Related Manuals for Krell Industries Three-Channel Power Amplifier KAV-250a/3
Summary of Contents for Krell Industries Three-Channel Power Amplifier KAV-250a/3
- Page 1 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...
- Page 2 This product is manufactured in the United States of America. Krell ® is a registered trademark of Krell Industries, Inc., and is restricted for use by Krell Industries, Inc., its subsidiaries, and authorized agents. Multi Amp Throughput is a trademark of Krell Industries, Inc.
-
Page 3: Table Of Contents
Contents INTRODUCTION ’ DEFINITION OF TERMS UNPACKING PLACEMENT AC Power Guidelines FRONT PANEL DESCRIPTION: KAV-250a BACK PANEL DESCRIPTION: KAV-250a FRONT PANEL DESCRIPTION: KAV-250a/3 BACK PANEL DESCRIPTION: KAV-250a/3 CONNECTING THE KAV-250a or KAV-250aJ3 AMPLIFIER TO YOUR SYSTEM Input and Output Connections OPTIONAL SYSTEM CONFIGURATIONS Multi Amp Throughput Bridged Operation... - Page 4 Illustrations FIGURE 1 The KAV-250a Front Panel FIGURE 2 The KAV-250a Back Panel FIGURE 3 The KAV-250a/3 Front Panel FIGURE 4 The KAV-250a/3 Back Panel Reconfiguring the KAV-250a for MAT FIGURE 5 or Bridged Operation FIGURE 6 Reconfiguring the KAV-250a/3 for MAT or Bridged Operation Page KAV-250a and KAV-250a/3 Amplifiers...
-
Page 5: Introduction
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. -
Page 6: Unpacking
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) 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... -
Page 7: Placement
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. -
Page 8: Figure 1 The Kav-250A Front Panel
FIGURE 1 THE KAV-250a FRONT PANEL 1 Power Button 2 Power LED... -
Page 9: Front Panel Description: Kav-250A
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. -
Page 10: Figure 2 The Kav-250A Back Panel
FIGURE 2 THE KAV-250a BA(;K PANEL Balanced Inputs 3 Right Input 4 Left Input (Bridged) Single-ended Inputs 5 Right Input 6 Left Input (Bridged) Amplifier Channel Outputs 7 Right Output (Bridged-) 8 Left Output (Bridged+) 11 12 10 Fuses 9 AGC~ Fuses 10 Line Fuse Remote Controls 11 12 VDC Remote Power Out... -
Page 11: Back Panel Description: Kav-250A
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. - Page 12 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.
-
Page 13: Figure 3 The Kav-250A/3 Front Panel
THE KAV-250a/3 FRONT PANEL FIGURE 3 14 15 14 Power Button 15 Power LED... -
Page 14: Front Panel Description: Kav-250A/3
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. -
Page 15: Figure 4 The Kav-250A/3 Back Panel
FIGURE 4 THE KAV-250a/3 BACK PANEL 25 22 25 23 Balanced Inputs 16 Right Input 17 Center Input 18 Left Input Single-ended Inputs 19 Right Input 20 Center Input 21 Left Input Amplifier Channel Outputs 22 Right Output 23 Center Output 24 Left Output 25 24 Fuses... -
Page 16: Back Panel Description: Kav-250A/3
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. - Page 17 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...
-
Page 18: To Your System
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. -
Page 19: Optional System Configurations
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. - Page 20 FIGURE 5 RECONFIGURING THE KAV-250a FOR MAT OR BRIDGED OPERATI( tN PC boards showing MAT jumper configuration PC boards showing bridged jumper configuration Power supply Left Left KAV-250a and KAV-250-a/3 Right Right PC boards Right Amplifiers...
- Page 21 Reconfiguring the KAV-250a for MAT See Figure 5 on page 16 Tools needed: T-15 Torx wrench and one ribbon connection cable 1. Turn the KAV-250a off by pressing the power button (1) on the front panel. The blue power LED (2) extinguishes. Unplug the AC power cord from the IEC power connector (13) on the back panel.
- Page 22 5. Connect one end of the second ribbon connection cable to jumper pin J4 on the center amplifier channel. Connect the other end of this ribbon connection cable to jumper pin J5 on the right amplifier channel. 6. Replace the cover (slide the front panel end in first). secure the 12 screws.
