Audio systems: A woofer, which is designed to reproduce low-frequency sounds, should be connected to the input through which type of filter?

Introduction / Context:
Woofers are specialized loudspeakers designed to handle bass and sub-bass frequencies, typically below 200 Hz. To ensure they receive only the appropriate frequency range, crossover filters are applied.

Given Data / Assumptions:

• Woofer frequency range: ~20 Hz to 200 Hz.
• Input audio contains the full frequency spectrum.
• A filter is required to ensure only low frequencies reach the woofer.

Concept / Approach:
A low pass filter allows low-frequency signals to pass while attenuating higher-frequency components. This ensures the woofer does not attempt to reproduce mid or high frequencies, preventing distortion and ensuring fidelity.

Step-by-Step Solution:

Verification / Alternative check:
Commercial audio crossover designs confirm woofers are fed via low-pass sections tuned at crossover frequencies (100–200 Hz in home audio; 80–120 Hz in car systems).

Why Other Options Are Wrong:

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Final Answer: