Usually 3-5 Days. 45 Day Lowest Price - 100% Satisfaction Guarantee. The XLS Series of power amplifiers from Crown represents a new era in affordable, quality power amplification. The line consists of three models in a uniform, rugged chassis, incorporating the best of tried-and-true design principles and innovative features. XLS Series amplifiers are professional stereo power amplifiers engineered to meet demanding audio requirementsreliably and within budget. Plus, every XLS Series amplifier is backed by Crowns unequaled Three-Year, No-Fault, Fully-Transferrable Warranty that covers everything.