FiiO K11 R2R | Desktop Headphone DAC and Amp

Experience Pristine Digital Audio with the FiiO K11 R2R, a Desktop DAC and Headphone Amplifier that Delivers Reference-Level Sound Utilizes a Resistor Ladder DAC, known for its warm, analog sound Dual OPA1642 op-amps deliver ample power to drive demanding headphones Supports up to 384kHz/32bit and DSD256 Multiple input options: USB, coaxial, and optical inputs Compact size and robust aluminum chassis, ideal for desktop setups Check out our FiiO 2025 Buyer's Guide here! Specially Designed Audio Circuit The audio signal is transmitted via a USB interface processor to a digital audio bridge. After being processed by an FPGA, it is sent to the R2R DAC for 4-channel output after decoding. It then passes through two Ti OPA1642 op-amps for low-pass filtering and single-ended analog signal converting, and transmits to the NJW1195A electronic volume control chip for precise volume adjustment. The output stage uses two SGM8262 op-amps for 4-way phase inversion and amplification, resulting in