From the press release "optimized 7 mm- transducers and innovative X3R resonator chamber technology to the precision-manufactured aluminum housing"
https://en-us.sennheiser.com/ie-900?syz_chnl=001&gclid=CjwKCAjwnPOEBhA0EiwA609ReSCo1Xd8p9H3P6OCJpimkmY5lGNFLUQmYA5_kcONdj2ZKIiEVJDUvBoCAKYQAvD_BwE
Actually, that graph that shows how what each helmholtz resonator does to the FR is interesting. The page is surprisingly sprinkled with info amidst the ad-hype.
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