Check the listing for details. TKL T2531 Professional Graphic Equalizer Audio Processor Two 31-Band Spectrum. Color: Black, Condition: New. Listed at 199.99 USD. Product DescriptionTKL T2531 Professional Graphic Equalizer Audio Processor Two 31-Band Spectrum A dual 31-band equalizer is built with innovative technology and advanced production technology. With advanced circuit design and high-quality components, it can achieve a frequency response of 10Hz-50KHz, a signal-to-noise ratio greater than 90dB, a total harmonic distortion less than 0.005% and a channel isolation greater than 90dB. Moreover, it boasts built-in power supply, hard-wired relay bypass to turn off the power, and two-second power-on delay. Its intuitive design can meet the needs of most sound reinforcement projects. It has simple and intuitive controls. Thanks to built-in DSP memory chip, you can pre-store 10 modes for calling. Press SAVE button lightly, and you can turn knobs CONTRO or GAIN to choose any mode from 1-10. Featuring balanced input and output for low-noise work, chassis/signal ground suspension function eliminates AC noise.Specification:- Power supply: 220V/110V （optional）- Sound transmission gain: 1dB or 11dB- Line input impedance: 15KΩ- Line output impedance: 300Ω- Frequency response: 80Hz-15kHz- Total harmonic distortion + noise: