Re: transducer mounting location
Acoustics is everything when a transducer sounding performs as designed. There is no better method than unobstructed direct contact with the water to expect a transducer sounding to operate as the factory has "speced". When referring to "shoot-through" transducer installations, fiberglass or wood will absorb the transducer sound vibration emitted by a transducer, therefore, compromising or even eliminating the effectiveness of its sounding performance. An acoustic medium, such as epoxies we see frequently used to "stick" the transducer in place on the interior side of the boat hull, actually compromise the sounding even further by causing the "shoot-through" hull area to become more dense regardless of the hardness of the medium. Boat hull materials built of aluminum and other metals are also dense and reverberate an echo out of tune with the pulsations of your transducer causing erratic feedback, thus the reason why "shoot-through" installations in aluminum boats are ineffective. The transducer must receive the same rhythm it emits.
