Next to the Eris E5 and E8 models, Presonus present the E4.5 model. The Eris E4.5 Hi-Definition 2-Way 4.5" Nearfield Monitors (Pair) are designed for recording studio tracking, mixing, and mastering. Each monitor features a 4.5" Kevlar woofer for midrange and a 1" silk dome tweeter for treble powered by a 25W class AB amplifier.