The AM1 is an Amplifier Module that is compatible with X7. It has been designed for music listeners who use portable headphones and earphones that do not require high output power. The AM1 utilizes OPA1612 as its voltage amplification, which is a best-selling audio operational amplifier from Ti that features low noise and power consumption. The current amplifier AD8397 is a more classic take with rail-to-rail high output. The AM1 consumes less energy while also not generating excess heat. A value for money at this price point.