Audiophilepure

https://www.headfonia.com/fir-audio-project-k-review/

Of course, FIR also uses their ATOM Venting system for pressure relief and isolation control. Project K comes with the Gold (+2dB/-17dB) module preinstalled. There are no extra XS modules supplied. The Gold (+) module lowers isolation to -17 decibels. It has a rated impedance of 15 Ohms and a frequency response range of 20Hz to 20kHz. FIR uses premium silver internal wiring for the drivers and components.

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