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KAV-250a
Stereo Power Amplifier
Leader in Audio Engineering
KAV-250a/3
Three-Channel Power Amplifier
Instructions for Use, v 99.2
Owner’s Reference
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KAV-250a Stereo Power Amplifier and KAV-250a/3 Three-Channel Power Amplifier Instructions for Use, v 99.2 Cover: KAV-250a/3 Three-Channel Power Amplifier Krell Industries, Inc. 45 Connair Road Orange, CT 06477-3650 USA TEL 203-799-9954 FAX 203-799-9796 E-MAIL krell @ krellonline.com WEBSITE http://www.krellonline.com This product complies with the EMC directive (89/336/EEC) and the low-voltage directive (73/23/EEC). WARNINGS The amplifier must be placed on a firm, level surface where it is not e
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Page Contents 1 INTRODUCTION ’ 1 DEFINITION OF TERMS UNPACKING 2 PLACEMENT 3 AC Power Guidelines 3 FRONT PANEL DESCRIPTION: KAV-250a 5 BACK PANEL DESCRIPTION: KAV-250a 7 FRONT PANEL DESCRIPTION: KAV-250a/3 10 12 BACK PANEL DESCRIPTION: KAV-250a/3 CONNECTING THE KAV-250a or KAV-250aJ3 AMPLIFIER 14 TO YOUR SYSTEM Input and Output Connections 14 OPTIONAL SYSTEM CONFIGURATIONS 15 15 Multi Amp Throughput 20 Bridged Operation 22 Examples of Connection Scenarios AMPLIFIER OPERATION 25 On/Off and Operat
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Illustrations Page FIGURE 1 The KAV-250a Front Panel 4 FIGURE 2 The KAV-250a Back Panel 6 FIGURE 3 The KAV-250a/3 Front Panel 9 FIGURE 4 The KAV-250a/3 Back Panel 11 Reconfiguring the KAV-250a for MAT FIGURE 5 or Bridged Operation 16 FIGURE 6 Reconfiguring the KAV-250a/3 for MAT or Bridged Operation 19 iv KAV-250a and KAV-250a/3 Amplifiers
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Introduction Thank you for your purchase of the Krell KAV-250a Stereo Power Amplifier or KAV-250a/3 Three-Channel Power Amplifier.. The KAV-250a and KAV-250aJ3 amplifiers provide substantial two- and three-channel output power that delivers realistic music production at an exceptional value. These amplifiers can be customized with a variety of optional system configurations: Multi Amp Throughput (MAT), bridged operation, and high power mono operation. These options provide a wider range of power
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Unpacking Open the shipping box, which contains: 1 amplifier unit (packed in foam end-caps) 2 ribbon connection cables KAV-250a fuses: 2 AGC-8 (~ ’amp) 1 slow-blow (20 amp for 100/120 V or 12 amp for 220/240 V) or KAV-250a/3 fuses: 3 AGC-.8 ~ amp) 1 slow-blow (20 amp for 100/120 V or 12 amp for 220/240 V) 1 12 VDC output (12 V trigger) cable 1 IEC connector (AC power) cord 1 T-15 Torx wrench 1 packet containing the owner’s reference manual and the warranty registration card. Grasp the underside
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Placement Before you integrate the KAV-250a or KAV-250a/3 into your system, review the following guidelines to choose the location for the component. This will facilitate a clean, trouble-free installation. The KAV-250a and KAV-250aJ3 require at least two inches (5 cm) of clearance each side and at least two inches (5 cm) of clearance above the component to provide adequate ventilation. Your amplifier does not require any type of special rack or cabinet for installation. For the dimensions of y
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FIGURE 1 THE KAV-250a FRONT PANEL 1 2 1 Power Button 2 Power LED
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Front Panel Description: KAV-250a See Figure 1 on page 4 1 Power Button Use this button to turn the KAV-250a power on and off and also to switch the 12 VDC output (12 V trigger) on and off. 2 Power LED The blue power LED illuminates when the amplifier is on. KAV-250a and KAV-250a/3 Amplifiers 5
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FIGURE 2 THE KAV-250a BA(;K PANEL 5 11 12 10 13 Balanced Inputs Fuses 3 Right Input 9 AGC~ Fuses 4 Left Input (Bridged) 10 Line Fuse Single-ended Inputs Remote Controls 5 Right Input 11 12 VDC Remote Power Out 6 Left Input (Bridged) 12 12 VDC Remote Power In Amplifier Channel Outputs Power 7 Right Output (Bridged-) 13 IEC Power Connector 8 Left Output (Bridged+)
