A panel of switches found on the back panel offers an array of cool options to apply to both channels of the EP2000 and EP4000. The Clip Limiter lets you get even more out of the amplifier without overdriving either it or your speaker system. Built-in circuitry automatically senses when the EP2000 or EP4000 is being overdriven into “clipping” and then momentarily reduces the input level to avoid clipping distortion. This all happens in a few thousandths of a second, so it’s an inaudible way of avoiding audible clipping distortion. Of course, you can turn the Limiter off if you’re feeling lucky. Ultra-low frequency sounds (infrasonics) are caused by rickety stage vibrations, mic thumps and wind noise. While technically inaudible, they can cause a huge drain on amp power, potential damage to your speakers and a sludgy sound in the audible bass ranges. Both EP models feature a defeatable Low Cut Filter that chops off unwanted frequencies below 50Hz or 30Hz (depending on your PA system’s capabilities). The same panel contains the switches that allow you to put these amps to work in either stereo or bridge (mono) mode. Both the EP2000 and EP4000 can be linked to additional power amps by switching into parallel mode. There’s plenty of awesome features on the outside of the EP2000 and EP4000, but there’s also a team of cool components on the inside helping it work its magic. They come loaded with famously reliable Toshiba/Fairchild power transis