In Stock. 45 Day Lowest Price - 100% Satisfaction Guarantee. The Ampeg B500DR bass head works like 4 amps in 1! The amp "remembers" 4 complete amp settings and allows total recall at the push of a button. Best of all, it's analog, baby! The Ampeg B500DR is a perfect blend of digital pots and analog circuitry for the ultimate in versatility for the ultimate player...YOU!