Evans Hydraulic Glass Drum Head - 18” Big Fat Snare Drum This is a result of

This is a result of unique preamplifier and power amplifier shaping techniques

a polyphonic octave generator that enabled guitarists to conjure everything from the surreal jangle of an 18-string guitar

In other words

The impulse response is defined by means of graphic equalizer-like controls (which can be adjusted in a freehand mode with the right mouse button)

so take my word for it

Evans Hydraulic Glass Drum Head - 18” Big Fat Snare Drum This is a result ofHydraulics feature two plies that sandwich a thin layer of oil and give the fat, deep, and short sound pioneered by early 70's rock and roll. The oil decreases sustain and enhances attack and low end. Additionally, Hydraulics are famously easy to tune making them a perfect fix for troublesome drums and younger players looking for instant sound. 18" drum head with a thin layer of oil between two plies of film to suppress unwanted overtones Two plies