Note: This studio monitor is sold as a pairDescriptionThis pair of Alesis M1 Active 520 Near-Field Reference Monitors offers an incredible definition and flat frequency response with the help of high-precision drivers and a carefully designed crossover. The rear-port provides deep bass-extension and high SPL output, and the rear-mounted EQ switches allow the user to tailor the speaker to the studio environment. A 1"-thick front baffle minimizes speaker resonance and the acoustic waveguide evenly disperses high-frequency sound. The Bass Density control lets you dial in balanced sound regardless of room or placement. The Alesis M1 520 monitor's top-mounted power/clip indicator lets you know if the speaker is clipping. FEATURES-2-way, 75W active near-field reference monitors -5" low-frequency driver -1" silk dome tweeter -Acoustic waveguide -Low-Frequency Density switch -Rear port design -Hi, Mid, and Low-Frequency EQ switches -Top-mounted Power Switch/Clip Light -1"-thick front baffle -Magnetically shielded -1/4" TRS connector -Volume control Tech Specs Low-Frequency Driver 5" Polypropylene cone Mid Frequency Driver No High-Frequency Driver 1" Silk Dome Tweeter LF Amplifier 50 Watts HF Amplifier 25 Watts Crossover Active, 2.8 kHz Frequency Range 56 Hz - 20 kHz Impedance 10 kOhms, Unbalanced 20 kOhms, Balanced Maximum Sound Pressure Level (SPL) 90 dB @ 1m Controls and Indicators 1 x Gain Control Knob 1 x Acoustic Space Switch 1 x Hi Boost Switch 1 x Mid-Boost Switch 1 x Lo 3dB Roll Off Switch 1 x AC Voltage Selector Switch 1 x Top-Mounted Power Switch/Clip LED Connectors 1 x 3-pin XLR Female, Balanced 1 x 1/4" TRS/TS Phone, Bal/Unbal Shielded Yes Dimensions (HxWxD) 10.5 x 6.5 x 7.75" (267 x 165 x 197mm) Weight 13 lb (6 kg) Specialties Multi-Voltage Power Supply with Selector Switch 1/4" Input with Bal/Unbal Read Acoustic Space Compensator Switch for Wall or Corner Placement Rear Bass Port Packaging Info Box Dimensions (LxWxH) 21 x 15.2 x 12.5"