Audio-Technica ATH-CKR90iS In-Ear Headphones (Open Box) - Discontinued xlr-4 male A four-function switch filter offers

A four-function switch filter offers a useful degree of user-selectable frequency-shaping

4 Knowles Drivers and 2 Sonion Drivers each side

5U4G vacuum tube x 2

Subtle reproduction of low-frequency tone-arm resonance

Audio-Technica ATH-CKR90iS In-Ear Headphones (Open Box) - Discontinued xlr-4 male A four-function switch filter offersAudio technica ATH CKR90iS Earphones Featuring dual phase push pull drivers of different diameters (13 mm and 10. 4 mm), the Audio technica ATH CKR90iS Earphones deliver amazingly clear Hi Res Audio. In the unique push pull system, the drivers face each other, but are wired out of phase, providing lower harmonic distortion and improved damping and bass frequency control. The use of drivers with different diameters improves high frequency response. The