A90 Discrete NFCA Headphone Amplifier Preamplifier 6.35mm/4.4mm Balanced/4-Pin-XLR Headphone Output R2R Relay Volume Control (Silver)

Fully discrete NFCA also create wonderful amp A90 Discrete uses fully discrete components to redesign the NFCA (Nested Feedback Composite Amplifier) module. 4 built-in NFCA-Discrete modules which each them uses 39 transistors build up fully balanced structure. The optimized Voltage Current hybrid feedback architecture along with UHGF (Ultra High Gain Feedback) technology provide excellent DC and AC performance.; High output voltage, high current, low output impedance, no headphones that can't be dealt withHigh output voltage can easily drive high impedance headphones; High output current allows low-sensitivity headphones to obtain enough power; The low output impedance will not bring unnecessary effect on FR when driving low-impedance headphones.

Different headphones can be easily driven by the A90 Discrete.; 2 Gain settings The A90 Discrete has two gain options, which are enough to cover a wide variety of headphones: low gain to drive the IEMs with high sensitivity, and high gain to drive full-sized over-ears. Combined with the 0.2 uVrms ultra-low noise, even sensitive lEMs will not suffer from any noise.; Ground Loop Noise Terminator Ground loop noise may be encountered when multiple devices are used in combination. A90 Discrete adds a GND/LIFT switch to solve this problem. When in normal use, set it to GND; and when ground loop noise is encountered, switch it to LIFT. Then the ground loop noise is eliminated.; A Headphone Amp, also a Preamp When it is in preamp