Inverse RIAA network

Many people find that when they want to add a CD player to their aud io system, there is no available input left on their power amplifier. It seems obvious to use the phono input. but that presents a coupIe of problems. This input ls far too sensitive for a CD player and, moreover, it passes the signal via an RIAA frequency correction network to the amplifier. The present network can salve both problems without any internal changes to the audio system, since it ts merely plugged into the phono input socket.