SM 155

About the SM 155

The Infinity SM 155 is a 3-way, 4-driver loudspeaker system designed for studio monitoring and high-volume applications. It features a 15-inch polypropylene woofer, two 4.5-inch polypropylene midrange drivers, and a 1-inch high output Polycell tweeter with electronic fusion. The speaker has a frequency response range of 29Hz to 27kHz, a sensitivity of 102 dB at 1 watt/1 meter, and an impedance of 8 ohms. It includes crossover frequencies at 500 Hz and 5500 Hz and is recommended to be driven by amplifiers rated between 10 to 300 watts. The cabinet is available in black ash or walnut vinyl finish, measuring approximately 17.75 x 40.25 x 12.5 inches (45 x 102 x 32 cm) and weighing about 30 kg. Originally priced around 1,600 Deutsche Marks per speaker, the SM 155 is noted for its loud, neutral sound and robust bass, making it suitable for both studio and party environments. It also features midrange and high-frequency level adjustments to tailor sound to room acoustics.