Raymarine B175L Bronze Low Profile 1000W D/T Thru-Hull Transducer 12-Degree AngleB175 low profile, CHIRP ready transducers are designed for high speed applications such as center consoles. The B165 can be used individually or in pairs with Raymarine CHIRP sonars. The B175L transducer has up to 20 kHz of total bandwidth and transmits across 40 to 60 kHz bands. The CHIRP low frequency band is a deep water performer delivering excellent coverage and tracking. The B175M CHIRP medium frequency version operates at a frequency range of