One amp settings — Line 6 Spider iv 15

The Metallica guitar tone for “One”, dialed in for a Line 6 Spider iv 15 with a Ibanez GRX70QA. Studio cut, ...And Justice for All (1988) — iconic heavy rhythm/machine-gun breakdown tone

Original rig

ESP MX-220 ('EET FUK') with EMG 81/60 pickups into Mesa/Boogie Mark IIC++ head (V-scoop graphic EQ) and Marshall 4x12 cab

Ultra-tight, aggressively mid-scooped thrash rhythm with surgical percussive low end and biting treble

Amp settings — Line 6 Spider iv 15

CHANNELMetal amp model (Red)

Knob	Setting (0–10)
Gain	6
Bass	8
Mid	2
Treble	7
Reverb	0
Master	4

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Guitar

PICKUPbridge TONE10 VOLUME10

Why these settings

The Line 6 Spider IV 15's Metal (Red) channel is modeled on a Mesa Dual Rectifier/high-gain circuit, so gain saturates aggressively and is dialed back to 6 to preserve palm-mute articulation. Mid is set to 2 to replicate Hetfield's extreme Mesa 5-band graphic EQ V-curve (cutting 750Hz–1.2kHz) without turning completely hollow. Your Ibanez GRX70QA ceramic bridge humbucker supplies the necessary high-output bite, while presence is omitted because the Spider IV 15 faceplate lacks this control.

PRO TIPAnchor your palm firmly against the bridge saddles and execute aggressive, strictly down-picked strokes to achieve the signature razor-sharp, percussive chug of the machine-gun riff.

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These settings are for a Line 6 Spider iv 15. ToneAdapt matches any song to whatever amp, guitar and pedals you own — first match is free.

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