The Protector, the world's first ultra portable, BALANCED, takes headphone amplifier, sound reproduction at the highest level that was unmatched by any portable amp in the world. The drive capability of 4 channels teaming to bring you the highest possible headroom needed to achieve the best possible signal to noise ratio without distortion or clipping is just incredible. The Protector is the best fully differential input to the output operational amplifiers in the industry. It is a singleended analog input signal and splits it into two signals 180 degrees out of phase, one with positive polarity of the other negative. Sources such as the iPhone / iPod, CD player, phono stage have to enjoy not fully compensated if are coupled to the balanced output of Protector. The Protector is to go for all the headphones in the Hi-end market with no problem. Its high impedance or low, can the Protector, they all do. It is important to note that the protective film has independent 3Levels of profits. The low gain is designed to work with all monitors in the ears, IEMs work. The gain medium is all for the low impedance headphones are. The Hi Gain is for all the high impedance. The balanced connection to the protector is selected for its high quality and durability. It is very reliable and it will give you many years of service without problems. Balanced pins are terminated to the amplifier as follows: Left channel, PIN # 1 is a positive signal. PIN # 3 is negative signal. Right Channel...