The Little Labs Voice of God was originally designed to capture the chest resonance of vocalists or voice over artists, enabling them to still have a proximity type effect without having to be so close to the mic, hence the name, VOG, or Voice of God. However, when it was heard it on kick drum and bass, it became clear this would be the go to device to make these instruments sound huge.
The VOG lets users sweep a sharp peak resonance from 20 to 300 Hz, while anything below the peak is rolled off at a steep -24dB per octave. This lets users focus on the low end they want, while eliminating low-end mush and unnecessary woofer excursion.

A subharmonic can be the focus, or the fundamental, or upper harmonics. On a kick drum, for example, the overall effect of turning VOGs frequency knob sounds like someone is tightening or loosening the drumhead. In a mix, VOG allows users to place the bass spectrum instruments so they do not interfere or get in the way of each other.
 
The Features
For vocalists, voice over artists, kick drums and bass
Little Labs first entry in the popular API 500-Series module format
Sweep a sharp peak resonance from 20 to 300 Hz
Rugged pull-out handle
Anything below the peak is rolled off at a steep -24dB per octave
Eliminating low-end mush and unnecessary woofer excursion