The TNA-2120SA is a multi-channel active subwoofer for powering a complete TNA line array system. The TNA-2120SA features two high power 12-inch low frequency woofers with exceptionally high output. The TNA-2120SA active subwoofer houses three channels of high performance amplification and cutting edge built in DSP presets. As a modular system, the TNA-2120SA is capable of powering up to 6 x TNA-2051 line array satellite cabinets. With Integrated rigging hardware, and optional suspension bracket and dolly board, the TNA-2120SA can be installed quickly and easily. The TNA-2120SA offers a max SPL of 137dB and offers a frequency response as low as 35Hz. When combined upto six TNA-2051's, the TNA-2120SA offers an ideal venue installation or point source solution without the extra expense of rack amplifiers and processors. Ideal for venues, schools, sports, gyms, hotels and more.