อยากจะทราบมากครับว่าต่างกันมากขนาดไหน รบกวนผู้ที่ลองแล้วมาเปรียบเทียบให้ฟังด้วยนะครับ :D

เท่าที่ลอง research หา spec ดูแล้วค้นพบว่า

X3 Spec:
CPU: Ingenic Z4760 600MHz dual cores
DAC: Wolfson WM8740
Opamp: AD8397 (headphone-out)
Internal Memory: 8GB (7.3GB usable)
Expansion Slot: TF card, support up to 64GB SDXC (FAT32)
Data transfer：USB 2.0 High Speed, Write/Read - 4.5 MB/s
Output Connection:
3.5mm Stereo Headphone-out
3.5mm stereo line-out
3.5mm Coaxial S/PDIF (adapted included)
Recommend Headphone Impedance: 16~300Ω
Size: 55 x 109 x 16 (mm)
Weight: 122g
Volume: 60 steps digital control
Screen: TFT 320 x 240.
Hardware EQ:
Treble +/-10dB
Bass +/-10dB
Channel Balance: +/-5dB, 0.5dB increment.
Gain: 0dB (Low) and 6dB (High)
Power Supply: USB 5V/500mA (> 1.5A recommended)
Battery Capacity: 3000mAH Li-Polymer
LED Indicator: Red – Charging; Green - Full
Battery life: > 10hours
Charging time: < 4hours (5V, 1.5A)
Line-out Performance:
Distortion < 0.004%@1KHz
SNR > 108 dB (A weighted）
Frequency Response: 10Hz~20KHz（+/-0.2)
Dynamic > 103dB
Stereo Crosstalk > 90 dB @10KΩ @1KHz
Line Voltage > 1.7Vrms
Headphone-out Performance:
Power > 540 mW@16Ω, 270 mW@32Ω, 30 mW@300Ω
Output Impedance <0.3Ω
Stereo Crosstalk >75 dB@1KHz
Distortion< 0.005%@1KHz
Frequency Response: 10Hz~20KHz（+/-0.2)
Peak Voltage > 8Vp-p
SNR > 105 dB
Max Current > 250 mA
Relay Protection again voltage / current surge
Format Support:
Lossless (Max Bitdepth / Bitrate):
APE (Fast) 24/192
APE (Normal) 24/96
APE (High) 24/96
FLAC 24/192
WAV 24/192
WMA 9.1 LOSSLESS 24/192
Apple Lossless (ALAC) 24/192
Lossy (Up to 16bit / 48kbps):
MP3
MP2
OGG
AAC
WMA
Album Art, ID3 tag, Lyric and CUE Supported
Selectable Gapless Playback
Firmware Upgradable via TF card
Auto Sleep (15 to 60 minutes) and Resume (last track or last position) supported

X5 Spec:
General Specifications
Dimensions: 64.6x114x15.6 (WxLxH, mm)
Weight: 122g
Display: 2.4" 260,000 colors HD IPS Screen at 400x360
CPU: Injenics 4760B 600MHz Dual Core
DAC: PCM1792A, supports 192KHz/24Bit
Outputs: 3.5mm Headphone jack, 3.5mm Line-output, 3.5mm Digital Coax output
Storage: 2 x microSD slots (currently max supported 64GB x 2)
Battery: 3700mAh Li-Polymer Battery, up to 15 hours playback time
Headphones impedance range: 16~300Ω
Gain selection: 0/6 dB

Partial performance parameters for line output
THD+N: < 0.0025%@1KHz
SNR: > 115dB (A-Weight ）
Frequency Response: 20Hz~20KHz（+/-0.1)
Dynamic range: > 115dB
Crosstalk: > 100 dB @10KΩ @1KHz
Line output Level: > 1.5 Vrms

Part of the performance parameter of phone out
Output power 1: > 460 mW@16Ω THD<1%
Output power 2: > 255 mW@32Ω
Output power 3: > 28 mW@300Ω
Output impedance: <0.26Ω
Crosstalk: >75 dB@1KHz
THD+N: < 0.003%@1KHz
Frequency response: 20Hz~20KHz（+/-0.1)
MAX output voltage: > 8 Vp-p
SNR: > 115 dB
MAX output current: > 150 mA

Power and battery
Power: USB 5V/500mA (recommended USB 5V 2A
Battery capacity: 3700 mAH
Charging display: red light indicator, green light turns on when fully charged
Battery life: >10 Hours (firmware un-upgraded)
Battery display: Yes
Charging time: < 4 Hours

Supported formats
Lossless: APE(fast:): 192K/24B; APE(normal): 96K/24B; APE(high): 96K/24B; FLAC: 192k/24B; WAV: 192k/24B; WMA 9.1 LOSSLESS: 96k/24B; Apple Lossless 192K/24B;
Lossy compression: MP2, MP3, AAC, ALAC, WMA, OGG

พอดูจากกำลังขับภาคหูฟังแล้วไม่แน่ใจว่า X3 กับ X5 ตัวไหนกำลังขับมากกว่ากัน ใครที่ลองแล้วรบกวนมาแชร์กันบ้างนะค๊าบ