Frequency Response Curve 1


Test conditions：USB input, -5dB Sinusoidal signal，High gain，6.35SE PO (32Ω loaded)
Red: left channel; Blue: right channel

Frequency Response Curve 2

 

Test conditions：USB input, -5dB Sinusoidal signal，High gain，4.4mmBAL PO (32Ω loaded)

Red: left channel; Blue: right channel

Frequency Response Curve 3

 

Test conditions：USB input, -6dB Sinusoidal signal，High gain，20Hz-50KHz，RCALINE OUT (10KΩ loaded)

Red: left channel; Blue: right channel

Frequency Response Curve 4

 

Test conditions：COAX input, -5dB Sinusoidal signal，low gain，6.35SE PO (32Ω loaded)

Red: left channel; Blue: right channel

Frequency response curve 5


Test conditions：COAX input, -5dB Sinusoidal signal，High gain，4.4mmBAL PO (32Ω loaded)

Red: left channel; Blue: right channel

Frequency response curve 6

 

Test conditions：COAX input, -5dB Sinusoidal signal，High gain，RCA LINE OUT (10KΩ loaded)

Red: left channel; Blue: right channel

Frequency Response Curve 7

 

Test conditions：OPT input, -5dB Sinusoidal signal，High gain，6.35SE PO (32Ω loaded)

Red: left channel; Blue: right channel

Frequency Response Curve 8

Test conditions：OPT input, -5dB Sinusoidal signal，High gain，4.4mmBAL PO (32Ω loaded)

Red: left channel; Blue: right channel

frequency response curve 9

 

Test conditions：OPT input,  -6dB Sinusoidal signal，High gain，RCA LINE OUT (10KΩ loaded)

Red: left channel; Blue: right channel

General specifications
Name / Model No.  K7/K7 BT Hardware solution  DAC: AK4493S*2 , USB: XMOS XUF208 , Voume IC：NJU72315 * 2, AMP：THX AAA 788+ * 2
Color  Black Volume Scroll Potentiometer+ADC Sampling
Weight ≈610g FiiO Control K7 BT supported
Gain L/H Firmware upgrade XMOS can be upgraded via USB 
Maximum supported sampling rate

PCM 384kHz-32bit/DSD256（USB DAC）

PCM 192kHz-24bit（COAX）

PCM 96KHz-24bit（OPT）

 Sampling rate indication Blue：44.1KHz/48KHz
Yellow：88.2/96/176.4/192/352.8/384KHz
Green：DSD64/128/256
Recommended headphone impedance 16~300Ω    
Buttons and interfaces
Buttons input button*1+gain switch*1+output switch*1 USB USB B（data）
LINE IN RCA sockets LINE OUT RCA sockets
OPT IN TOSLINK COAX IN RCA sockets
BAL PO Standard 4.4mm port SE PO Standard 6.35 mm port
Power parameters
Power supply DC 12V/2A Battery capacity  /
Audio parameters
Line output performance parameters
Frequency response 20Hz~20KHz：±＜0.4dB（UAC) Crosstalk ≥102dB (1kHz/10kΩ)
20Hz~20kHz：±＜0.8dB(SPDIF  IN ) Noise floor ＜3μV（dbA）
20Hz~50KHz：±＜2.2dB（UAC) SNR ≥116dB (dbA，UAC)
20Hz~50kHz：±＜1.7dB(SPDIF  IN )
THD+N ＜0.0005%(1kHz/10kΩ/dbA) Output level          ≥2Vrms
Headphone output performance parameters（6.35mm）
Output power1 L+R≥1220mW+1220mW（32Ω /THD+N＜1%) Output impedance ＜1Ω（32Ω） 
Crosstalk ≥77dB (1 kHz/32Ω)
Output power2 L+R≥140mW+140mW（300Ω / THD+N＜1%) Noise floor ＜3.1μV（dbA，AUX  IN)
Frequency response 20Hz~20KHz：±＜0.3dB（UAC) ＜4.4μV（dbA，UAC）
20Hz~20kHz：±＜0.7dB(SPDIF  IN )
20Hz~50KHz：±＜2.1dB（UAC) SNR ≥128dB (dbA，AUX IN）
≥120dB (dbA，UAC）
20Hz~50kHz：±＜1.6dB(SPDIF  IN )
THD+N ＜0.0003% (1 kHz/32Ω/dbA) Peak output voltage ≥18.9Vpp
Balanced headphone output performance parameters（4.4mm）
Output power2 L+R≥2000mW+2000mW（32Ω /THD+N＜1%) Output impedance ＜1Ω（32Ω）
Crosstalk ≥124dB(1 kHz/32Ω)
Output power3 L+R≥560mW+560mW（300Ω / THD+N＜1%) Noise floor ＜5.1μV（dbA，AUX  IN)
Frequency response 20Hz~20KHz：±＜0.3dB（UAC) ＜7.7μV（dbA，UAC）
20Hz~20kHz：±＜0.7dB(SPDIF  IN )
20Hz~50KHz：±＜2.1dB（UAC) SNR ≥128dB (dbA，AUX IN）
≥120dB (dbA，UAC）
20Hz~50kHz：±＜1.6dB(SPDIF  IN )
THD+N ＜0.0003% (1 kHz/32Ω/dbA) Peak output voltage ≥37.7Vpp