The TNA-1800SA Active subwoofer features a HH designed 18-inch low frequency woofer with exceptional high output. Equipped with integrated rigging hardware, the TNA-1800SA can be installed quickly and easily. The TNA-1800SA offers a max SPL of 138 dB and offers a frequency response as low as 32Hz. The TNA-1800SA offers an ideal venue installation or point source solution. Ideal for venues, schools, sports, gyms, hotels and more.