The M154R2 is a passive loudspeaker with a frequency response of 45Hz - 17kHz (+/-3 dB). It offers a system power handling capacity of 500W RMS (1000W AES), with a nominal impedance of 8 ohms. The speaker delivers a maximum SPL of 126dB, making it suitable for professional sound reinforcement applications. This discontinued model featured reliable performance across the audio spectrum for installations and portable sound systems requiring standard pro audio capabilities.