The PreSonus Eris E4.5 are compact, affordable powered studio monitors for smaller project studios and musicians who want to trust what they're hearing from their speakers. With kevlar woofers, silk dome tweeters, and built-in 25-watt amplifier, the E4.5s put out a surprising amount of bass frequencies and plenty of power. A handy volume knob on the left monitor means there's no need for a separate monitor controller to push or attenuate these speakers, making them the perfect solution for beginners and even modest portable rigs.