Usually 3-5 Days. 45 Day Lowest Price - 100% Satisfaction Guarantee. K Series amplifiers deliver more power and sound while using less energy than conventional amplifiers. And it's all in a durable, maintenance-free package that's just two rack spaces high. Using patented Balanced Current Amplifier (BCA) circuitry, K Series amplifiers give you massive amounts of power while generating just one tenth the heat of conventional amplifiers.