The X5 is a slightly larger—by only 2mm in diameter—than the flagship X10, so it’s easier and somewhat less expensive to manufacture, so we can pass the savings on to the end user. However, the X5 is still considered a very small, lightweight design and will continue the Image legacy of being the least fatiguing in-ear headphones around.
With respect to technology and sound performance, the X5 employs a balanced full-range driver with a tuned bass-reflex system, while the X10 uses an exclusive full-range micro-driver with a tuned bass-reflex system. If you like a lot of bass, we recommend purchasing the X10; however, if you like want a superior top end with more forward voicing than the X5 is the right choice for you.
According to the Klipsch engineering team, the X5 continues Klipsch’s sound signature by performing accurately in the frequency and time domain, minimizing any phase distortion with its linear acceleration. As a result, you’ll hear things in your favorite recordings you never noticed before.
Read a review that compares the X10 and the X5.