Parameters

General specifications
Name / Model No. K5Pro Hardware solution DAC: ES9038Q2M,USB: XMOS XU208
Color Black Volume Scroll Potentiometer+ADC Sampling
Weight ≈480g FiiO Control Unsupported
Bluetooth format indication Unsupported Sampling rate indication Blue:44.1KHz/48KHz
Yellow:88.2/96/176/352.8/384/705.6/768KHz
Green:DSD64/128/256/512
Firmware upgrade System firmware and XMOS can be upgraded via USB Recommended headphone impedance 16~300Ω
Maximum supported sampling rate 768kHz-32bit/DSD512(USB DAC)
192kHz-24bit(COAX)
96KHz-24bit(OPT)
Buttons and interfaces
Buttons Toggle switch*2(Gain switch+ Input switch) USB B type USB
Coaxial in RCA sockets Optical in Optical fiber socket
Line out RCA sockets Phone out 6.35mm
Power parameters
Power supply DC15V  1.5A Battery capacity /
Audio parameters
Headphone output performance parameters(6.35mm,UAC/SPDIF IN)
Output power Output impedance <1.2Ω
1250mW(32Ω,THD+N<1%) Crosstalk ≥80dB
140mW(300Ω,THD+N<1%) Output level 6.4Vrms
THD+N <0.0009%(1kHz/-10dB@32Ω) SNR ≥118dB (dbA)
Frequency response 20Hz~50kHz: (-2dB) Noise floor Gain=H,<8uV(dbA)
Gain=M,<6uV(dbA)
Gain=L,<4uV(dbA)
20Hz-20KHz:(-0.2dB)
Headphone output performance parameters(6.35mm,Line IN)
Output power Output impedance <1.2Ω
1500mW(32Ω,THD+N<1%) Crosstalk ≥64dB
170mW(300Ω,THD+N<1%) Output level 6.9Vrms
THD+N <0.003%(1kHz/32Ω) SNR ≥118dB (dbA)
Frequency response 20Hz-20KHz:(-0.2dB) Noise floor Gain=H,<8uV(dbA)
Gain=M,<6uV(dbA)
Gain=L,<4uV(dbA
Line output performance parameters(RCA,UAC/SPDIF/Line IN)
THD+N <0.0012%(1kHz/-10dB@10kΩ,UAC/SPDIF) SNR ≥115dB (dbA)
<0.0008%(1kHz/10kΩ,Line IN) Noise floor ≤3.5uV(dbA)
Crosstalk ≥95dB (1kHz/10kΩ) Output level 2Vrms (1kHz/10kΩ)
Frequency response 20Hz~50kHz: (-2dB)
20Hz-20KHz: (-0.2dB)

Frequency Response Diagram of Curve 1.

 

Test conditions: USB DAC input, -5dB sinusoidal signal,

20Hz-20kHz, headphone output (32Ω load)

red: left channel; Blue: right channel

Frequency Response Diagram of Curve 2.

 

Test conditions: Spdif input, -5dB sinusoidal signal,

20Hz-20kHz, headphone output (32Ω load)

red: left channel; Blue: right channel

Frequency Response Diagram of Curve 3.

 

Test conditions: Line input, -5dB sinusoidal signal,20Hz-20kHz,

headphone output (32Ω load)

red: left channel; Blue: right channel

Distortion Diagram of Curve 1.

 

Test conditions: USB DAC input, -10dB sinusoidal signal,

20Hz-20kHz, Phone output (32Ω load)

red: left channel; Blue: right channel

Distortion Diagram of Curve 2.

 

Test conditions: Spdif input, -10dB sinusoidal signal,

20Hz-20kHz, Phone output (32Ω load)

red: left channel; Blue: right channel

Distortion Diagram of Curve 3.

 

Test conditions: USB DAC input, -10dB sinusoidal signal,

20Hz-20kHz, Line output (10KΩ load)

red: left channel; Blue: right channel

Distortion Diagram of Curve 4.

