. .9i-90SA Pro （"Lark" second Generation ）DAC/headphone Amp/Pre Amp， It is a low-priced product and carries some high-level audio technology and practical functions. Although it is cheap but its audio performance is close to that of high end products. It is good choice for most Junior enthusiast.

. .Due to success of 9i-92SA " golden thrush" second and first generation the third generation was born. but it's DAC chip was changed from AK4497 to ESS9038Pro . . .As a general rule the performance of ESS DAC chip is highly analytical and dynamic but it's sound is a little hard, so there are many special adjustment have applied to the third Generation and got good effort . . .It already has many users and has very good comments. It has strong competitiveness

. The nickname of 9i-906 headphone amplifier is "silver fox". Purpose is to drive “monster” headphones. Its circuit architecture originates from a large power amplifier. When many redesigns for electrical characteristics and adjustments of sound style were completed, "silver fox" became a wonderful headphone Amp. High analytical, high density and neutral without tendency, especially power driving fprce, make it leader in similar products. . Whether high sensitivity or low ,high resistance or low , dynamic earphone or flat panel headset, "silver fox" can adapts to them by it's super driving ability and quality. It can show the characteristics of headphone more than normal headphone amp.