Alesis Nearfield Studio Monitors, ALSM1A520USBX220

Two-way, active, bi-amplified pair of reference studio-monitor loudspeakers
Wide, 56 – 20,000 Hz frequency response
60 W system with 30W per speaker
Works with iPad via Apple USB Adaptor (sold separately)
Five-inch lightweight polypropylene woofer
One-inch silk-dome tweeter
Integrated USB audio interface with 16-bit, 44.1/48 kHz recording and playback
Two balanced-1/4"" inputs
Stereo, 1/4"" headphone output
Magnetically shielded for placement near TV and computer monitors
Low-resonance cabinet with tuned bass port
Bi-color signal/clip indicator
Switchable power supply ensures worldwide operation / Dimensions: 21.5 x 27 x 18.5 cm / Weight: 9 kg