General specifications
Name/Model K9 hardware solution DAC:ES9068A * 2,USB:XMOS XUF208, Bluetooth: QCC5124,LPF:OPA1612 * 2, Volume IC:NJU72315 * 2,AMP:THX AAA788 + * 2, Transformer: Linear Transformer;
color black Volume control type analog potentiometer (ADC sampling)
weight Approximately 2660g channel balance L12 ~ R12 (0.5dB per stage)
gain L/M/H FiiO Control support
Bluetooth format indication support sample rate indication support
size 200x 224.5x 72mm (excluding foot pads) firmware upgrade The system firmware and Bluetooth version can be upgraded through USB
Deep Standby Long press the multi-function key for about 3 seconds Low Power Reminder
Bluetooth emission Bluetooth Reception (5.1) AAC/SBC/aptX/aptX LL/aptX HD/LDAC/atpX Adaptive
Bluetooth format indicator SBC: blue, AAC: cyan, aptX HD: yellow, aptX: purple, aptX LL: purple, LDAC: white, atpX Adaptive: green charging indicator
The highest supported sampling rate 768kHz-32bit/DSD512(USB DAC) adaptation impedance 16~600 Ω
192 kHz-24bit (coaxial)
96 KHz-24bit (fiber)
keys and interfaces
key Solid key + toggle switch USB USB B
Single-ended input interface RCA socket Balancing Line Input Interface 4.4mm balance socket
digital fiber input interface optical fiber socket Digital coaxial input interface RCA socket
Balancing output interface 4.4mm socket, XLR4 balanced socket Headset output interface standard 6.35mm socket
Balancing line output interface XLR3 balance socket Single-ended line output interface RCA socket
power supply parameters
power supply AC 100-120V ~/AC 220-240V ~ (recommended) battery capacity
Charging time The duration of the PO
Audio parameters
Some performance parameters of single-ended line output
distortion plus noise <0.00026%(1kHz/10 kΩ/A weighting) signal-to-noise ratio ≥ 119dB (A weight)
channel separation ≥ 111dB (1kHz/10 kΩ) bottom noise <2.9 μV(A weighting)
frequency response 20Hz~50kHz (-1.5dB) line output level 2.4Vrms (1kHz/10kΩ)
Performance Parameters of Balanced Line Output
distortion plus noise <0.00025%(1kHz/10 kΩ/A weighting) signal-to-noise ratio ≥ 124dB (A weight)
channel separation ≥ 120dB (1kHz/10 kΩ) bottom noise <3.1 μV(A weighting)
frequency response 20Hz~50kHz (-1.5dB) line output level 4.8Vrms (1kHz/10kΩ)
Headset Output Part Performance Parameters (6.35mm)
Output Power 1 ≥1W(16Ω / THD+N<1%,AUX/UAC/SPDIF/BT IN) output impedance <1 Ω(32 Ω)
Output Power 2 ≥1.5W(32Ω /THD+N<1%,AUX/UAC/SPDIF/BT IN) channel separation ≥ 75dB (1kHz/32 Ω)
Output Power 3 ≥200mW(300Ω / THD+N<1%,AUX IN) distortion plus noise <0.00028% (1kHz/32 Ω/A weighting)
bottom noise <4.8 μV(A weighting) signal-to-noise ratio ≥ 124dB (A weight)
frequency response 20 Hz~50kHz (-1.5dB) peak output voltage >21Vp-p
Balance Headset Output Part Performance Parameters (4.4mm/XLR4)
Output Power 1 ≥1W(16Ω / THD+N<1%,AUX/UAC/SPDIF/BT IN) output impedance <1 Ω(32 Ω)
Output Power 2 ≥2W(32Ω / THD+N<1%,AUX/UAC/SPDIF/BT IN) channel separation ≥ 114dB (1kHz/32 Ω)
Output Power 3 ≥780mW(300Ω / THD+N<1%,AUX IN) distortion plus noise <0.00029% (1kHz/32 Ω/A weighting)
bottom noise <7.1 μV(UAC, gain m, maximum volume) signal-to-noise ratio ≥ 119dB (A weight)
frequency response 20Hz~50kHz (-1.5dB) peak output voltage >42Vp-p