FIIO K13 DAC R2R Headphone Amplifier Silver

The FiiO K13 is a versatile device that acts as both a DAC and headphone amplifier. Digital-to-analogue conversion is handled by a balanced R2R resistor network, supporting files up to PCM up to 32bit 384kHz and DSD256. For its amplification stage, the K13 uses OPA1642 and TPA6120A chips in a balanced arrangement for a total output power of up to 2x2400mW under 32Ω.

FiiO K13: NOS/OS mode

The K13's R2R DAC also features NOS (Non-Oversampling) and OS (Oversampling) modes. OS mode allows you to increase your data stream up to a sampling rate of 384kHz, making it easier to apply digital filters that eliminate unwanted artefacts associated with the conversion process. The result is a clearer, but smoother sound.

NOS mode, on the other hand, takes the opposite approach by retaining the file's original sampling rate, thus not applying the same post-conversion filters. The result is certainly less precise, but also more raw and organic.

FiiO K13: Balanced amplification of 2400mW+2400mW

The entire audio chain, including the R2R DAC, low-pass filter, volume control, and headphone amplifier, utilises fully balanced signal processing for excellent interference elimination, minimal distortion, and high dynamic range. The amplifier circuit also includes gain control and POP noise elimination for a robust and reliable audio experience. As a result, the K13 is capable of delivering robust amplification of 2400mW+2400mW into 32Ω.

FiiO K13: Three adjustable gain levels

In order to offer maximum compatibility with most headphones and IEMs on the market, the K13 features three different gain settings, each with a specific volume control curve.