Formal on the outside, fun on the inside Made with hand-assembled, sustainable materials, the Apos Caspian is an open-back headphone that looks timeless and sounds thrilling. The sound We designed the Caspian to make you smile--not to be used as a microscope for analyzing every last detail. The bass is playful yet controlled, alive and extended with visceral rumble. The midrange is compelling, with a focus on realism and immersion. For the high-end, we wanted all the airiness and sparkle of a quality treble experience--without the fatigue. To get there, we introduced a series of dips between 2K and 7kHz that protect sensitive parts of your hearing from fatigue. 50mm Kennerton dynamic driver: a tamed beast Capable of producing a vast range of bass frequencies with minimal power requirements, the 50mm driver is a real beast. But beasts have to be tamed or else, in this case, they bleed all of that bass energy into the mid-range, creating a muddled, awful experience. We started with an extremely low-mass driver. Low-mass drivers respond quickly to signals and minimize decay time, resulting in a realistic sound. Then we mechanically decoupled the driver from the wooden housing, which decreased the total harmonic distortion. After that, we added a lightweight graphene layer to the diaphragm to boost rigidity, decrease distortion, and improve speed and decay. Finally, our engineers tuned the driver for an enveloping full-spectrum experience. Easy to drive We created the Caspian so that you can drive it without an amplifier. At 115dB per 1mW power, it plays from most phones and laptops. Hand-stitched sheepskin ear pads We started with an inch-deep pad of acoustic memory foam and wrapped it in soft hand-stitched sheepskin leather. The look is plush, elegant, and luxurious, like the upholstery of a high-end sports car. We made them oval-shaped to accommodate a variety of ear shapes and sizes.