If a transducer acoustic element has a problem then it can fail to resonate correctly and output low power.
Surface Filter (Noise Filter, TVG): Manual, 0%. Intensity (Contrast, Colour Gain): Manual, 15% (again, make sure you're not still in Auto). 
Gain: Manual, 65% (if you only see -50% to +50% you're still in Auto, make sure you untick the Auto box at the bottom of the gain slider).
In Adjust Sensitivity, please set exactly the same Sensitivity and display configuration on each sounder channel, as below:. Please set up overlays for SOG, Vessel Position and Depth (so that we can see how fast you were going and from a chart, what the correct depth ought to have been compared to what the system is measuring) From your newly-configured fishfinder page, Menu > Settings > Page settings > Edit data overlays. The idea is to compare the results from the two channels (frequencies.) If you have an RV system, Sonar and Downvision would be good. First, please set up a sounder page with at least two sounder channels displayed (for example, if you have a CP470, a two-way split with both Low Chirp and High Chirp at the same time would be great. It doesn't take a lot of either sound or electrical noise to start to cause problems. If you imagine the amount of energy contained in a sound echo coming back from a single fish 100m down, or the bottom 500m or more down, and then picture that echo moving the transducer element and that movement then inducing a voltage onto the signal cable, I think that gives a bit of an idea of the low level of the electrical signals on the transducer cables, which can be less than 0.00001V. Every electronic system contains noise (unwanted randomly fluctuating voltages in parts of the circuit) to some degree, and both the sea and boats are relatively noisy places so there will always be a background noise level: the sounder needs to be able to clearly hear the echoes from fish and the bottom above this noise. What a sounder needs in order to perform well - some backgroundĪll sounders, of whatever brand, require as large as possible a difference in the signal level (voltage on the transducer cable) and the background noise level.
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