Electrostatic earphone system consists of single-driver, electrostatic earphones matched to a digital-to-analogue-converter with EQ control. Features audio playback settings and electrostatic technology, the most precise transient response available. Electrostatic earphone system consists of single-driver, electrostatic earphones matched to a digital-to-analogue-converter with EQ control. Features audio playback settings and electrostatic technology, the most precise transient response available. The KSE1500 is based on state-of-the-art electrostatic technology. Each single MicroDriver Sound Isolating electrostatic earphone features a virtually weightless, massless diaphragm, surrounded by an electrostatic field generated by back plates that manage charge oscillation. This technology provides the fastest, most accurate transient response available resulting in unmatched audio clarity and detail. KSE1500 is capable of processing digital audio via micro-USB as well as analogue audio via direct line in. It can also bypass entirely for a pure analogue signal without conversion. The featured USB digital-to-analogue-converter (DAC) converts analogue or digital audio from portable sources and computers.