Product Description


B-121 is a ULF subwoofer with biggest woofer unit in TRS audio, which is a ULF active subwoofer with DSP inside, it increased system integration and reduced system cost. The power amplifier module uses a powerful powersoft module with a single 21-inch ultra-long stroke neodymium magnet unit that provides a driving force for the cymbal. The B-121 frequency response reach to 27Hz. The low-frequency extension is a medium-to-large-scale sound reinforcement system. From a single low frequency to a complete low-frequency array, its unique pressure feedback design allows the ultra-low frequency to release power while retracting.



Model: B-121

Unit type: 1x21”

Frequency response: 27Hz-120Hz

Power rated: 1800W

Impedance: 4Ω

Coverage angle(Horizontal x vertical): All directions

Sensitivity: 99dB

SPL: 142dB

Dimension(WxHxD): 650x620x900mm

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We adhere to the business philosophy of excellent quality, reasonable price, fast delivery and thoughtful service.


TRS speakers in the United States, with the perfect combination of natural art and advanced professional technology, have always been loved by global sound engineers and acoustic designers for their high definition and strong shock.

Contact Information


Company address:

7th floor, Litai building, Lianfeng Industrial Park, Zhoucun, Lishui Town, Nanhai District, Foshan City, Guangdong Province


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