EQ feathering applies small amounts of equalization at adjacent frequencies instead of a large boost at one frequency

Rather than applying a large EQ boost at a single target frequency, feathering distributes the correction across the frequencies adjoining the main one — e.g. instead of +3 dB at 100 Hz, add +1.5 dB at 100 Hz and +0.5 dB at 80 and 120 Hz. Per the book, this lowers the phase shift brought about by analog equalizers and results in a smoother sound. Mastering EQ generally works in very small increments (tenths of a dB) at many points across the band.

Examples

Instead of a single +3 dB shot at 100 Hz, the engineer feathers +1.5 at 100 Hz and +0.5 at 80 and 120 Hz for a smoother, less resonant result.

Assessment

Describe the EQ feathering technique and explain why it produces a smoother result than a large boost at a single frequency.