Perhaps an EQ to dial in aspects of sound that you're looking to enhance.
The low frequency (bass) range up to around 200Hz or so contains the fundamentals (lowest frequencies) of instruments like kick drum and bass—this range usually affects the tonal quality that’s typically described as “thump” or “boom”, in studio jargon.
The lower-midrange (Low-Mids) includes everything from upper bass—“punch”—to the frequencies that often account for a “boxy” quality, something usually avoided in a modern mix.
The area I labelled just “Midrange” is the center couple of octaves of the audible range. This range is often attenuated (reduced in level) to prevent too much overlap of harmonics and overtones in a mix, which can negatively impact overall clarity.
The upper-midrange (Hi-Mids) is typically referred to as the “presence” range—with most instruments and voices the overtones here can bring the part forward in the mix, which is described as adding presence. Accentuated frequencies in this range can help pull up a part in the mix, but too much can be harsh and peaky.
The highest frequency range (treble) is sometimes referred to as “air”. Most of what falls into this range is the upper overtones of bright instruments like cymbals and acoustic guitar, and some subtle ambience—a little boost up here can sometimes add a bit of openness, a.k.a. “air”.
CUT — up to 150hz
It is common to do a hi-pass to get rid of the low end of the snare. It’s unnecessary and just clutters the space.
BOOST —150-250hz
This is the body of the snare drum, boost to get more weight out of your snare drum.
CUT —500-800hz
This is the boxiness of the snare, when we cut it we get a little more clarity between the lows and the highs.
BOOST — 1500-4500hz
This is the brightness and snappy-ness of the snare drum. Boost to taste.
CUT – 4500 and above
This is the ringy sound of the snare. We can cut or put a lowpass to dampen it.