Frequency Response Curve 1


test conditions: USB IN--PO output,-5dB sinusoidal signal, 20Hz-20kHz(32 Ω load)
Red: left channel; Blue: right channel

Frequency Response Curve 2


test conditions: USB IN--PO output,-5dB sinusoidal signal, 20Hz-50kHz(32 Ω load)

red: left channel; Blue: right channel

Frequency Response Curve 3

test conditions: USB IN--BAL output,-5dB sinusoidal signal, 20Hz-20kHz(32 Ω load)

red: left channel; Blue: right channel

General specifications
Name/Model KA1 color Classic Black/Dark Night Green
hardware DAC: ES9281AC PRO FiiO Control is not supported.
weight About 10g size

fuselage: about 40mm x 15mm x 8mm

Line length: 70mm
Audio input interface Type-C Cable or Lightning Headset output interface 3.5mm socket
firmware upgrade The system firmware can be upgraded through USB sample rate indication

blue: below 48kHz

yellow: above 48kHz

Green: DSD

Magenta: MQA
channel balance

<0.05dB(32Ω/THD+N<1%)

 impedance adaptation

16 to 300 Ω
The highest supported sampling rate 384KHz/32bit Support DSD DSD64/128/256
power supply parameters
power supply   battery capacity  
Audio parameters
Headset Output Part Performance Parameters (3.5mm)
output power 43mW (16Ω,THD+N<1%) output amplitude 1.2V(32Ω/THD+N<1%)
45mW (32Ω,THD+N<1%) channel separation ≥ 73dB(1Khz,32 Ω load)
13mW (300Ω,THD+N<1%)
6.8mW(600Ω,THD+N<1%) output impedance <1.5 Ω (load 32 Ω)
frequency response 20Hz to 20KHz, the curve amplitude varies by 0.1dB. signal-to-noise ratio ≥ 114dB(32 Ω A)
20Hz to 50KHz, the curve amplitude varies by 0.3dB. distortion plus bottom noise <0.0005%(32 Ω A)
bottom noise <2.4uV(A calculation) <0.00018%(600 Ω A)