Harman Kardon HK930 Owners Manual - Page 12

SPEAKER SYSTEM SELECTOR SWITCHES Your receiver has been provided with two independent speaker selector switches. If your receiver is connected with one set of speakers (1 system) as described in previous paragraph on speaker connections, the SPKR-1 switch must be in the "on" position. If you have 2 sets of speakers (2 systems) the SPKR-1 and SPKR-2 switches must both be in the "on" position for both systems to operate. Should you desire to listen to stereo headphones alone, the speakers (either one or both systems) can be turned off at your discretion. TAPE MONITOR SWITCHES 1 and 2 Your receiver is provided with two pairs of TAPE OUT receptacles to permit recording of program material being reproduced by your stereo system. If your tape recorder is of the professional type and has a third head for "monitoring", it is possible to compare the recording with the original while it is being made. Simply push the appropriate TAPE MONITOR switch (depending on which TAPE MON receptacles you are using) to the IN position to listen to the recording after it has been made and back to the OUT position to listen to the program material you are recording. If you have two professional recorders, each with a monitoring feature, you may monitor each one individually. However, if both TAPE MONITOR switches are IN, TAPE MONITOR 2 will take preference to prevent mixing of both channels. HIGH CUT FILTER SWITCH The HIGH CUT FILTER has been designed to reduce the high frequency response of your receiver. This will reduce annoying record scratch, tape hiss, FM background noise, etc. LOW CUT FILTER SWITCH At times, record changes, turntables and even some FM stations produce an objectionable low frequency signal that is strong enough to be introduced into the playback system. This is known as rumble and can be cancelled out by the special low frequency cut off filter network included in this receiver. Whenever rumble is present throw the LOW CUT switch "IN". TONE DEFEAT SWITCH This switch permits you to remove the tone controls from the circuit to provide an absolutely linear response. You may use this switch for instant comparison of program material with either an equalized or flat response. CONTOUR SWITCH One of the limitations of human hearing is its tendency to lose sensitivity to the very low pitched sounds as the program sound level is reduced. It is this characteristic (known as the Fletcher-Munson effect) which causes one to play music programs at high listening levels in order to experience the full rich tone available from fine modern recordings. The Harman-Kardon CONTOUR switch compensates for this effect; thereby eliminating high listening levels as a requisite for full enjoyment of reproduced music. For warm, full-bodied reproduction at low listening levels, throw the CONTOUR switch to the IN position. At high levels, the CONTOUR switch has no effect. FM MUTING SWITCH The purpose of the muting circuit is to reduce audible noise when tuning from station to station. Since very weak signals may be muted at the same time, the front panel FM MUTING switch may be used to defeat the muting circuit on weak signals. To reduce interstation noise, throw the MUTING switch "ON". To defeat the circuit, throw the switch "OFF". MPX FILTER SWITCH As FM multiplex reception requires greater signal strength at the antenna terminals than monophonic reception, transmissions from weak or distant stations will contain more noise than a monophonic signal of the same strength. This switch will eliminate noise accompanying these weak multiplex signals. STEREO AUTO SWITCH Under normal use for all FM broadcasts the function selector switch should be placed in the FM position and the stereo auto switch to the IN position. Your receiver is equipped with a stereo sensing circuit which will automatically determine whether your unit is receiving monophonic or stereophonic broadcasts, and then automatically adjust the mode of operation. If the station is transmitting stereo, your receiver will automatically switch on the multiplex section and you will hear the broadcast in full stereo. Should the station conclude broadcasting in stereo, your receiver will automatically switch back to monophonic reception. Should you receive a weak stereo signal whose quality has been degraded by noise or poor signal conditions, and you wish to listen to this stereo broadcast monophonically, place the stereo auto switch in the OUT position. 11