Which compression method is not limited to high or low frequencies?

Wide dynamic range compression is designed to manage sound across a broad range of frequencies without being limited to just high or low frequency ends. This form of compression adjusts the gain applied to sounds based on their intensity, allowing softer sounds to be amplified without overly boosting louder sounds, regardless of their frequency. This makes it particularly useful for individuals with varying degrees of hearing loss across different frequencies.

In contrast, other methods mentioned like peak clipping are primarily concerned with limiting sound peaks and can cause distortion; linear amplification increases sound in a straight line, which may not effectively accommodate the nuances of different frequencies. High-frequency emphasis specifically focuses on enhancing higher frequencies, which inherently limits its effectiveness at lower frequencies. Thus, wide dynamic range compression stands out as the method that offers a more comprehensive approach to frequency management.