Simrad xSonic Airmar B45 Bronze Thru-Hull Transducer, 9-Pin, 50/200 kHz, 600W, Depth/Temp, With Fairing Block, 10m Cable
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Overview
The Simrad 000-13946-001 is a bronze thru-hull transducer that outputs traditional 50/200 kHz sonar plus water temperature through a 9-pin xSonic connector. It is rated at 600 W RMS, with a 45° beam at 50 kHz and a 12° beam at 200 kHz for switching between wider coverage and tighter detail.
Maximum depth performance is listed up to 1,200 ft at 50 kHz and up to 700 ft at 200 kHz, depending on bottom type and water conditions. The cable length is 10 m (33 ft), which helps when you need to reach a helm-mounted display on a center console or run through a rigging tube on a sailboat.
This is a stem-style thru-hull install that uses a fairing block for clean water flow and supports hull deadrise up to 26°. It is specified for fiberglass or wood hulls, and it reads both depth and temperature for everyday navigation and fishing.
Key features
- Traditional dual-frequency sonar: 50/200 kHz, 600 W RMS
- Beamwidth: 45° at 50 kHz and 12° at 200 kHz
- Depth performance listed up to 1,200 ft (50 kHz) and up to 700 ft (200 kHz)
- Fast-response water temperature sensing with ±0.2°C accuracy
- Bronze housing with urethane acoustic window for a thru-hull installation
- 22 mm (7/8 in) hole size; usable shaft length 92 mm (3.62 in)
- 10 m (33 ft) cable with 9-pin (Simrad/Lowrance/Navico) connector
- Fairing-supported installation for hull deadrise up to 26°
Compatibility and fit
This transducer connects to Simrad sonar inputs that use the 9-pin xSonic transducer port and support traditional 50/200 kHz, 600 W depth and temperature transducers. Your display or sonar module handles the frequency selection and interprets the depth and temperature data.
The bronze housing is specified for fiberglass or wood hulls. On aluminum or steel boats, a housing intended for metal hulls is typically used to manage corrosion concerns.
Installation and setup
Plan on a 22 mm (7/8 in) thru-hull hole and pick a location where the transducer stays in clean water flow, away from strakes, steps, and turbulence that can cause dropouts at speed. Inside the boat, make sure you have access to tighten the stem nut and route the cable without sharp bends.
With a fairing block the installation supports hull deadrise up to 26° and helps keep aerated water off the face. After launch, check the thru-hull for leaks and re-check again after the first run.
On-water sonar use
50 kHz runs a wider beam that reaches deeper water, which can help when you are offshore or crossing steep bottom changes. 200 kHz tightens the beam for a cleaner bottom trace and better target separation in shallower water.
This setup makes sense for smaller planing hulls and cruising sailboats where you want steady depth and a quick temperature readout for navigation, coastal cruising, and fishing.
Maintenance and care
Keep the transducer face clear of heavy growth and avoid aggressive scraping that can damage the acoustic window. If you apply bottom paint, use a transducer-safe antifouling and keep coatings off the active face unless the coating is specifically intended for transducers.
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