The Rolls DB24 Stereo Direct Interface is a two channel isolation device designed to connect high impedance devices to low impedance devices. This passive unit has a heavy duty steel chassis and a variety of inputs including mono and stereo 1/4", stereo rca and stereo 1/8" (3.5mm). The DB24 is an ideal impedance matching device for connecting any unbalanced stereo signal to a balanced system. Consumer audio equipment such as CD players, DVD players, MP3 players, etc., may be easily connected to a professional audio system.