Also called sidechain resonators. They work best when the side chamber is actually dampened, like using one of those vibrant resonators in parallel. Theoretically you should be able to cancel out a specific frequency but in testing they don't seem to work that way. Don't know if it's a size thing or what. Synapse Engineering had a selection of sidechain resonators and in testing they found that cramming in the biggest resonator you could had the biggest effect. All the math of resonant wavelengths didn't really change anything. On my formula car we have two vibrant resonators in parallel, and cap one to drop ~4db.
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