BX-2 Pro

LESS BX2-PRO Specifications
 
BX2-Pro is LessFox Independent research and development， continued BX-2 & plus version, we have more extensive experience to improve portable full balance（C.A.S.T）CLASS-A headphone products。
Software： Design base on HI-END class KRELL's equipment C.A.S.T current circuit（Full balance current design）， from the audio source to the output signal is a fully balanced design，  most of the hi-resolution audio equipment is using Current Mode,it improves ultra-high frequency responding,
 ； over capacitor signal passthought to reduce distortion and more natural。
Hardware： The whole machine are using a very rare perfect match transistor； volume control using TI company ultra-low noise PGA4311 volume chips； signal stage are using 4 pcs Toshiba 2SK170（99% matched）and 2SK5171/A1930 transistors（99% matched）； VISHAY crystal resistors，
matched power transistor to make sure 4 channel conformity； CNC CU 24K gold plated case to improve highest level noise isolation； Made in Japan Pentaconn4.4 and Taiwan Fujitsu 3.5 socket to reach the Hi-End level。
 
Product introduce：
 
  Support4.4 full balance input and output； or 3.5 single-end input and output
  Support2V-4V input level
  3 level gain control（Low, Mid,Hi）
  Support dual power source DC+-8~17V +- external power supply
  Built-in 3.7V-8000mHA Lithium battery
  Support TYPE-C socket DC5V charger
 
Specifications：
 
  Internal operation voltage：DC+-12V；charging voltage：DC5V
  Idles current：about280mA
  Output voltage（0DB）：18.7Vrms@RL=300Ω;10.7Vrms@RL=32Ω
  Frequency responsing ：（10HZ~30KHZ):-0.1dB;（20HZ~20KHZ):0dB;
  S/N level（non-counting）58.7uV@RL=32Ω
  S/N range（SNR）：-110dB class A
  Total Harmonic Distortion（THD+N）>0.065%(1KHz); 0.0005%（20KHZ）
  Frequency separation ：106dB（1KHZ）@RL4.4mm
  Max power output：5900mW@RL=32Ω；1200mW@RL=300Ω