Fir Audio Project K UIEM Brand_Plussound By removing damping material that

By removing damping material that had been characteristic to HD600 and HD650's design – and bass shortfall – Sennheiser were able to lower the resonant frequency of HD660S2's driver from 110Hz to 70Hz

where the planar driver shines by delivering exceptional resolution and emotional engagement

but neither is anyone surprised by the excellence of Lina headphone amplifier anyway

dynamics and full musical immersion follow you on your journey to audio nirvana

Fir Audio Project K UIEM Brand_Plussound By removing damping material thatLaunched this Canjam Singapore (2025), the Project K is encased in sapphire glass faceplate and a titanium shell, exquisitely small enough to fit most ears. For FIR Audio, the Project K is the pinnacle of audio technology, and the sound they'll be proud to present. Lush and full, the Project K gives more than its size, and allows for long hours of easy listening without shrilly peaks. Working with global top artists like Billie Eilish, Sabrina