{"product_id":"airmar-tm258-1kw-transducer-humminbird-9-plug-transom-mount","title":"Airmar TM258 1kW Transducer Humminbird #9 Plug Transom Mount","description":"\u003ch2\u003eOverview\u003c\/h2\u003e\n\u003cp\u003eBuilt for anglers running older Humminbird systems or upgrading from standard transom transducers who want dramatically better sensitivity and high-speed performance without replacing their entire sonar unit. If you're pushing 20+ knots and your transducer is giving you weak target definition or missed structure, this is the upgrade that changes everything on the water.\u003c\/p\u003e\n\u003cp\u003eThe TM258 is a 1kW transom-mount transducer that makes your existing 600W sounder perform like a much more powerful system. You get 16 times the sensitivity of a standard transducer, dual-frequency operation (50 kHz\/200 kHz), and a streamlined design built to track clean and stable up to 30 knots. This transducer fits directly into existing TM256 and TM258 mounts, so installation is straightforward on boats up to 40 feet.\u003c\/p\u003e\n\u003ch3\u003eKey Features\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003e1kW Power Output\u003c\/strong\u003e — boosts 600W sounders to near-professional sensitivity — you'll see smaller baitfish, suspended targets, and bottom structure with crisp detail instead of weak gray marks.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e16x Sensitivity vs. Standard Transom Mount\u003c\/strong\u003e — dramatically improves target separation and clarity — the difference between guessing where fish are and knowing exactly what's beneath you.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eDual-Frequency Elements (50 kHz\/200 kHz)\u003c\/strong\u003e — four elements focus narrow beams at both frequencies for fine target definition — wide coverage at 50 kHz finds structure; tight 200 kHz beam locks in hard bottom and small targets.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eElliptical Beam Pattern\u003c\/strong\u003e — covers a larger bottom area in a single sweep — you scan more water column in less time, critical when running fast between waypoints or working shallow flats.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eHigh-Speed Performance to 30 Knots\u003c\/strong\u003e — sleek, streamlined housing minimizes turbulence and cavitation — stays locked on bottom and structure even when you're running hard between spots.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eIntegrated Depth and Temperature\u003c\/strong\u003e — built-in sensors give you real-time water data — temperature helps you identify thermoclines and seasonal patterns without a separate sensor.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eKick-Up Bracket\u003c\/strong\u003e — locks in the up position and won't damage your transom if you hit shallow bottom — designed for practical boat use, not just smooth water.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eSpecs \u0026amp; What's Included\u003c\/h3\u003e\n\u003cp\u003e\u003cstrong\u003eCompatibility:\u003c\/strong\u003e Connects to any Humminbird sounder with a #9 7-Pin connector. Works on boats with transom angles between 3° and 21° and hull deadrise up to 25°. Fits existing TM256 and TM258 mounting brackets directly. Not sure if this works with your setup? Call or text us at (833) 831-4077 — we'll tell you straight.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eWhat You Get:\u003c\/strong\u003e The TM258 transducer with updated mounting bracket, cable, and connector. Your Humminbird display and transducer cable are not included.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eSpecifications:\u003c\/strong\u003e 1kW output, 50 kHz\/200 kHz, urethane housing, weighs 7.9 lbs. Rated for boats up to 40 feet.\u003c\/p\u003e","brand":"Airmar","offers":[{"title":"Default Title","offer_id":45764309712953,"sku":"65247","price":1197.91,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0729\/2685\/5225\/files\/65247XL.jpg?v=1777401413","url":"https:\/\/www.depthsource.com\/products\/airmar-tm258-1kw-transducer-humminbird-9-plug-transom-mount","provider":"Depth Source","version":"1.0","type":"link"}