Sony XBA-H1 In-ear Headphones with Hybrid Driver System. The Sony XBA-H1 In-ear Headphones have been designed in collaboration with Sony Music Entertainment, the XBA-H1 in-ear headphones let you hear music the way musicians intended. Hear detailed sound reproduction across the full frequency range thanks to a hybrid 2-way driver unit with built-in Beat Response Control technology, you'll be able to bump up the bass without worrying about distortion. Enjoy flawless reproduction of mid and upper levels, thanks to the Balanced Armature driver units and hear your music and nothing else, thanks to the close fit and closed earbud design.They may be small, but when it comes to bass response these headphones really pack a punch. The expanded frequency range - 5Hz at the low-end - allows the headphones to pick up on those sub-bass notes that others miss, while the closed-back, close-fitting earbud design maximises the bass signatures in your music. Coupled with a hybrid driver and Beat Response Control systems, you'll hear tight, rhythmic handling of even the toughest bass lines. And buy this Sony XBA-H1 In-ear Headphones with Hybrid Driver System Was £84.00 Now £64.00.