Explore Neural Amp Modeler (NAM) profiles of the iconic Marshall JCM900 series. From the high-gain 4100 and 4500 dual reverb heads to the versatile SL-X and MKIII models, these amps defined hard rock and metal tones throughout the '90s. Used by artists like Zakk Wylde, Dimebag Darrell, and Phil Demmel, the JCM900 brought increased gain stages and tighter low-end response to the classic Marshall sound, making it a staple for heavier genres while maintaining that unmistakable British crunch and character.