Yamaha - MS101-4, 30W Powered Monitor Speaker, 77 Hz – 20 kHz, 115 dB Max SPL
Maximum output level (1m; on axis) 115 dB SPL. Frequency range (-10dB) 77 Hz–20 kHz. Yamaha - MS101-4 - Powered Monitor Speaker. Speaker type Full range Powered Speaker, Bass-reflex Type. Max SPL 115 dB.