Sennheiser PXC 550 Pros&Cons Pros  Great noise-cancellation Comfortable Good sound Interesting features Long battery-life Cons  A bit pricey Somewhat questionable design elements Dodgy Bluetooth pairing Sennheiser PXC 550 Specs Impedance: 46Ω (Passive) / 490Ω (Active) Frequency response: 17Hz ~ 23kHz SPL: 110dB Connectivity: Wired / Bluetooth 4.2 Charging time: 3 hours Playback time: Up to 30 hours Weight (w/o … Continue reading Sennheiser PXC 550 Wireless Headphones Review