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The noise is really bugging me too, way too noisy for my liking.
I think the noisiest part of the tank will be in the motor housing, those motors look especially noisy to me too.
I'm thinking some kind of liquid product that I could inject around
the motors that sets to a solid foam would absorb the sound.
The problem would be if anything needed replacing, it'd mean cutting the sound proofing out with a carving knife but the benefit of a quieter DTR would outweigh that problem a million times.
Around the worm gear area I'd stick draught proofing tape OSLT to the walls to absorb the sound from those too.
If I'm right even a few small strips stuck in there will cut the noise down a little.
The only other solution I can find is finding quieter motors, a job I'm not prepared to take on.
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