BX2-Pro is LIEEWHO-Audio Independent research and development， continued Less 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~+-15V 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：280mA

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=8Ω ; 3600mW@RL=32Ω；1200mW@RL=300Ω

Full packing included：

（BX2-PRO*1、TYPE-C cable*1，4.4mm TO 4.4mm jumper*1，BX2-PRO User menu*1，Warranty card*1.）

Remark: Ships form China