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Krell Industries Preamplifier KBL manual

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Table of contents for the manual

  • Page 1

    KBL & KPA OWNERS’ MANUAL[...]

  • Page 2

    45 Connair Road Orange, CT 06477-0533, USA KBL & KPA OWNERS’ MANUAL INTRODUCTION Thank you for your purchase of a new KRELL preamplifier. This Owners’ Manual covers both the KBL and KPA preamplifiers, as they have been designed to be companion pieces and can be utilized in varying combinations. For each user there will be information that d[...]

  • Page 3

    D. Installation: 1. Caution 2. Connector Details 3. Connector Termination Types 4. Cable Requirements for Inputs and Outputs 5. Setting of Internal Switches 6. Unit Location Guidelines and Installation 7. Connection of Inputs and Outputs 8. Turn-on of the Preamplifiers E. Operation: 1. KPA Functions 2. KBL Functions F. ,W~rranty ~nd Service Informa[...]

  • Page 4

    These units are the current state-of-the-art. No compromise was allowed in their design. Details concerning their technical performance are covered in more detail below, A second important consideration was to introduce the programmable concept employed in our current KSA/KMA amplifier line into our preamplifier line. A single KBL and KPA are used [...]

  • Page 5

    Both preamplifiers have innovative operational features. The KBL has two balanced inputs and one set of balanced outputs in addition to four single- ended inputs and one set of single-ended outputs. This allows one KBL to accommodate balanced line sources and amplifiers, which Krell believes to be the standard for high-end audio gear. Therefore, it[...]

  • Page 6

    1 KP~ without _vower supvlv 1 each: preamplifier chassis DC jumper cable (KBL to KPA) "T" shaped Allen driver Owner’s Manual 1 KPA with ~ower su~pl_v 1 each: preamplifier chassis KPA power supply with AC and DC cables attached DC jumper cable (KBL to KPA) *not used when the dedicated KPA supply is used* "T" shaped Allen driver[...]

  • Page 7

    2. Connector Details This section, with sections 3 & 4 below, presents all details necessary to make or modify cables for use with all combinations of the KBL and KPA. After reading these sections, check all the cables you intend to use to make sure they are appropriate for your installation. a..Gener~:[ .. Information Different configurations [...]

  • Page 8

    All Krell Industries and Krell Digital products use this pin-out for inputs and outputs. c. Balanced RCA Terminatiom uses two-conductor coaxial cable: See Drawing 1 at the rear of the Manual for details. 1 pr. of RCA connectors are used on each end of the cable with this termination; 4 prs. total are used if this termination is used at both ends. R[...]

  • Page 9

    Read the portions of sections a and b below that pertain to your system for the specific cable terminations required. If you are adding to your system you may need to change some cable terminations to take full advantage of dual-mono, balanced operation. ao S_vstem Confi~urationfl~ermination s Unit(s) Inputs One KBL B-1 & B-2 S-l, S-2, S-3, S-4[...]

  • Page 10

    Please read this section to determine if you have the need or desire to change the internal switches. a. KBL Stereo~D~al-M0n0 ~witches These switches are used to change the KBL between stereo and mono operation. Their most common use is to change an existing KBL from stereo to dual-mono when installing a second KBL for dual-mono. There is one doubl[...]

  • Page 11

    Four inches clearance should be allowed above the top of either the KBL or KPA. Only a small amount of clearance is needed on the sides. Four to six inches clearance should be allowed at the rear of either unit to provide for cables. 3. The units can be stacked. KPA(s) should be placed on the bottom with KBL(s) on top. KPA(s) are sensitive to induc[...]

  • Page 12

    d. Power Supply Installation 1. Place the power supply(s) in location. 2. Connect the DC cable(s) from the supply(s)to the preamp(s) 3. Plug the DC jumper between the KBL(s) and KPA(s). 4. Do not plug the AC connector(s) into the mains at this time. 7. Connection of Inputs and Outputs All source components and amplifiers should be off at this point[...]

  • Page 13

    b. Connection of KBL Record Outputs There are two Record outputs which receive the signal from the input chosen on the Select switch for sending to two tape recorders. The two outputs are wired in parallel and have no relation to any of the inputs. Make the connections between the Record outputs and tape recorders at this time. c. Connection of the[...]

  • Page 14

    E. OPERATION 1. KPA Functions Use the Select switch to choose between two different cartridges or tonearms. If the two inputs are not the same type cartridge be sure to change the gain with the Gain switch to avoid any overload conditions. See section c below. b. LQading Use the Loading switch to adjust the impedance load for the selected cartridge[...]

  • Page 15

    This switch can be operated while listening to the KPA at normal levels without risk of damage to the preamplifier, amplifier(s) or speakers. Its setting is a matter of personal taste. f. RIAA Adjustment. 20 KHZ Use this switch to make subtle adjustments to the high end of the RIAA equalization curve. The LED indicator will illuminate when the swit[...]

  • Page 16

    Input B-2 on the Monitor switch uses only the non-inverted signal. Therefore, if you are feeding a balanced signal into B-2, there will be a 6 dB difference in level between B-2 on the Select switch and on the Monitor switch. The level on the Select switch will be the higher one. Note: Be careful not to create a feedback loop between the KBL an tap[...]

  • Page 17

    When the control is turned clockwise the left channel is attenuated; when turned counterclockwise the right channel is attenuated. The LED indicators may illuminate at high listening levels. This indicates that a level difference exists between the left and right channels at that moment. This can be disregarded unless there is an audible channel im[...]

  • Page 18

    Balanced RCA [o RCA cable wiring diagram Drawing I, Termination c. (WHITE) non-inverting: solder to white RCA center pin ~,. (BLACK) inverting:L~..., solder to red RCA center ELD wire): solder to white non-inverting RCA case (SHIELD wire): solder to red inverting RCA case solder extra wires to shield for RCA ground solder extra wires to shield[...]

  • Page 19

    Balanced RCA Lo XLR cable wiring diagram Drawing 2, Termination d. BA L A NCED R CA END (WHITE) non-inverting: solder to white RCA center pin BLACK) inverting: solder to red RCA center pin ~ ,~C. ,(SHIELD wire): solder to white non-inverting RCA case (SHIELD wire): solder to red inverting RCA case solder extra wires to shield for RCA ground solder [...]

  • Page 20

    Balanced KPA cable wiring diagram Drawing 3, Termination e. B~I L A NCED KPA END (WHITE) non-inverting: solder to RCA center ., (,,BLACK) inverting: solder to RCA center pin ’" "’~ (SHIELD wire): solder to non-inverting RCA case : (SHIELD wire): solder to inverting RCA case / / 1/ solder extra wires to shield for RCA ground solder ex[...]