Airmar B175 Tilted Element
One housing, three frequency bands — High, Medium, and Low. The right pick comes down to how deep you actually fish, not which one sounds the most premium.
Same tilted-element housing, three tunings — lower frequencies throw a wider cone and reach deeper; higher frequencies narrow the beam for sharper detail close to the boat.
One Housing, Three Bands
Same element, different tuning
Every B175 is built around the same piece of engineering: a ceramic element cast into a bronze, low-profile housing at a fixed tilt, so the beam still points straight down once it's mounted to a hull with deadrise. Installation, housing, and mounting don't change from one B175 to the next.
What changes is frequency, and that's the choice that actually matters once the transducer's in the water. Lower frequencies push deeper but return coarser detail through a wider cone; higher frequencies sharpen the picture and narrow the beam, at the cost of range. Airmar doesn't try to split the difference in one unit — the B175 comes in three single-band versions, and the job is picking the one that matches how you fish.
The Three Bands
High, Medium, and Low — side by side
Trades resolution for penetration. Keeps bottom contact on canyon drops, deep wrecks, and tilefish grounds where the other two bands lose the bottom entirely.
Best for 1,000–3,000+ ft
Widest beam, coarsest detail
The versatile middle ground. More depth than the High, better resolution than the Low — covers most everyday inshore-to-offshore fishing without compromise.
Best for 0–1,000 ft
Balanced beam and detail
Airmar's best-selling single-band B175. Sharp target separation and bottom detail from the surface down through mid-offshore depths.
Best for 600–800 ft
Narrowest beam, sharpest detail
Each B175 ships as a single band — there's no version that covers all three ranges at once. Anglers who genuinely split time between deep canyon trips and shallow inshore water tend to end up running two transducers rather than asking one to do both jobs.
Before You Drill
The same install notes apply to all three
- Bronze housing, bronze rules. Fine on fiberglass, wood, or steel. Never on aluminum — it'll set up galvanic corrosion at the hull.
- No fairing block in the box. If the boat regularly sees 25–30+ mph, plan to add one regardless of which band you choose. Turbulence at the face is what kills high-speed readings, not the frequency.
- Mind the protrusion. The element needs to sit roughly 0.5–1.5 inches below the hull so it stays wetted once the boat's up on plane.
- Skip the silicone. Bed it with a proper marine sealant — Life-Calk or equivalent. Silicone isn't rated for below-the-waterline service.
- Connector comes in two flavors. Order an OEM plug matched to your fishfinder, or go Mix & Match with a universal cable and a separate brand adapter — useful if a head unit swap is in your future, on any of the three bands.
The Tally
Where the lineup earns its keep, and where it doesn't
Pros
- One housing design across all three bands — switching frequency later doesn't mean relearning the install
- 1 kW CHIRP-ready output in every band, not just the flagship High
- Bronze housing built for the long haul on fiberglass, wood, or steel hulls
- Mix & Match cable option lets the housing outlive a fishfinder upgrade
- Broad connector support across Garmin, Raymarine, Humminbird, Navico, Furuno, and more
Cons
- Single-band only — no B175 covers deep canyon and skinny flats at once
- Bronze housing is a flat no for aluminum hulls
- Fairing block is a separate purchase — easy to forget until speed noise shows up
- Picking the wrong band means living with a coverage gap until you replace the unit
Bottom Line
Buy the band you'll actually use
The B175 isn't one transducer trying to do everything — it's three, built around the same tilted-element housing so installation and reliability don't change no matter which you pick. Go Low if your trips run to canyon and wreck depths, Medium if you want one transducer that covers most situations without thinking about it, and High if you're fishing inshore and nearshore where detail matters more than reaching three thousand feet down. Match the band to where you actually fish, not the spec that sounds the most impressive.