Product highlights

Fully-differential 24-bit R2R DAC with 192 precision resistors

Dual NOS and OS decoding modes

PCM 384kHz/24bit and DSD256 support

XLR and RCA preamp/line outputs

10-band high-precision PEQ with app and web control

Fully balanced audio amplifier circuit with protection features

DC/AC dual power supplies with shielded internal PSU and external DC input option

ELNA RA3 audiophile-grade capacitors

2400mW+2400mW balanced output into 32Ω

Custom HD LCD display with always-on capability

Minimalist aluminum design with skylight accent

Bluetooth 5.4 with LDAC/AAC/SBC support

Adjustable RGB lighting and timer shutdown

Specs
Color: Black, Silver
Main control chip (MCU): ESP32-S3
USB chip: XMOS XU316
DAC: Fully differential true 24-bit R2R DAC resistor arrays
Volume control chip: NJW1195A
R2R and LPF op-amp: OPA1642 ×4
LO buffer op-amp: LTA8092 ×2
Headphone amplifier: OPA1642 ×2 + TPA6120A ×2
Inputs & outputs
USB input: 384kHz/32bit, DSD256
Coaxial input: 192kHz/24bit, DSD64
Optical input: 96kHz/24bit
USB connector: Dual Type-C
Display & power
Display: Custom LCD
Power input: AC 100–240V 50/60Hz; DC 12V/2.5A
Physical Dimensions: ~210 × 188 × 42mm (including feet)
Weight: ~980g
Power output (single-ended)
L+R ≥ 1220mW + 1220mW (32Ω, THD+N＜1%, SE, high gain)
L+R ≥ 150mW + 150mW (300Ω, THD+N＜1%, SE, high gain)
Power output (balanced)
L+R ≥ 2400mW + 2400mW (32Ω, THD+N＜1%, balanced, high gain)
L+R ≥ 600mW + 600mW (300Ω, THD+N＜1%, balanced, high gain)
Performance
Frequency response: 20Hz–80kHz, attenuation＜2.9dB
SNR: ≥116dB (A-weighted)
Noise floor:
PO ＜9uV (A-weighted)
BAL ＜18uV (A-weighted)
PO ＜5uV (A-weighted, M gain)
BAL ＜8uV (A-weighted, M gain)
Output impedance:
PO ＜0.7Ω (32Ω load)
BAL ＜1Ω (32Ω load)
THD+N: ~0.0173% (1kHz / –6dB @32Ω)

What's included
K13 R2R
Power adapter
Power cable
USB data cable
Headphone adapter
Quick start guide
Warranty card