Harman Kardon TC600 Owners Manual - Page 18

Audio input connections There are two types of input signals that your TC Series amplifier may receive: lowlevel (preamp-level) output or high-level (speaker-level) output. Low-level (preamp-level) connections Connect the left and right preamp output cables from your head unit, electronic crossover, low-level equalizer (commonly referred to as a passive equalizer), or preamplifier to the left and right INPUT RCA connectors on your TC Series amplifier. (See the "Controls and operations" section for information about adjusting input level.) You may want to use high-quality preamp cables (although noise at this point should not be a factor because the differential INPUT connectors on the TC Series amplifiers are capable of rejecting radiated noise induced in cables). If you decide to use higher-quality preamp cables. use the type with a shielded, twisted pair of signal wires, if possible. The separate shield should not be grounded at the amplifier end.