Regarding hum...
Look at it:
The transducer is not even "in" the chassis. I expect the other transducer is the same on the other side? This and the unshielded leads to those transducers will surely pick up a lot more EMF than the tank you purchased (which has transducers fully inside a metal enclosure) and your use of shielded leads to connect it. I expect this to result in less hum but I guess that all depends on the actual cause of the hum. Which may or may not be EMF on the transducer circuits. But most likely is.
Look at it:
The transducer is not even "in" the chassis. I expect the other transducer is the same on the other side? This and the unshielded leads to those transducers will surely pick up a lot more EMF than the tank you purchased (which has transducers fully inside a metal enclosure) and your use of shielded leads to connect it. I expect this to result in less hum but I guess that all depends on the actual cause of the hum. Which may or may not be EMF on the transducer circuits. But most likely is.
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