Presonus Eris E4.5, Active Studio Monitors, 4.5"" Woofer with Kevlar cone, 1"" Tweeter with silk cone, Two 25 Watt Class AB amplifiers, installed in the left speaker, Frequency range: 70 - 20,000 Hz, Gain control, Input impedance: 10 kOhm, Mid-range controls: Peak EQ at 1 kHz, +/- 6 dB, Treble control: Cow tail filter at 4.5 kHz, +/- 6 dB, Crossover frequency: 2.8 kHz, Sound pressure (SPL @ 1 m): 100 dB, Front-side on/off switch, Volume control and headphone jack, stereo mini jack, Inputs: TRS jacks (balanced), RCA pair and stereo mini jack (unbalanced), Shielded against HF interference, Switch-on delay, Output current limiter, Overheating, transient and subsonic protection circuit, Dimensions (W x D x H): 163 x 180 x 241 mm, Weight: 3.7 kg left speaker with power amplifiers, 2.2 kg right satellite speaker, Purchase includes: 2 Monitors (1 pair), connection cable from the left to the right speaker, connection cable stereo mini jack to 2x RCA (L/R) and connection cable stereo mini jack to stereo mini jack, 8 self-adhesive foam pads