PreSonus Eris Studio 4 Powered 4" 50W Studio Monitor with EBM Waveguide (Single) 4.5" Woofer and 1" Silk-Dome Tweeter, 55 Hz to 20 kHz Frequency Response, 100 dB SPL, EBM Waveguide for a Wide Sweet Spot, Control Level, HPF, MF Trim, and HF Trim,...