These speakers are less than one year old. The pair were $ 5,200 when new and are now selling for less than half price. The enclosures are model TR 218 each loaded with 2 18"18B-1200 Speakers. They come with 2 logos to mount on the front screens,and 8 casters to mount on the back, 4 on each speaker, for ease of handling. The following are the specifications: Frequency range: 35 - 140 Hz SPL @ 1 Meter: 106 db Max SPL: 139 db RMS (W): 1500 Peak Power: 3000 Watts Impedance: 4 option 8 ohms Active crossover 80 - 120 Hz Low Freq: 2 x 18" woofers Connections: Speakon Height: 30 1/5" Width: 42 1/2 " Depth: 25.1/4" Weight: 195 pounds Ultra-efficient, High Sensitivity, low and precise LF extension and high Power Handling make these one of the most empressive subwoofers on the market. Any touring group will welcome these high performance subwoofers for medium and large venues.