Experience home theater and music as the artist intended with the most award winning high-end subwoofer brand, REL Acoustics. The T9i enriches modest systems with deliciously sumptuous natural bass, high quality construction, and gorgeous finishes. Features high quality long throw drivers and powerful, reliable amplifiers. Makes music and cinema sound more natural with enhanced spatial resolution. Increases the soundstage depth and imaging for a truly high end experience. The Most Powerful T/i Subwoofer Available. Perfect for stereo or home theater systems. Matches well with any system. Use a single T9i for rooms 100-400 sq. feet or a Stereo Pair for rooms larger than 400 sq. feet Arrow Wireless compatible, Front-firing 10" long-throw steel chassis driver, 10" Down-firing Passive driver, 300 watt Class A/B amplifier with High Level Neutrik Speakon, Low Level single RCA, and .1/LFE RCA inputs, -6dB @ 28Hz in room frequency response.