The CX880i is a new model from Sennheiser that includes an i-thing remote control in the lead and a microphone too, so you can make and receive phone calls via your mobile hi-fi . The earpieces quote an unusually wide frequency range, right down to 17Hz – we've no reason to question that, though every time we look at a headphone frequency response specification we are reminded how far ahead of most loudspeakers even quite modest headphones are in that particular respect.



Link: Techradar