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Model

X7-AM1

(Specifications with AM1 headamp 

module (bundled low-gain module

for sensitive headphones and IEMs;  OPA1612+AD8397 amp+buffer.  

±3.1V voltage supply, software gain))

X7-AM2

(Specifications with AM2 headamp 

module (Medium-power type;

MUSES02+BUF634 amp+buffer.  ±7.5/5.3V voltage supply, hardware gain))

X7-AM5

(Specifications with AM5 headamp 

module (High power type;

MUSES02+TPA6120A2 amp+buffer.  ±9V voltage supply, hardware gain))

X7-AM3

(Specifications with AM3 headamp

module (Balanced type;

TPA1622*6 amp+buffer, ±5V voltage supply, software gain),  2.5mm TRRS Balanced Output)

Partial Performance Parameters for Headphone Output   
Output Power 1 >100 mW(32Ω/1 kHz) >300 mW(32Ω/1 kHz) >500 mW(32Ω/1 kHz) >540mW(32Ω/1kHz)
Output Power 2 >200 mW(16Ω/1 kHz) >350 mW(16Ω/1 kHz) >800mW(16Ω/1 kHz) >420mW(16Ω/1kHz)
Output Power 3 >10 mW(300Ω/1 kHz) >30 mW(300Ω/1 kHz) >55 mW(300Ω/1 kHz) >70mW(300Ω/1kHz)
Frequency Response 10 Hz~76 kHz (-3dB) 10 Hz~51 kHz (-3dB) 9 Hz~84 kHz (-3dB) 5 Hz~83 kHz (-3dB)
SNR ≥115 dB (A-weighted) ≥118 dB (A-weighted) ≥120dB (A-weighted) ≥115dB (A-weighted)
Output Impedance <0.5 Ω(32Ω load) <0.5 Ω(32Ω load) <0.5 Ω(32Ω load) <0.3 Ω(32Ω load)
Channel Separation >73 dB(32Ω/1 kHz) >72 dB(32Ω/1 kHz) >72 dB(32Ω/1 kHz) >100 dB(32Ω/1 kHz)
THD+N <0.0008% (32Ω/1 kHz) <0.001% (32Ω/1 kHz) <0.001% (32Ω/1 kHz) <0.0008% (32Ω/1 kHz)
Peak Output Voltage >5.2 Vp-p >8.8 Vp-p >11 Vp-p >11 Vp-p
Max. Output Current >250 mA(For reference) >250 mA(For reference) >250 mA(For reference) >160 mA(For reference)
Drive Ability 16~100Ω (Recommended) 16~150Ω (Recommended) 16~300Ω (Recommended) 16~300Ω (Recommended)
Balanced output N/A N/A N/A Yes (2.5mm TRRS Balanced output)
Battery Life Test Conditions  
Battery Life ≥ 9h ≥ 8h ≥ 6h >6h
Screen OFF OFF OFF OFF
Gain L L L L
EQ OFF OFF OFF OFF
Load

M3 open earbuds (27 Ω)

M3 open earbuds (27 Ω) M3 open earbuds (27 Ω) SE846+Balanced cable (16Ω)
Volume 55 52 54 50
Test File MP3 44.1kHz/16bit (Download link) MP3 44.1kHz/16bit (Download link) MP3 44.1kHz/16bit (Download link) MP3 44.1kHz/16bit (Download link)
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