• The JT7 is only 318g, much lighter than typical planar magnetic headphones, making it less burdensome even during long listening sessions, allowing you to use it comfortably at home or on the go Moreover, the foldable design makes it easy to store and carry in your bag It has a compact design that you wouldn't expect from an over-ear type • The 95×86mm planar magnetic driver installed in the JT7 has been consistently designed by FiiO from the development of the diaphragm to the control of the voice coil and magnetic circuit, ensuring that the sound that the brand seeks is controlled down to the finest detail The large planar magnetic field diaphragm achieves a vast sound stage and a powerful bass expression ※The planar magnetic type is different from conventional dynamic or balanced armature types, driven by electromagnetic force acting on the entire surface of a lightweight and thin diaphragm This ensures uniform force is applied across the entire diaphragm, physically eliminating almost all of the divided vibrations commonly found in dynamic types As a result, low distortion, excellent transient performance, and a vast sound stage are achieved It may be expensive due to complex manufacturing techniques, but it is an acoustically beneficial design method • For the planar vibration plate to fully exhibit rapid vibration and delicate response characteristics, sufficient thinness is required The JT7 diaphragm is only 3μm thin, and accurately responds to even the smallest changes in electrical signals This provides excellent transient response characteristics and clearly reproduces high-frequency signals • JT7 diaphragm uses a unique elastic auxiliary system "F.E.S." (FIIO Elastic System) This is a driver diaphragm design that incorporates multidimensional texture on the surface by applying the edge processing of the dynamic driver to increase the elasticity of the diaphragm F.E.S. provides more precise internal stress control than common flat drivers, allowing the driver to move more freely without increasing distortion As a result, it delivers powerful and impactful bass ※F.E.S. (FIIO Elastic System): A proprietary elastic assistance system designed by adding a new deformation vector to a planar film to increase the movement of the driver, allowing the diaphragm to build the elastic force to counteract internal stress • The JT7 has a high sensitivity of 92dB/mW due to the powerful magnetic field generated by high-performance bi-directional neodymium iron boron magnets These magnets provide robust and sufficient driving force to planar drivers, bringing out a large and rich sound even from small output audio devices