BEHRINGER STUDIO M Studio Monitor Controller This passive monitor controller requires no power, making it easy to use. It's a surprisingly good monitor controller for the price, with almost no noticeable sound quality degradation. The volume knob has a click feel, which is also a nice touch. ✅ Purchased one year ago and am selling it because I no longer use it. ⚠️ Returns and refunds are not accepted. Please understand this before purchasing. Feel free to ask any questions in the comments. <Features> All-in-one studio controller. Equipped with volume control, source select, and monitor switcher for comfortable operation in a recording environment. <Specifications> ■ Passive studio monitor controller ■ Input terminals: TRS phone x 4 (balanced/unbalanced compatible, 2 stereo pairs), 3.5mm stereo jack ※ When both INPUT B TRS phone x 2 and 3.5mm stereo mini are connected simultaneously, the stereo mini takes priority. ■ Output terminals: TRS phone x 4 (balanced/unbalanced compatible, 2 stereo pairs) ■ Volume control: 0~100% ■ Frequency response: 20Hz~20kHz ■ S/N ratio: <-90 dBu RMS, un-weighted ■ Distortion: <0.01%@1kHz, unity gain, input 4dBu ■ Crosstalk: <-60dB@1kHz, unity gain, input 4dBu ■ Maximum input level: +22 dB ■ Maximum output level: +15 dB