronze units deliver exceptional performance across low and medium Chirp frequencies. Whether you're navigating challenging waters or hunting for fish in deeper zones, their 0-degree orientation ensures optimal signal transmission without distortion, making them a go-to choice for fiberglass and wood hulls.

The dual setup allows seamless integration into your marine electronics ecosystem, providing broader coverage and redundancy for reliable operation on extended voyages. Experience the difference in target separation and bottom tracking that Chirp technology brings, far surpassing traditional fixed-frequency sonar.

Unmatched Chirp Performance for Every Condition

Harnessing advanced Chirp technology, these transducers sweep across wide frequency bands—40-75 kHz for low and 80-130 kHz for medium—adapting dynamically to water depth and conditions. This results in sharper images, even in murky waters or at high speeds.

• Adaptive Beamwidth: Low-frequency beam narrows from 32° to 21° as depth increases, maximizing resolution at all ranges.
• Medium-Frequency Precision: 24° to 16° beamwidth excels at identifying structure and bait schools in mid-depths.
• 600W Power Handling: Robust output for penetrating deeper waters without signal loss.
• Integrated Temp Sensor: Accurate water temperature readings to correlate with fish behavior and navigation data.

Bronze construction resists corrosion in saltwater environments, ensuring longevity and consistent performance season after season.

Streamlined Installation for Professional Results

Installing these thru-hull transducers is straightforward for DIY enthusiasts or pros alike. The 0-degree design suits flat or low-deadrise hulls, minimizing air entrainment and cavitation. Each unit features a CP450C plug, and the included Y-splitter cable simplifies wiring to your Raymarine sounder or multifunction display.

Pro Tips:

• Position forward of props and keels for clean water flow.
• Use marine sealant around the thru-hull fitting to prevent leaks.
• Pair with standard 2-inch thru-hull holes—no hull modifications needed.
• Test alignment post-install to confirm vertical orientation using your sounder's calibration tools.

This pair configuration supports high/low frequency splitting, ideal for multibeam setups on larger vessels.

Why Boaters Trust This Transducer Pair

Boat owners rave about the enhanced clarity these transducers provide during offshore adventures or inland fishing. The Chirp sweeps reveal subtle bottom contours, wrecks, and schools that narrower beams miss. In real-world scenarios, anglers report better hookups thanks to precise fish arching, while cruisers benefit from reliable shallow-water alerts.

Compared to in-hull alternatives, thru-hull mounting eliminates signal attenuation through hull material, delivering raw power directly into the water column. For wood hull owners, the bronze flange ensures a secure, vibration-free fit.

Versatile Applications Across Vessel Types

Perfect for sportfishing boats, yachts, and sailboats with fiberglass or wooden hulls. Use the low band for deep-water structure scanning up to hundreds of feet, and switch to medium for detailed mid-range views. The pair enables simultaneous operation, boosting your chartplotter's RealVision or SideVision modes for panoramic underwater awareness.

Long-Term Reliability and Maintenance

Built to withstand harsh marine conditions, routine care keeps them performing like new. Wipe the face clean after use to remove growth, inspect cables for wear annually, and store your vessel with transducers retracted if possible. Their durable design means fewer replacements and more time on the water.