IEM Type AM1 is the amp module coming with the X7 bundling package. Its main advantages of small amount heat generation, low power consumption and long battery life are specially designed for earbuds users and some portable headphone users that don't require very high output power. The AM1 utilizes OPA1612 as its voltage amplification, which is a best-seller audio operational amplifier of Ti with low noise and power consumption. The current amplifier AD8397 is a more classic one with rail-to-rail high output. In consideration of cost, heat generation, power consumption and battery life, AM1 might be a very cost-effective choice.
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