R15S is a professional active stereo subwoofer engineered to complement Montarbo B and R series full-range speakers. Its 15” low-frequency driver with 4” voice coil delivers deep, precise bass with a frequency response down to 45 Hz, providing the low-end foundation needed for music, live performance, and portable PA systems. The system reaches a maximum SPL of 130 dB, ensuring impact and clarity in small to medium venues.

Powered by a Class D amplifier rated at 500 W RMS / 1000 W peak, R15S offers responsive low-frequency output with ample headroom. Its passive radiator design enhances low-end extension while eliminating the need for active cooling, providing reliable performance during extended operation.

Onboard DSP, including 28/56-bit processing and 24-bit / 48 kHz AD/DA conversion, offers precise control over level, crossover frequency, and polarity, allowing seamless integration with main PA speakers. Connectivity includes dual Combo inputs for stereo operation and XLR line output for LINK + XOVER configuration, enabling flexible system expansion and multi-subwoofer setups.

Built from multilayer wood and finished with protective polyurea, the enclosure is engineered for durability during transport and repeated use. Measuring 430 × 580 × 590 mm and weighing 31.9 kg, R15S delivers professional-grade low-frequency reinforcement while remaining practical for portable applications.