GTD Audio 2 Channel 4500 Watts 1u Stereo Professional Power Amplifier AMP T-250 New Generation Amplifier Technology, Supper Light Weight, Powerful, Long-Lasting with Crystal Clear Sound quality & Ultra low Noise Design ATR (Accelerated Transient Response) technology for ultimate punch and clarity 500 Watts (2 x 250 ) @ 8 Ohms RMS, 2 x 450 Watts @ 4 Ohms RMS, 4500 Watts Peak Frequency response 10Hz  50kHz at 1.5 dB Dimensions (WxDxH): 17 x 9" x 1.5,