The FiiO AM2A is a medium powered headphone amplifier module for the X7 and X7 MKII high-resolution portable music players. The AM2A is the official modified version based on the non-official modification of the AM1 module, which utilizes the combo AD8620 + AD8397ARDZ as its operational amplification. The headphone module uses the same voltage supply as the AM2, hence the name. The AM2A presents a smooth, neutral sound signature with clear high-mids and rich lows.