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Model

X7-AM2:

(Specifications with AM2 headamp 

module (Medium-power type;

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

hardware gain))

X7-AM2A:

(Specifications with AM2A headamp 

module (Medium-power type;

AD8620+AD8397ARDZ .  ±7.5/5.3V voltage supply,

hardware gain))

X7-AM2C:

(Specifications with AM2C headamp 

module (Medium-power type;

LME49860+AD8397ARDZ amp+buffer.  ±7.5/5.3V 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)

X7MKII-AM3A:

(Specifications with AM3A headamp

module (Balanced type;

AD8620+OPA926 amp+buffer, ±5V voltage supply, software gain),  

2.5mm TRRS Balanced Output)

Partial Performance Parameters for Headphone Output       
Voltage Amplication MUSES02 AD8620B LME49860 TPA1622 AD8620
Current Buffer BUF634 AD8397ARDZ AD8397ARDZ TPA1622 OPA926
Output Power >300 mW(32Ω/1 kHz) >420 mW (32Ω/1 kHz) >430 mW (32Ω/1 kHz) >540mW(32Ω/1kHz) ≥400 mW(32Ω /THD+N<1%)
Drive Ability 16~150Ω (Recommended) 16~150Ω 16~150Ω 16~300Ω (Recommended) 16~300Ω (Recommended)
Frequency Response 10 Hz~51 kHz (-3dB) 8 Hz~92kHz (-3dB) 6 Hz~82kHz (-3dB) 5 Hz~83 kHz (-3dB) 6 Hz~60kHz(-3dB)
THD+N <0.001% (32Ω/1 kHz) <0.002%(32Ω) <0.002%(32Ω) <0.0008% (32Ω/1 kHz) <0.003% (1 kHz)
SNR ≥118 dB (A-weighted) ≥118 dB (A-weighted) ≥119 dB (A-weighted) ≥115dB (A-weighted) ≥119 dB (A-weighted)
Channel Separation >72 dB(32Ω/1 kHz) >73 dB (32Ω/1 kHz) >72 dB (32Ω/1 kHz) >100 dB(32Ω/1 kHz) ≥97 dB (1 kHz)
Output Impedance <0.5 Ω(32Ω load) <0.3 Ω (32Ω) <0.3 Ω(32Ω) <0.3 Ω(32Ω load) <1.7Ω (32Ω loaded)
Peak Output Voltage >8.8 Vp-p >10.6 Vp-p >10.6 Vp-p >11 Vp-p >10 Vp-p
Max. Output Current >250 mA(For reference) >250 mA(For reference) >250 mA(For reference) >160 mA(For reference) >150 mA (For reference)
Balanced Output N/A N/A N/A Yes (2.5mm) Yes (2.5mm)
Battery Life Test Conditions      
Battery Life (For reference) ≥ 8h ≥ 7.5 h ≥ 7.5 h >6h >7h
Screen OFF OFF OFF OFF OFF
Gain L L L L L
EQ OFF OFF OFF OFF OFF
Load M3 open earbuds (27Ω)

M3 open earbuds (27Ω)

M3 pen earbuds (27Ω) SE846+Balanced cable (16Ω) 32Ω
Volume 52 52 52 50 51
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) MP3 44.1kHz/16bit (Download link)
 
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