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Back Panel Description: KAV-250a See Figure 2 on page 6 The KAV-250a back panel provides connections for all inputs and outputs, remote control input and output links, and AC power supply. Inputs and outputs labeled left and right are on the left and right side of the amplifier, respectively, when viewing the amplifier from the front panel. Balanced Inputs 3, 4 Inputs These are the right (3) and the left (4) KAV-250a channel inputs for output devices balanced XLR connectors. Single-ended Inputs
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Back Panel Description, continued Remote Controls 11 12 VDC Remote Power Out 12 12 VDC Remote Power In The KAV-250a is equipped with an output that sends 12 VDC power on/off (12 trigger) signals to other Krell components and other devices that incorporate 12 V trigger. This allows you to turn the KAV-250a on and off using a Krell or other component in a custom installation. Notes 12 VDC Out/in (12 V trigger) remote power is limited to 30 ma. Consult the owner’s manual of any component used in
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THE KAV-250a/3 FRONT PANEL FIGURE 3 14 15 14 Power Button 15 Power LED
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Front Panel Description: KAV-250a/3 See Figure 3 on page 9 14 Power Button Use this button to turn the KAV-250a/3 power on and off and also to switch the 12 VDC output (12 V trigger) on and off. 15 Power LED The blue power LED illuminates when the amplifier is powered on. KAV-250a and KAV-250a/3 Amplifiers 10
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FIGURE 4 THE KAV-250a/3 BACK PANEL 16 19 17 2o 18 21 25 22 25 23 25 24 27 28 26 29 Balanced Inputs Fuses 16 Right Input 25 AGC e~Euses ~-----’~ 17 Center Input 26 Line Fuse 18 Left Input ZOO0. Remote Controls Single-ended Inputs 27 12 VDC Remote Power Out 19 Right Input 28 12 VDC Remote Power tn 20 Center Input 21 Left Input Power 29 IEC Power Connector Amplifier Channel Outputs 22 Right Output 23 Center Output 24 Left Output
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Back Panel Description: KAV-250a/3 See Figure 4 on page 11 The KAV-250a/3 back panel provides connections for all inputs and outputs, remote control input and output links, and AC power supply. Inputs and outputs labeled left and right are on the left and right side of the amplifier, respectively, when viewing the amplifier from the front panel. Balanced Inputs 16, 17, 18 Inputs These are the right (16), center (17), and left (18) KAV-250a/3 channe~ inputs output devices with balanced XLR conne
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Back Panel Description, continued Note Fuses must be replaced with the fuse value specified on the KA V-250a/3 back panel Use a 20 amp slow-blow line fuse for 100/120 V systems or a 12 amp slow-blow line fuse for 220/240 V systems. Remote Controls 27 12 VDC Remote Power Out 28 12 VDC Remote Power In The KAV-250a/3 is equipped with an output that sends 12 VDC power on/off (12 trigger) signals to other Krell components and other devices that incorporate 12 V trigger. This allows you to turn the
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Connecting the KAV-250a or KAV-250a/3 Amplifier to Your System INPUT AND OUTPUT CONNECTIONS The following steps describe how to connect cables to the KAV-250a or KAV-250a/3 amplifier. 1. Neatly arrange and organize the wiring to and from the amplifier and all components. Separate AC wires from audio cables to prevent hum or other unwanted noise from being introduced into the system. 21 Connect the loudspeaker cables to the KAV-250a amplifier channel output speaker binding posts (7, 8), or the KA
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Optional System Configurations The KAV-250a and KAV-250a/3 can be reconfigured for either Multi Amp Throughput (MAT) or bridged operation. IMPORTANT Removing the cover to reconfigure for MA T or for bridged operation is the ONL Y instance you are authorized to remove the cover of ANY Kre// component without voiding your Warranty. For more information on product/imitations and restrictions, see Warranty, on page 28. Before Reconfiguring for MAT or Bridged Operation Read the following important sa
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FIGURE 5 RECONFIGURING THE KAV-250a FOR MAT OR BRIDGED OPERATI( tN Left Right PC boards showing MAT jumper configuration Right Left PC boards showing bridged jumper configuration Power supply PC boards Right 16 KAV-250a and KAV-250-a/3 Amplifiers
