Noam Wallenberg demonstrates how to achieve a tight and punchy low-end using the Waves C6 plugin as a multi-band expander on the drum bus.
By focusing on two frequency bands—below 100 Hz and between 100 to 300 Hz—he effectively controls the low-end dynamics of the drums. Initially, he is reducing the gain on these low-end frequencies with the bands make-up gain. This sets the stage for controlled expansion, allowing the kick drum to dynamically enhance the low-end only when it hits.
This technique provides precise control over the low-end, enabling the engineer to adjust attack and release times for each frequency band. This ensures that the low-end is impactful yet controlled, preventing it from overwhelming the mix while adding a punchy presence to the kick drum.