18CONNECTIONSConnecting to an ExternalAmplifierIf you want to increase the power output to the speakers,or want to use another amplifier, connect an externalamplifier to the PRE OUT/MAIN IN jacks as follows.Note• When RCA pin plugs are connected to the PRE OUT/MAININ jacks for output to an external amplifier, it is not necessaryto use the corresponding SPEAKERS terminals.1 MAIN OUT/IN jacksMAIN OUT jacks .... Main channel line output jacks.The signals output through thesejacks are affected by VOLUME,BASS, TREBLE, and BASSEXTENSION settings.MAIN IN jacks ........ Line input to this unit’s Mainchannel amplifiers.When connecting to these jacks, signals input to thepreamplifier of this unit will not be output from the mainamplifier of this unit.2 REAR CENTER jackRear center channel line output jack.3 CENTER jackCenter channel line output jack.4 SUBWOOFER jackWhen using a subwoofer with built-in amplifier, includingthe YAMAHA Active Servo Processing SubwooferSystem, connect the input jack of the subwoofer systemto this jack. Low bass signals distributed from the main,center and/or rear channels are directed to this jack if theyare assigned to this jack. (The cut-off frequency of thisjack is 90 Hz.) The LFE (low-frequency effect) signalsgenerated when Dolby Digital or DTS is decoded are alsodirected if they are assigned to this jack.Notes• Adjust the volume level of the subwoofer with the control onthe subwoofer. It is also possible to adjust the volume level byusing the remote control of this unit (see ADJUSTING THELEVEL OF THE EFFECT SPEAKERS on page 61).• Depending on the settings of “1 SPEAKER SET” and “10 LFELEVEL” on the SET MENU, some signals may not be outputfrom the SUBWOOFER jack.5 REAR (SURROUND) jacksRear channel line output jacks.PRE OUT/MAIN INMAIN OUT MAIN IN REAR (SURROUND)SUBWOOFERCENTERREARCENTERRLRL1 23 4 5Connecting an External DecoderThis unit is equipped with 6 additional input jacks (leftand right MAIN, CENTER, left and right SURROUNDand SUBWOOFER) for discrete multi-channel input froman external decoder, sound processor or pre-amplifier.Connect the output jacks on your external decoder to the6CH INPUT jacks. Be sure to match the left and rightoutputs to the left and right input jacks for the main andsurround channels.Notes• When you select 6CH INPUT as the input source, this unitautomatically turns off the digital sound field processor, andyou cannot listen to DSP programs.• When you select 6CH INPUT as the input source, settings of“1 SPEAKER SET” on the SET MENU do not apply (exceptfor 1F MAIN LEVEL).