Two classic amps, two different voices. The Fender Twin Reverb is loud, glassy, scooped clean headroom; the Marshall JCM800 is midrange-forward 80s rock crunch. Here is how their settings and the records made on them compare.
| Knob | Fender Twin Reverb | Marshall JCM800 |
|---|---|---|
| Gain | 3.5 | 6.5 |
| Bass | 5.5 | 6 |
| Mid | 6 | 6 |
| Treble | 6.5 | 7 |
| Presence | 5.5 | 6 |
Averaged from 42 (Fender Twin Reverb) and 84 (Marshall JCM800) famous recordings. Out of 10.
Go Fender Twin Reverb if you want loud, glassy, scooped clean headroom. Go Marshall JCM800 for midrange-forward 80s rock crunch. But the real point: you do not need either one. GuitarToneAdapt takes any tone recorded on these amps and re-dials it for the amp and guitar you actually own — free.
🎛️ Get either amp’s tones on YOUR rig — free →Neither is "better" — they are voiced differently. Fender Twin Reverb is loud, glassy, scooped clean headroom; Marshall JCM800 is midrange-forward 80s rock crunch. Pick by the tone you want, then adapt the settings to the amp you actually own.
Averaged across the famous recordings on each (knobs out of 10), the Fender Twin Reverb sits at gain 3.5, bass 5.5, mid 6, treble 6.5, presence 5.5; the Marshall JCM800 at gain 6.5, bass 6, mid 6, treble 7, presence 6. The biggest gap is gain, where the Marshall JCM800 runs noticeably higher.
Notable Fender Twin Reverb tones include Push, Say It Ain't So (2024 Remaster), Santeria. Notable Marshall JCM800 tones include Master of Puppets, Fade to Black, Mayonaise. GuitarToneAdapt can re-dial any of them onto the amp and guitar you already own, free.