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  • It really should be too hard of a design. A muli-channel design would be difficult to setup, but 4 single units with a single speaker each should work (in theory).Id start with the a junk pair of noise cancelling head phones, or other noise cancelling device. Then pull out the circuit for the noise cancelling. Hot glue the mic to the offending noise maker and then the output into a amplified speaker.It may take some tweaking, but as each noise source is lowered, the overall sounds in the car will lowered. Again, in theory this is a possible way for it to work. Using other components and reworking / re-purposing them doesn't mean it wont work. It might not work well enough, But its a start. I just check goodwill, value village, and yard sales until I find something that has possibilities...see more »It really should be too hard of a design. A muli-channel design would be difficult to setup, but 4 single units with a single speaker each should work (in theory).Id start with the a junk pair of noise cancelling head phones, or other noise cancelling device. Then pull out the circuit for the noise cancelling. Hot glue the mic to the offending noise maker and then the output into a amplified speaker.It may take some tweaking, but as each noise source is lowered, the overall sounds in the car will lowered. Again, in theory this is a possible way for it to work. Using other components and reworking / re-purposing them doesn't mean it wont work. It might not work well enough, But its a start. I just check goodwill, value village, and yard sales until I find something that has possibilities. Just remember you will need a small amplifier to increase the output of a small noise cancelling circuit. It by itself wont have the power to be noticed in a noisy car.

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