TechPowerUp published a review on the Quick Look: FiiO KA5 Portable DAC/Amplifier
A quote from the article:
FiiO adds to its portable DAC/amplifier line with the new KA5 which uses two Cirrus Logic CS43198 DACs, dedicated op-amps, and a capable USB audio bridge to allow plenty of power and good sound off its two headphone outputs. It also has an OLED screen with an onboard OS for added customization to sweeten the deal.Quick Look: FiiO KA5 Portable DAC/Amplifier Review