Audiophilepure

The headliner here is the 24-bit R2R Array for analog-like warmth. It shares an ultra-high precision ultra-low jitter unified clock source with its flagship FiiO M27, and that chain is what FiiO calls its Digital Audio Purification System, including a high-capacity FPGA and dual custom crystal oscillators. The pre-amp section features TI Burr-Brown OPA1637 fully differential op-amps for I/V conversion and signal conditioning. There’s also a precision volume control and independent power supplies for the analog and digital amplifier stages, something you don’t see in comparably priced players.

We’re seeing a lot of R2R electronics of late. An R-2R ladder circuit is a specific arrangement of resistors using only two values, R and 2R, designed to convert digital binary signals into analog voltages (Digital-to-Analog Conversion or DAC).