-
Page 23: Figure 6 Reconfiguring The Kav-250A/3 For Mat Or Bridged Operation
FIGURE 6 RECONFIGURING THE KAV-250a/3 FOR MAT OR BRIDGED OPERATION PC boards showing MAT jumper configuration PC boards showing bridged jumper configuration (See Option 1, on page 21) PC boards showing bridged jumper configuration (See Option 2, on page 21) Power supply KAV-250a and KAV-250-a/3... -
Page 24: Bridged Operation
BRIDGED OPERATION The KAV-250a and the KAV-250a/3 can be reconfigured for bridged operation. When the KAV-250a amplifier’s channels are bridged, the amplifier’s output power is quadrupled: the amplifier delivers 1,000 Watts to an 8 Ohm load. The KAV-250a/3 can be reconfigured to bridge any two of its three amplifier channels to operate as one combined amplifier channel. - Page 25 IMPORTANT When operating the amplifier in bridged mode and using an output device with single-ended RCA cables, be sure to remove the shorting pin from the/eft balanced XLR input (4). Reconfiguring the KAV-250a/3 for Bridged Operation See Figure 6 on page 19 Tools needed: T-15 Torx wrench and two ribbon connection cables 1.
-
Page 26: Examples Of Connection Scenarios
2. When the center and right amplifier channels are bridged (Option 2), connect the output cable from the output device to the right balanced XLR (16) or single-ended RCA (19)input. Connect the positive loudspeaker lead (red) to the positive binding post on the (right) amplifier channel (22). - Page 27 Examples of Connection Scenarios, Power Biamplification (Stereo, Power biamplification uses the MAT feature of the KAV-250a to send the same music signal to all amplifier channels using one balanced or single-ended input connection. When the KAV-250a is reconfigured for MAT, one channel of the amplifier powers the Ioudspeaker’s high frequency end, and the other channel powers the Ioudspeaker’s low frequency end.
- Page 28 Examples of Connection Scenarios, Multi Power Mode Multi power mode uses the KAV-250a/3’s MAT feature to independently power multiple pairs of stereo loudspeakers to extend the listening environment throughout your home. When the KAV-250a/3 is reconfigured for MAT, each channel powers an individual loudspeaker, with one KAV-250a/3 dedicated to driving outputs to the left loudspeakers and one KAV-250a/3 driving outputs to the right loudspeakers.
-
Page 29: Amplifier Operation
Amplifier Operation ON/OFF AND OPERATION When powering up your system, turn amplifiers on last. When powering down your system, turn amplifiers off first. The procedures for amplifier operation follow. 1. Press the KAV-250a power button (1) or KAV-250a/3 power button (14) on amplifier’s front panel. -
Page 30: Amplifier Troubleshooting
Amplifier Troubleshooting HOW TO TROUBLESHOOT SYSTEM NOISE When you mix and match audio components, each with its own ground potential, a low frequency hum may occur in one or both loudspeakers. This often occurs when introducing a new component into a system. If a low frequency hum emanates from the loudspeakers when you place the KAV- 250a stereo or KAV-250a/3 three-channel amplifier into your system, follow these simple troubleshooting steps. -
Page 31: Question And Answer
Question and Answer Q. Should I leave the KAV-250a or KAV-250a/3 amplifier on at all times? A. No. These amplifiers do not have a stand-by mode. Leaving them on at all times would result in considerable heat output and power consumption. For best results, turn the amplifier off when not in use, and allow a five minute warm-up after it is turned on. -
Page 32: Warranty
Warranty The KAV-250a and KAV-250a/3 amplifiers have. a limited and transferable warranty of five years for parts and labor on cimuitry. Should this product fail to perform at any time during the warranty, Krell will repair it at no cost to the owner, except as set forth in this warranty. -
Page 33: Return Authorization Procedure
Return Authorization Procedure If you believe there is a problem with your component, please contact your dealer, dis- tributor, or the Krell factory to discuss the problem before you return the component for repair. To expedite service, you may wish to complete and e-mail the Service Request Form in the Service Section of our website http://www.krellonline.com... -
Page 34: Specifications
Specifications KAV-250a Stereo Amplifier FREQUENCY RESPONSE SIGNAL TO NOISE RATIO "A" WEIGHTED TOTAL HARMONIC DISTORTION (THD) GAIN INPUT IMPEDANCE INPUT SENSITIVITY OUTPUT VOLTAGE OUTPUT POWER, EACH CHANNEL DRIVEN BRIDGED POWER CONSUMPTION INPUTS OUTPUTS DIMENSIONS WEIGHT 20 Hz to 20 kHz +0 dB, -0.1 dB 0.4 Hz to 170 kHz +0 dB, -3 dB... - Page 35 KAV-250a/3 Three-Channel Amplifier FREQUENCY RESPONSE SIGNAL TO NOISE RATIO "A" WEIGHTED TOTAL HARMONIC DISTORTION (THD) GAIN INPUT IMPEDANCE INPUT SENSITIVITY OUTPUT VOLTAGE OUTPUT POWER, EACH CHANNEL DRIVEN BRIDGED POWER CONSUMPTION INPUTS OUTPUTS DIMENSIONS WEIGHT All operational features, functions, specifications, and policies are subject to change without notification.
- Page 36 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.krellon line.corn KAV-250a Stereo Power Amplifier KAV-250a/3 Three-Channel Power Amplifier...