Marshall JMD:1! Bring on the ROCK! By: Randall %A %B %e%q, %Y Featured Products, Product Videos Off Hey there folks! We’ve got a lil’ demonstration of our new Marshall JMD:1 at our Pearl City store here for you! This amp is both versatile and powerful! With effects onboard, and a 100 Watt EL34 power amp section, you’re covered from the garage to Blaisdell Arena! Come check it out today!