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Duotone bay — asphalt brief on the left, yellow-folded service sheet on the right.
Octa/Quad/Double/Single-Speed
weight: 52 lbs
Eight cutting-edge multi-technology drivers including Sonion electrostatic
The B30 earphones offer a frequency range of 15 Hz to 18 kHz with a sensitivity of 107 dB
Acoustically transparent
Audio-Technica ATH-CKR9 In-Ear Headphones (Open Box) - Discontinued American brand Octa/Quad/Double/Single-SpeedATH CKR9 Featuring the worlds first dual phase push pull driver system, the ATH CKR9 in ear headphones deliver amazingly clear, high resolution audio. The unique push pull system incorporates two 13 mm drivers that face each other, but are wired out of phase, providing lower harmonic distortion and improved damping and bass frequency control. Machined aluminum housings reduce unwanted resonance for crisp mid and high range audio, while a stainless
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