Double bass

Role in the mix

The double bass (acoustic, plucked or bowed) is the bass of jazz, bluegrass, rockabilly, tango, orchestral music, much singer-songwriter music, and some neo-soul and lo-fi genres. Compared with the electric bass it has more air and less sustain: a percussive finger attack (1–3 kHz), a woody body (100–300 Hz), a less constant fundamental (the resonant body has irregular resonances) and a tail that decays quickly. Range: E1 (41.2 Hz) on the lowest open string, C1 (32.7 Hz) with the extension; it is a transposing instrument (it sounds an octave below the written pitch). The mix has to make the notes legible (especially in walking jazz) without turning it into an electric bass.

Recording and choosing the sound

• Microphone: condenser (large or small diaphragm) at 15–30 cm, aimed between the fingerboard and the upper part of the f-holes; avoid aiming into the f-hole (boom). A second mic close to the fingers for the attack.
• Pickup (piezo under the bridge or magnetic): more isolation, a more “rubbery” and nasal sound; in the mix it is blended under the mic for the body.
• Align pickup and mic (the mic is late by 0.5–1 ms) and check polarity.
• In live recordings or with the band in the same room, bleed (drums, piano) is part of the sound: no gate.
• Samples/VSTs: choose libraries with round-robin and finger/bow noises; program realistic velocities and lengths.

Gain staging

Peaks −12/−8 dBFS; plucked notes have strong transients and a high crest factor (14–18 dB).

Corrective EQ

• HP at 35–40 Hz (handling noise, floor).
• Boom from the f-hole/body 80–200 Hz: often one specific note (e.g. around 90–110 Hz) booms: narrow dynamic EQ or multiband on that band.
• Box 250–500 Hz: light cut of 1–3 dB if it sounds closed.
• Piezo pickup: nasality at 700 Hz–1.5 kHz and “quack”: cut 2–4 dB.

Creative EQ

• Warmth +1/+2 dB at 80–120 Hz (wide bell) if the recording is thin.
• Wood and finger attack: +1/+3 dB at 700 Hz–1 kHz and/or 2–3 kHz for walking-line legibility.
• Bow air: light shelf at 5–8 kHz for bowed parts in film scores.

Compression

• Light, so you do not lose the “breath”: opto (LA-2A, CLA-2A) 2:1–3:1, 2–4 dB GR, or VCA with attack 20–40 ms (the finger attack gets through) and release 100–200 ms.
• In pop/neo-soul mixes: a bit more control (4–6 dB) and a soft limiter on the peaks of the loudest notes.
• Light parallel compression for sustain if the double bass has to carry slow ballads.

Transient shaper

Attack −10/−20% to soften plucks that are too hard; Attack + for a walking line that has to emerge in a trio with bright drums; Sustain + to lengthen notes that decay too quickly.

Saturation

Light tape/tube (UAD Studer, Distructor tape, Saturn 2) for density and translation; in lo-fi hip hop and jazz-hop the sampled double bass is saturated and filtered (LP 3–5 kHz) for a “vinyl” sound. Avoid obvious distortion.

Delay

No, except for effects in trip-hop or lo-fi.

Reverb

• In jazz the double bass shares the same room as the rest of the group: natural short room or hall (0.8–1.5 s), low send, HP on the return at 150–200 Hz so as not to muddy the low end.
• In an orchestra: the double bass section takes the hall (hall 2–2.5 s) and sits behind and to the right.

Modulation

None.

Stereo and panning

• Pop/modern jazz: center or slightly off (±10–20) to leave room for the kick in the center in a jazz trio.
• Classic jazz recorded in stereo: the double bass can sit on the right or left depending on the stage (many Blue Note and Prestige records of the 1950s and 1960s are panned extremely; today a centered image is preferred).
• Orchestra: double basses on the right (+40/+60), in depth.
• The sub stays mono anyway; if you use stereo mics, check the correlation.

Sidechain

Rarely; in neo-soul mixes with an electronic kick, a light dynamic EQ on the kick’s fundamental.

Automation

• Fader rides note by note in solos and walking lines (the double bass has “dead” notes and notes that ring out).
• More presence (2 kHz) in solos.

Differences by genre

Common mistakes

• Treating it like an electric bass: compression and bass boosts make it rubbery.
• HP too high: it loses weight in the walking line.
• Mic inside the f-hole: uneven boominess.
• Pickup without a mic: nasal, plastic sound.