One of the most interesting and unusual aspects of this earphone involves a small screw on each enclosure. Using the supplied screwdriver-cum-earwax remover (not a tool we get to write about often), you can turn the screw to increase or decrease bass intensity to your liking. We'll come to this again later.
The Sennheiser IE 8 kit comes with various tips and a screwdriver-cum-earwax remover
Inside, and unlike the competing Shure SE530s and Ultimate Ears triple.fi 10s, the IE 8s use just a single dynamic speaker driver instead of the aforementioned models' use of three. Sennheiser believes such designs offer wider frequency response ranges, lower distortion at higher volume levels and a greater resistance to damage from knocks and bumps.
These drivers deliver a frequency response between 10Hz-20kHz, with a sensitivity of 125dB/mW and a low impedance of 16Ohms, making them suitable for all portable players. No extension cable or 6.3mm adaptor is included, which, considering the price and competition, is a bit poor (pun intended).
- See more at: http://www.sound-bd.com/brand-new-sennheiser-ie-8i-headphones.html#sthash.RmZ4SSBK.dpuf