One amp settings — Line 6 Spider V 20

The Metallica guitar tone for “One”, dialed in for a Line 6 Spider V 20 with a Aria Pro ll STG-series. Studio version, ...And Justice for All (1988)

Original rig

Mesa/Boogie Mark IIC+ amp, ESP MX-220 with EMG 81/85 active pickups, noise gate

Tight, scooped thrash rhythm with aggressive treble bite and dry attack

Amp settings — Line 6 Spider V 20

CHANNELMetal (or Insane) amp model

Knob	Setting (0–10)
Gain	7
Bass	7
Mid	2
Treble	7
Presence	6
Reverb	0
Master	5

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Guitar

PICKUPbridge TONE10 VOLUME10

Signal chain

01Noise Gate (Spider V built-in)

Essential for the tight, percussive palm-muted sections — eliminates string noise between riffs

Threshold 6 · Decay 3

Why these settings

Your Aria Pro II has passive single coils vs Hetfield's hot EMG actives, so I raised gain +1 and bass +1 to compensate for lower output and thinner low-end. The Spider V's Metal model approximates the Mark IIC+ tight voicing better than the Insane model which is looser. Mids are scooped hard at 2 — this is the ...And Justice signature sound.

PRO TIPFor the machine-gun palm-muted sections, anchor your picking hand firmly on the bridge saddles and use all downstrokes with a stiff pick angled slightly toward the neck — this replicates Hetfield's percussive attack that defines the riff.

Get this tone on your amp

These settings are for a Line 6 Spider V 20. ToneAdapt matches any song to whatever amp, guitar and pedals you own — first match is free.

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Song, artist and gear names are used to identify the tone being matched; ToneAdapt is not affiliated with or endorsed by the artists or manufacturers mentioned. Settings are AI-generated starting points — trust your ears.