12XU amp settings — Marshall mg MG15CFR

The Minor Threat guitar tone for “12XU”, dialed in for a Marshall mg MG15CFR with a Ibanez GIO GRG170DX. Studio version, First Two 7"s / Minor Threat EP (recorded 1981 at Inner Ear Studios, Arlington VA)

Original rig

Marshall JCM800 or similar British-voiced amp cranked, Gibson SG or similar humbucker guitar, no pedals — raw amp distortion recorded by Don Zientara at Inner Ear Studios

Raw, aggressive, midrange-forward punk crunch with minimal low-end, cutting treble attack, and zero effects — stripped-down hardcore tone

Amp settings — Marshall mg MG15CFR

CHANNELOD

Knob	Setting (0–10)
Gain	7
Bass	3
Treble	7
Reverb	0
Master	6

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Guitar

PICKUPbridge TONE10 VOLUME10

Why these settings

The MG15CFR has no mid knob — use the Contour at 3-4 (counterclockwise, toward 'full mids') to avoid the scooped sound that kills punk bite. The OD channel gets close to early DC hardcore crunch. Original was a cranked Marshall with mids pushed — your amp's OD channel is voiced similarly but with less headroom, so gain 7 delivers comparable saturation without fizz. Bass stays low (3) because Lyle Preslar's tone was tight and cutting, not boomy.

PRO TIPDig in hard with downstrokes on the low strings and let the pick attack do the work — DC hardcore tone comes from aggressive right-hand technique more than gain. Palm-mute the chugging parts loosely for that raw Dischord sound.

Get this tone on your amp

These settings are for a Marshall mg MG15CFR. 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.