One set of two SPEC RSP-101 high end audio Real-Sound Processors in a very good condition. The Real Sound processor RSP-101 can bring out the full potential of your speakers, delivering realistic sound and rich musicality. Simply connect to the speakers and improve the sound quality of your audio equipment. Best results are with solid-state amplifiers. By connecting each speaker to a RSP-101, much of counter electromotive force is absorbed and it reduces the impedance change of the speaker from the mid high frequency band in particular. As a result, the speaker is driven accurately and can improve the resolution and the “control” of the music. Serial numbers are 00113 and 00114. The Check our other listings for more interesting items. Free shipping worldwide!