 

Test conditions: Spdif input, -10dB sinusoidal signal,

20Hz-50kHz, Line output (10KΩ load)

red: left channel; Blue: right channel

Comparisons

K5Pro K5Pro ESS
Ports USB port USB B USB B
Line out RCA Line Out RCA Line Out
Line in RCA Line in RCA Line in
Opt in Y Y
Coax in Y Y
Phone out 6.35mm 6.35mm
Configuration Input switch USB DAC IN/Line IN/SPDIF IN USB DAC IN/Line IN/SPDIF IN
Gain switch High/Medium/Low High/Medium/Low
Volume knob Volume adjustment + Power switch Volume adjustment + Power switch
Indicator Sampling rates indication:

≤48K:Blue

>48K:Yellow

DSD:Green

Sampling rates indication:

≤48K:Blue

>48K:Yellow

DSD:Green

DAC AK4493 ES9038Q2M
Volume IC NJW1195AV NJW1195AV
USB XMOS208 XMOS208
MCU STM8S003F3U6 UM8005
Supported Sampling Rates USB in PCM: Up tp 768KHz/32bit

DSD: DSD64/DSD128/DSD256/DSD512

PCM: Up to 768KHz/32bit

DSD: DSD64/DSD128/DSD256/DSD512

Coax in Up to 192KHz/24bit Up to 192KHz/24bit
Opt in Up to 96KHz/24bit Up to 96KHz/24bit
USB Audio Mode UAC2.0 UAC2.0
Others Dimensions ≈120x130x55mm ≈120x130x55mm
Weight ≈436g ≈480g
Audio parameters Output level

(THD<1%)

PO USB IN/SPDIF IN:6.3V/6.3V(1.227W)

Line IN:6.9V/6.9V

USB IN/SPDIF IN:6.8V/6.8V(1.442W)

Line IN:6.93V/6.916V

LO USB IN/SPDIF IN/Line IN:2.2V/2.2V USB IN/SPDIF IN/Line IN:2.2V/2.2V
Noise floor PO USB IN/SPDIF IN/Line IN:

Gain=H,<8uV(dBA)

Gain=M,<6uV(dBA)

Gain=L,<3uV(dBA)

USB IN/SPDIF IN/Line IN:

Gain=H,<8uV(dBA)

Gain=M,<6uV(dBA)

Gain=L,<4uV(dBA)

LO USB IN/SPDIF IN/Line IN:≤3.5uV(dBA) USB IN/SPDIF IN/Line IN:≤3.5uV(dBA)
SNR (dBA+lowpass) PO ≥118dB ≥118dB
LO ≥115dB ≥115dB
Distortion/THD+N PO USB IN/SPDIF IN:<0.003%(1KHz)

Line IN:<0.007%(1KHz)

USB IN/SPDIF IN:<0.0012%(1KHz)

Line IN:<0.003%(1KHz)

LO USB IN:<0.0022%

SPDIF IN/Line IN:<0.0013%

USB IN:<0.0015%

SPDIF IN/Line IN:<0.0008%

Frequency response PO/LO: 20Hz-20KHz:Attenuation:0.2dB PO/LO: 20Hz-20KHz:Attenuation:0.2dB
Gain H/M/L:16dB/12dB/6dB H/M/L:16.6dB/12dB/6dB
Crosstalk PO:63.3dB(AUX_IN)

LO:90dB (AUX_IN)

PO:80dB(USB DAC/OPT/COX)

LO:90dB (USB DAC/OPT/COX)

PO:64dB(AUX_IN)

LO:96dB (AUX_IN)

PO:80dB(USB DAC/OPT/COX)

LO:98dB (USB DAC/OPT/COX)

Channel balance PO,±0.1dB

LO,±0.1dB

PO,±0.1dB

LO,±0.1dB

MAX output voltage PO:19.5Vp-p

LO:56.2Vp-p

PO:19.5Vp-p

LO:6.2Vp-p

DNR PCM:110dB PCM:113dB