What is the main advantage of using an op-amp audio filter compared to a passive LC audio filter?

Using an operational amplifier (op-amp) audio filter offers the main advantage of exhibiting gain, which is a significant benefit in audio processing applications. Op-amps are capable of amplifying the input signal, allowing the filter to not only shape the frequency response but also increase the overall signal level. This capability is especially important in audio systems where maintaining signal strength is crucial to avoid noise and distortion when processing audio signals.

In contrast, passive LC filters do not introduce gain; they can only attenuate the signal. While passive filters can effectively select certain frequencies, any loss in signal strength during filtering cannot be compensated within the filter itself. This means the signal may require additional amplification after filtering, which could lead to further complexity in the design.

The other options either refer to characteristics that do not accurately highlight the primary benefit of op-amps in this context or are aspects that come from different operational contexts. For instance, while greater bandwidth can be a characteristic of certain op-amp based designs, it is not the definitive advantage over passive filters. The statement about requiring no power is misleading, as op-amps do require an external power supply to function, whereas passive filters do not. Therefore, the key advantage of using op-amps in audio filters lies