The A90 Discrete adopts fully discrete components to reinvent the Nested Feedback Composite Amplifier module. It features 4 built-in NFCA-Discrete units with thirty-nine transistors each, forming a completely balanced architecture. The optimized Voltage-Current blended feedback architecture, along with UHGF technology, provides superior DC and AC performance. Thanks to the new design, the amp has a stronger output power, allowing it easy to drive low impedance headphones effortlessly.
Two Gain Options: The Enhanced A90 provides dual gain options, suitable for a wide range of headphones: reduced gain for high sensitivity IEMs, and high gain for full-sized over-ears. Combined with the ultra-low 0.2uVrms noise, even sensitive IEMs will experience no noise.
Ground Loop Noise Eliminator: Ground loop noise can occur when several devices are used together. The A90 Discrete includes a GND/LIFT switch to resolve this issue. Set it to GND for standard use, or to LIFT when ground loop noise is encountered, removing the noise.
Headphone Amp and Preamp: The A90 Discrete isn’t just drives headphones, but also serves as a preamp. In preamp mode, you receive the same high performance as in headphone amp mode, with 20ohm SE and 40ohm balanced output impedance for various power amplifiers. It supports simultaneous output from all outputs.
The Enhanced A90 furnished with XLR and RCA stereo connectors, offering more inputs when paired with Ext90, including 4 XLR and 2 RCA stereo inputs. Equipped with a 12V Trigger interface, it can be set to trigger out or passive control. With a 3.5mm cable, it can synchronize on/off with other 12V Trigger-equipped devices.
Flexible Volume Control: The Enhanced A90 features R2R volume control, composed of relays and resistor networks, offering precise control, longevity, full channel balance, and remote control. The Enhanced A90 can memorize output or input volume settings, automatically returning to the last used volume when the same output is chosen again.
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