Pioneer qx 646 owners manual
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Thank you for the confidence shown us in purchasing a Pioneer 4-channel receiver, model QX-646. This 4-channel solid state receiver will lead you into the exciting world of 4-channel sound in all its varieties: discrete 4-channel tapes or disc records (CD-4), regular matrix (RM) as well as SQ matrix records and broadcasts. lf you only have two speaker systems at the moment, the QX-646 will also serve LINE VOLTAGE AND FUSE The QX-646 is available in two models; one model operates only on L20V, and the other operates on one of the five line voltages; 110V, 1,20V,130V, 220Y and 240V. If your QX-646 is the latter model, set the unit to the proper line voltage by following the procedure described below. CHANGING LINE VOLTAGE SETTING AND FUSE To remove the fuse, turn the fuse cap located on the line voltage selector in the direction indicated by the arrow. Then remove the fuse plug from the unit. Put the fuse plug so that the proper line voltage marking can be seen through the cut in the edge of the plug. Whenever the position of the selector is changed, check the rating of the fuse. A l-ampere fuse is to be used for either 220Y or 240V operation and a 2-ampere fuse for 110V, 120V or 130V operation. If the rating of the fuse is correct, replace cap. FUSE REPLACEMENT If the fuse blows, remove the fuse cap and replace the fuse with a new one. 6a "b-qffiw: as a 2-channel receiver until you decide to step up into 4-channel sound by adding two more speaker systems. To develop its full potentials, the QX-646 must be com- bined with other components (speakers, turntable, tape deck) of equally high quality. Also, please study the fol- lowing operating instructions carefully to make full use of this receiver's many possibilities and features. CONTENTS LineVoltageandFuse ....2 QX-646 Features and Performance . . . . . . 3 Composition of a4-channelStereoSystem ..... 4 Hints for Operating CD-4DiscRecords ......5 Speaker Systems - PlacementandConnections . ... 6 Antennas and Ground Connections . . . . . 7 ConnectionofTapeDeck. ...... 8 Connectionof Turntable ... .....9 ConnectionDiagram ....... 9 FrontPanelFacilities.. ...11 PreparationsbeforeOperation ... 13 FMandAMReception.. ..74 RecordPlaying .....15 UsingtheAUXJack. .....15 BeforeCD-4RecordPlaying ... . . 15 UsingaTapeDeck. ...... L7 AboutCD-4Record .... ...... 18 Matrix4-channelDecoder ...... 19 Conditions Frequently Mistaken forMalfunction . .....20 Specifications... ..2L 2
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OX.646 FEATURES Combines All Current 4-channel System in One Unit Exciting 4-channel sound is yours in all four of its current varieties; discrete 4-channel from open-reel and cartridge tape, discrete 4-channel disc record (CO-+ Oisc record with an exclusive phono cartridge), RM (regular matrix) and SQ matrix records and broadcasts. Extracts 4-channel Sound from 2-channel Program Sources The built-in "regular matrix" circuit can convert regular 2-channel program sources (records, tapes, FM stereo) into wrap-around 4-channel sound, bringing to life the echo sound components found in practically any record, and giving your present stereo LPs a totally new and exciting sound. (lf you wish, you can play them in conventional 2-channel stereo fashion, too.) Accepts 2 Pairs of Rear Speakers The QX-646 can drive one pair of front plus two pairs of rear speakers, for a total of six speakers. The rear speakers can be turned on and off with a push-button. This makes it possible to have two different 4-channel speaker arrange- ments in the listening room and to select one according to program souces or personal preferences. Versatile Auxiliary Circuits and Control The QX-646 is fully equipped with auxiliary controls including speaker on/off and rear speaker A/B selector switches, a tape monitor switch, a headphone jack (for monitoring the front channels only), and terminals for 2-channel as well as 4-channel tape equipment. FET-equipped FM Tuner The FM tuner is equipped with an FET in its front end to improve selectivity and sensitivity. 'Also, the lF stage employs one hybrid dnd one monolithic lC, replacing numerous transistors, ceramic filters, etc., and raising the tuner's sensitivity and selectivity. The FM MPX decoder works according to the time switching system and boasts excellent channel separation. Tuning is made easy by the linear FM dial and the signal meter. Built-in AM Ferrite Bar Antenna Sensitive and highly directional. An outdoor AM antenna is not required in most cases. TJIONE€R Low-distortion Audio Amplifier Both tone controls and equalizatlon amplifier operate improved frequency response accuracy and flatness power amplifier is a quasi-complementary design, a and-true circuit construction. Looks as lmpressive as lt Sounds To this 4-channel receiver the word "compact" can not be applied - it is a rather large, impressive looking unit whose outward appearance already hints at its superb performance and versatility. The dial and meter section is easier to read. Your operation becomes much easier, complete with the program and mode indicator lighting up according to desired operation, and the unit comes installed in a natural walnut cabinet. PE RFORMANCE 4-Channel Stereo Performance With a 4-channel stereo tape deck or cartridge tape player installed, the QX-646 can provide a discrete 4- channel playback of programs recorded on tape. ln addi- tion, the QX-646 can reproduce a discrete 4-channel disc record with a stereo turntable equipped with an exclusive CD-4 phono cartridge. 4-channel Reproduction from Matrix 4-channel Source The self-contained matrix circuit permits 4-channel re- production from matrix 4-channel records or FM stereo broadcasts. The mode switch has positions for regular matrix and SQ matrix reproduction, allowing reproduction to take either of these forms. Matrix Reproduction from 2-channel Stereo Source A 2-channel signal from a record or FM stereo broadcast can be reproduced in 4-channel form via the regular or SQ matrix circuit. ln this case, the result is an improve- ment over ordinary 2-channel stereo reproduction. 2-channel Stereo Performance Conventional 2-channel stereo performance can be provided through an arrangement or two speaker systems in the front; left-side speaker system and right-side speaker sys- tem. for fhe ied- T tri t 3