2-3 Weeks. 45 Day Lowest Price - 100% Satisfaction Guarantee. The ABM 900 EVO II is a 575+575 watts RMS bi-amp bass amp head designed to satisfy both bass-purists and tech-heads alike. Switchable for passive and active instruments with a blend of solid state and dual triode tube preamps stages, its sub-harmonic generator enables you go to anywhere from a subtle, thickening of the sound to unbridled, bone crushing tone!