C-weighting is described as which of the following?

• A. Is flat at all frequencies except at very low and very high levels.
• B. Is flat across all frequencies.
• C. Emphasizes mid frequencies.
• D. Exaggerates high-frequency content.

Answer: (A)

C-weighting is basically a nearly flat response across the audible frequency range, designed to treat frequencies more equally than the A-weighting does. It stays flat across most of the spectrum and only shows deviations at the very low and very high ends, which is why the description that it is flat except at those extremes is the best fit. This helps when you measure higher sound levels where you want a broad-spectrum view without boosting any particular band. In contrast, A-weighting emphasizes mid frequencies and attenuates lows and highs, which is not the case with C-weighting, and statements about being flat across all frequencies or exaggerating high-frequency content aren’t accurate.