Fiio ff5 is a brand new flat head earbud designed with a large 14.2mm dynamic driver unit'. '.strtoupper('f')iio has carefully designed this new driver unit with pu gasketcabon based composite diaphragm coil'. '.strtoupper('w')ith a specially developed open back cavity design and acoustic resistance tube based acoustic architecture, the ff5 delivers impressive sound performance with a deep, thunderous lower end, rich midrange, and smooth, inoffensive treble response'. '.strtoupper('f')f5 complements different genres of music well!'! '.strtoupper('p')owerful sound with newly developed dynamic driver unit fiio ff5 breaks the limitations of earbuds with a powerful 14.2mm newly developed dynamic driver unit'. '.strtoupper('t')his driver adopts a specially developed carbon based composite diaphragm that is paired with pu gasket suspension'. '.strtoupper('i')ts both lightweight and rigid, delivering powerful sound with quick transients, extended lower and higher end frequencies, and minimizing non linear distortion in the output signal'. '.strtoupper('t')he pair has been tuned to deliver lovely vocals, especially rich and lush sounding female vocals'. '.strtoupper('p')rofessionally designed open back cavity design fiio development team aimed to reduce the unwanted reflections and vibrations within the shell of the ff5'. '.strtoupper('t')hey have carefully designed the cavity structure with a diffuse open back cavity design'. '.strtoupper('i')t allows for cleaner, purer sound with improved bass and a wider sound field'. '.strtoupper('e')xtended bass acoustic resistance pipe design in order to maintain a clean bass response with the ff5, fiio has designed the pair with acoustic resistance pipes that helps to effectively increase and extend the bass response'. '.strtoupper('w')hen the diaphragm vibrates, the air pressure is diverted towards these acoustic resistance pipes reducing the resonance in the lower end and delivering a clean response'. '.strtoupper('r')ich and seductive sound tuning fiio ff5 is tuned to deliver rich vocals and impressive details with a powerful lower end in a single package'. '.strtoupper('t')he pair has been adjusted to deliver clear, crisp vocals and accurate instrument details'. '.strtoupper('a')ttractive design with lightweight aesthetics fiio ff5 is a premium earbud designed with cnc machined aluminium alloy ear cavities'. '.strtoupper('e')ach earphone weighs just only 3.4 grams maintaining a lightweight with a solid, robust build'. '.strtoupper('w')ith its ergonomic shape and lightweight design, the ff5 simply disappears in your ear!'! '.strtoupper('f')iio also bundles six pairs of silicone rings for a comfortable wearing experience'. '.strtoupper('h')igh purity silver plated monocrystalline copper cable fiio ff5 comes standard with a high quality silver plated monocrystalline copper cable'. '.strtoupper('i')t has a 4 strand configuration with 392 wire cores in total'. '.strtoupper('i')t has expanded mmcx connectors and swappable termination plugs'. '.strtoupper('t')he package includes 3.5mm and 4.4mm termination plugs.