1. AS358AMTR-E1 Substitution Conclusion The feasibility of substituting AS358AMTR-E1 for TL4581DR is limited, primarily due to significant performance differences between this general-purpose amplifier and the original audio amplifier. The slew rate and gain-bandwidth product (GBW) of the AS358AMTR-E1 are unspecified and likely considerably lower than the TL4581DR’s 9 V/µs and 10 MHz, which may cause distortion and bandwidth limitations in high-frequency audio signal processing, compromising audio fidelity. The input offset voltage increases from 500 µV to 2 mV, reducing amplification accuracy and potentially introducing DC errors and noise. However, the AS358AMTR-E1 exhibits a clear power advantage with a quiescent current of only 700 µA per channel (compared to 8 mA for the TL4581DR) and offers a wider supply voltage range (3–36 V vs. 10–30 V), providing better low-voltage adaptability. If the application does not demand high audio performance—such as non-critical amplification or low-frequency signal conditioning—and prioritizes low power consumption and wide supply operation, the AS358AMTR-E1 can serve as a substitute. For high-fidelity audio or high-speed signal applications, direct substitution is not recommended.