Krell Industries KBL, Owner'S Manual

Page 1: ...KBL KPA OWNERS MANUAL ...

Page 2: ... important understanding of the functions and design features of the units Due to the high level of performance of which these units are capable careful placement and installation are crucial Your thorough understanding of the operations of the KBLand KPAwill help insure their maximum performance and long life ABOUT THE OWNERS MANUAL The KBL KPA Owner s Manual is divided into various groups of inf...

Page 3: ...tion throughout the manual Should you wish to change between stereo and monaural operation please refer to section D 5 This is only necessary whenchanging either unit from stereo to monooperation All KPAare shipped from the factory set up for stereo operation Please refer to section E 1 d for information regarding dual monooperation B GENERAL INFORMATION The KRELL KBL Krell Balanced Line and KPA K...

Page 4: ...e units are covered below and in the Installation and Operation sections The method used to switch a KBLor KPAfrom stereo to dual mono operation is unique For stereo operation each chassis has complete circuit paths for the left and right channels When switched to dual mono balanced operation the left channel circuitry is assigned to the non inverted path and the right channel circuitry is assigne...

Page 5: ...ent to compensate for systems of different efficiencies and for level differences in source components The KPAhas inputs for two different cartridges There is a front panel switch to adjust between the gains required for moving coil and moving magnet cartridges Adjustment for cartridge impedance loading is on the front panel as well Perhaps the most interesting features on the KPA are the front pa...

Page 6: ...should always be aware They are presented before the actual installation procedures should you not read through the Manualentirely a Wheninstalling the KBLalways connect the DCcable between the preamp chassis and the power supply before plugging the power supply into the ACmains b When installing a KBL KPAcombination connect the DC cables between the KPAand the KBL and between the power supply and...

Page 7: ...ion _T es For all terminations Makesure wire color and pin numbers match at both ends of the cable a Standard RCA Termination uses either coax cable or two conductor coaxial cable Center pin audio signal Outer ring ground when using two conductor coax cable one center conductor is connected to the outer ring at both ends the shield is connected to the outer ring at only one end This end should be ...

Page 8: ...wo KPAsand two KBLsoperating in dual mono d Balanced RCAto XLRTermination uses two conductor coaxial cable See drawing2 at the rear of the Manualfor details 2 prs RCA and I pr XLR connectors are used on each pair of audio cables The XLR end uses the termination detailed in section b above the RCA end uses the termination detailed in section c above Pin 2 on the XLR is the non inverted signal and i...

Page 9: ...1 2 Main on RCA Main on XLR Terminations male b male a male a male a female b One KPA 1 2 Main male a Unit s Inputs Outputs Termina 0n Two KBL B 1 B 2 S 1 S 2 S 3 S 4 Record 1 2 Main on RCA Main on XLR male b C c c female b Only the left connectors are operational in dual mono the right connectors are disabled Two KPA 1 2 e Two KPA Main c b Specific KPAto KBLCable Requirements Unit s One KPAto one...

Page 10: ...eqt0r are operational the right connectors are disabled All RCAconnectors remain operational but with different functions See section D3 Connector Terminations below for details b KBLIndicator LEDswitch The Symmetry LEDson the KBLcan be disabled Their function is unrelated to stereo or monooperation The switch located just forward of SW8 in the right rear of the unit controls this function Positio...

Page 11: ...with the supply s Plan the respective position of the supply s and preamplifier s within these distances Allow at least a small amount of cable to be excess so neither cable is pulled tight Contact the factory if the DC cable is too short Anyattempt to extend it jeopardizes the power supply and the preamp and will void the unit s warranty 3 Although well shielded the power supply s should not be p...

Page 12: ...ommodate a moving magnet or moving coil cartridge Single KPA connect the cartridge outputs to the KPA inputs 1 2 in the conventional manner Dual KPA balanced in ut wiring from the cartridge s connect the high left white right red output fromthe cartridge to the left input connectors on the KPAs Connectthe low left blue right green to the right input connectors on the KPAs Typically the top unit is...

Page 13: ...d KBLSelect switches should be set to Mute position and the KBL volumecontrol s should be fully counterclockwise Connect the KBLand KPA if a separate supply is being used for the KPA power supply s to the ACmains at this point The LED s on power supply s and on the preamplifier front panel s should illuminate Noneof the other LEDs should be illuminated at this point b Future Use The KBLand KPAare ...

Page 14: ...determine the setting for the most desirable sound quality Use the Gain switch to change the KPAbetween moving coil and moving magnet gain The LEDindicator will illuminate whenthe unit is set for moving magnet gain The switch con only be o uerated when the Select switch is in its Muteposition d Balanced The Balanced switch is used to change the unit from stereo to dual mono operation balanced when...

Page 15: ...n sources can cause damage to other components TheSelect switch is also used to choose the signal to be sent to the tape recorders via the Record outputs Whentwo KBLsare used in dual mono both Select switches must be set the same There is a Mutefunction at the 12 o clock position that should be used whensource material is being changed or whensource components are being turned on and off and at th...

Page 16: ...s 15 dB The LED indicator is illuminated whenthe switch is in the High position The switch can be changed during listening at low and moderate listening levels During high level listening it is advisable to lower the volumebefore adjusting the switch Use the Phase switch to reverse the absolute phase of the Mainoutputs The switch is functional for both the single ended and balanced outputs The LED...

Page 17: ...h channels at the same time TheLEDscan be disabled if desired See section D 5 above for details on turning off the LEDs Usethe level control to adjust the listening level Whentwo KBLsare used the level controls on the two preamps also control the balance betweenleft and right channels F WARRANTY The KBLand KPAhave a limited warranty of five years from the date of purchase Please return completed w...

Page 18: ...LDwire solder to white non inverting RCAcase SHIELDwire solder to red inverting RCAcase solder extra wires to shield for RCAground solder extra wires to shield for RCAground SHIELDwire solder to red inverting RCAcase SHIELDwire solder to white non inverting RCAcase BLACK inverting solder to red RCAcenter pin WHITE non inverting solder to white RCAcenter pin ...

Page 19: ...older to red RCAcenter pin C SHIELD wire solder to white non inverting RCAcase SHIELDwire solder to red inverting RCAcase solder extra wires to shield for RCAground solder extra wire to shield for XLRground SHIELD wire ground solder to Din i BLACK inverting solder to pin 3 on XLR WHITE non inverting solder to pin 2 on XLR I I L II NCEDXL R END on XLR ...

Page 20: ...r to RCA center pin SHIELDwire solder to non inverting RCAcase SHIELDwire solder to inverting RCAcase 1 solder extra wires to shield for RCAground solder extra wire to shield For ground Keep seperate from RCAcase BLACK inverting solder to RCAcase WHITE non inverting solder to RCAcenter pin 1 TURNTABLE END to Turntable ground i f necessary ...