The Electro-Voice TX1181 is an 18-inch passive subwoofer designed as a high-power LF supplement for the Tour X series, specifically complementing TX1122 and TX1152 models. Featuring a high-excursion 18-inch EVS-18S woofer, it delivers powerful low-frequency reproduction with a frequency range of 45-700 Hz (-10 dB). The subwoofer incorporates a 6 dB/octave low-pass filter enabling parallel connection without additional amplification. With a nominal impedance of 8 ohms, it offers 100 dB sensitivity and can achieve a maximum SPL of 132 dB. The unit handles 500 W continuous and 2000 W peak power within a durable braced plywood/MDF enclosure finished in black EVCoat.