FiiO FH7S in-Ear Earphones High-Performance 1DD+4BA Hybrid Technology IEM Earbuds with 3.5/4.4mm Plug [Hybrid IEM's, 4BA+1DD]: FiiO’s new hybrid IEMs, the FH7S earphone 1 dynamic 4 BA driver design features a 2nd generation 13.6mm DLC diaphragm dynamic bass driver fully capable of extending to the lowest frequencies with ample punch. Mid and high frequencies are handled by a custom 4 Knowles BA setup that accurately reproduces every last musical detail. Together, these drivers provide a rich and detailed musical soundscape. [Sci-Fi armor design]: The FH7S features a design resembling that of armor seen in sci-fi, futuristic weaponry and machinery. the FH7S still retains an overall rounded shape that perfectly fits the human ear for comfortable extended listening sessions. [2nd-gen semi-open design]: The result is that when the drivers push air when making sound, that air encounters less resistance - resulting in a smoother yet detailed sound, natural timbre, large soundstage, and pinpoint accurate imaging. [Patented S.TURBO acoustic design]: The FiiO FH7S features the patented S.TURBO acoustic design*, which allows for deep bass that maintains plenty of nuance and texture. Sound waves are carefully guided through a turbine-shaped tube to enhance bass frequencies so that sounds like the beating of drums are appropriately thunderous and bold. [Debuting the all-new FiiO HS18 silicone ear tips 0.4mm]: new ear tips feature a large opening, same as the size of the FH7S sound tube, to minimize sound barriers between the earphone and the eardrum – which reduces high frequency loss and further enhances resolution. Large 13.6mm DLC dynamic driver The diaphragm of the FH7S dynamic driver is made of DLC (Diamond-Like Carbon). Due to its highly damped nature, high rigidity, and light weight the dynamic driver is capable of rapid transient response – further adding to the sensation of dynamic bass that you will truly remember. 4 exclusively customized Knowles BA drivers By adjusting the air permeability of the midrange drivers, it leads to a more natural, distinctive and smoother connection between bass, mids and highs. Meanwhile, vocals are clearer and more captivating with just-right richness. The high frequencies are produced by the Knowles SWFK-31736 BA driver with its high resonant frequency. The driver contains richer highs details and airiness while also helping to further enhance the size of the soundstage, which is relaxed and comfortable to listen to. 2nd-gen semi-open design The result is that when the drivers push air when making sound, that air encounters less resistance - resulting in a smoother yet detailed sound, natural timbre, large soundstage, and pinpoint accurate imaging. Unique notch filter technology Using finite element analysis and after numerous experiments, the development team created a unique notch filter for the FH7S. The notch filter precisely guides sound waves to eliminate unwanted resonances between the shell, sound tube, and ear canal to suppress undesirable sibilance - resulting in a detailed, transparent yet unfatiguing sound. Patented S.TURBO acoustic design The FiiO FH7S features the patented S.TURBO acoustic design*, which allows for deep bass that maintains plenty of nuance and texture. Sound waves are carefully guided through a turbine-shaped tube to enhance bass frequencies so that sounds like the beating of drums are appropriately thunderous and bold. Comfort from 0.4mm These new ear tips feature a large opening, same as the size of the FH7S sound tube, to minimize sound barriers between the earphone and the eardrum – which reduces high frequency loss and further enhances resolution.