The K4 is a powerful 300-Watt compact and light-weight combo amplifier for keyboards. The product houses 5 drivers in it's speaker section and a chassis that has 3 amplifiers, a set of tubes, 2 fans (with heat sinks) and 6 circuit boards. All of these components potentially rattle and/or buzz at various frequencies. Yorkville uses a specific method to help prevent the sound energy from being transferred from to the speaker compartment to the chassis.