Fully differential true 24bit R2R resistor array DAC
FIIO’s newly self-developed four-channel fully differential 24bit R2R DAC consists of 2 x 48 precision thin-film resistor arrays per channel, totaling 192 resistors with 0.1% tolerance and low temperature drift (30ppm). This configuration delivers a unique and charming sound. In addition, the K11 R2R employs a fully differential architecture, resulting in lower noise, with fewer FFT harmonics and a darker music background compared to typical ones.
Support for PCM 384kHz/24bit and DSD256 decoding (DSD256 requires setting the DSD output mode to Native on the source device, internally converting to PCM before being decoded by the R2R resistor arrays), means the K11 R2R can easily handle high-precision audio signals and fully exhibit the details within, providing you with an excellent audio experience.
Dual NOS/OS modes, double the fun
The K11 R2R comes with dual modes of NOS and OS. Double the fun with different modes.
NOS (Non-Oversampling) Mode: Maintains the original sampling rate for decoding, preserving authentic sound and allowing you to enjoy an organic and captivating musical experience.
OS (Oversampling) Mode: Upsamples globally to a high sampling rate of 384kHz, for superior audio performance and even more refined, clear sound.
Specially-designed audio circuit and power supply
In the K11 R2R, 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. Then, it 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 outputs of singed-ended and balanced analog signals. The audio circuit features gain controls. It is complemented by a specially-designed headphone protection circuit and a pop noise elimination system, ensuring the audio circuit is both high quality in sound produced and reliable.
The K11 R2R uses up to 17 low-noise LDO precision regulator IC and 2 DC-DC converters, providing multi-channel specialized power supply of －9V, 8V, ±7.5V, ±6V, 5.4V, 3.3V, 1.8V, and 1.2V. These are combined with an external custom 12V switching power supply to ensure the purity of the power supplied and provide a solid foundation for stronger power output.
1300mW+1300mW high output power, 3 gain levels and 3 volume curves, high-quality electronic volume control NJW1195A, high-quality Beryl solid capacitors... For more impressive features of the K11 R2R, please refer to the product page.
