When you click on links to various merchants on this site and make a purchase, this can result in this site earning a commission. Affiliate programs and affiliations include, but are not limited to, the eBay Partner Network.
true. Most acoustic resonator style sound cancellation techniques are "tuned"
And this is why in cars helmholtz resonators are typically only used in intakes to kill resonant drones due to the particulars of their piping, and are used in power generator setups (which run at a fixed RPM).