Krell Industries manual Reconfiguringthe KAV-250a/3for Bridged Operation, See on page19

Page 25

IMPORTANT

Whenoperating the amplifier in bridged modeandusing an output device with single-ended RCAcables, be sure to removethe shorting pin from the/eft balanced XLRinput (4).

Reconfiguringthe KAV-250a/3for Bridged Operation

See Figure 6 on page19

Tools needed:T-15 Torx wrenchand two ribbon connection cables

1.Turn the KAV-250a/3off by pressing the powerbutton (14) on the front panel. The blue powerLED(15) extinguishes. Unplugthe ACpowercord from the IEC power connector(29) on the backpanel.

2.Usingthe T-15 Torx wrench,removethe 12 screwsthat securethe amplifier cover. Carefully removethe cover.

3.Locatethe small PCboard at the rear of eachamplifier channelandjumperpins labeled J4, J5, andJ6.

4.Option1: Tobridge left andcenter amplifier channels,connectoneendof the ribbon connectioncable to jumperpin J4 on the left amplifier channel(closest to the powersupply). Thecable snapsinto place. Connectthe other endof the ribbon connectioncable to jumperpin J6 on the center amplifier channel.

Option2: Tobridge center andright amplifier channels,connectoneendof the ribbon connectioncable to jumperpin J4 on the center amplifier channel.Connect the other endof the ribbon connectioncable to jumperpin J6 on the right amplifier channel.

5.Replacecover(slide the front panelendin first). Usingthe T-15Torx wrench, secure the 12 screws.

The KAV-250aJ3amplifier is nowready for bridged operation.

Connectingthe Bridged KAV-250a/3

See Figure 4 on page11

1.Whenthe left andcenter amplifier channelsare bridged (Option 1), connectthe output cable from the output device to the center balancedXLR(17) or single-ended RCA(20) input.

Connectthe positive loudspeakerlead (red) to the positive binding post on the center amplifier channel(23). Connectthe negativeloudspeakerlead (black) to positive bindingpost of the left amplifier channel(24).

KAV-250aand KAV-250a/3Amplifiers

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Contents Instructionsfor Use,v Owners Reference KAV-250a1999byKrell Industries, Inc. All rights reserved ContentsPage KAV-250aFront Panel IllustrationsPageDefinition of Terms IntroductionMulti AmpThroughput BridgingUnpacking AC Power Guidelines PlacementKAV-250a Frontpanel See on Front Panel Description KAV-250aKAV-250a BAK Panel 11 12 Inputs Back Panel Description KAV-250aOutputBridged Output Bridged+ AGC-12 FusesIEC Connector 11 12 VDCRemotePower Out 12 12 VDCRemotePower1415 KAV-250a/3 FrontpanelPower LED Power ButtonFront Panel Description KAV-250a/3 ZOO0 16, 17, 18 Inputs BackPanel Description KAV-250a/319, 20, 21 Inputs 22, 23, 24 OutputsIEC Power Connector 27 12 VDCRemotePower Out 28 12 VDCRemotePowerInput and Output Connections Before Reconfiguringfor MATor Bridged Operation Optional SystemConfigurationsLeftRight Reconfiguringthe KAV-250a Formator Bridgedoperati tNReconfiguring the KAV-250afor MAT Connecting the KAV-250a/3 Reconfigured for MAT PC boards SeeFigure 5 on page16 See on page19 Reconfiguringthe KAV-250a/3for Bridged OperationExamplesof Connectionscenarios KAV-250aand KAV-250aJ3Amplifiers Examplesof ConnectionScenarios Multi Power Mode ON/OFF and Operation Amplifier OperationHOW to Troubleshoot System Noise Amplifier TroubleshootingQuestion and Answer Warranty ReturnAuthorization Procedure KAV-250aStereo Amplifier SpecificationsKAV-250a/3Three-Channel Amplifier KAV-250a

KAV-250a/3 specifications

Krell Industries has long been a name synonymous with high-performance audio equipment, and the KAV-250a/3 is no exception. This power amplifier is designed to deliver an exceptional listening experience for audiophiles who demand both power and precision in their sound systems. The KAV-250a/3 integrates advanced technology and craftsmanship, earning its place in both home theater and high-fidelity audio systems.

One of the standout features of the KAV-250a/3 is its robust power output. With a staggering 250 watts per channel into 8 ohms, and an impressive 500 watts into 4 ohms, this amplifier is capable of driving even the most demanding speakers with ease. This allows for a dynamic range that brings music to life, making every note and subtle sound clearly audible.

The KAV-250a/3 employs Krell's proprietary CAST (Current Mode Amplification) technology. This technology minimizes distortion and enhances overall audio performance by allowing the amplifier to reproduce audio signals with minimal interference. The result is a sound that is both rich and detailed, providing a tactile listening experience that engages the listener fully.

In terms of build quality, the KAV-250a/3 stands out with its meticulously engineered chassis. It features a heavy-duty aluminum front panel and a solid steel chassis that not only provides durability but also helps reduce resonant vibrations that can affect sound quality. The design incorporates a cooling system with large heatsinks, ensuring that the amplifier remains cool even during extended listening sessions.

Additionally, the KAV-250a/3 includes multiple input options, allowing it to seamlessly integrate with various audio sources. It also features balanced XLR inputs, which provide increased noise rejection and signal integrity for high-end setups.

Krell’s commitment to delivering superior sound is evident in the KAV-250a/3's performance. It produces a sound stage that is both expansive and detailed, allowing users to hear nuances in their favorite recordings that may have gone unnoticed with lesser amplifiers. Overall, the Krell KAV-250a/3 embodies a fusion of power, technology, and craftsmanship, making it a top choice for audiophiles seeking an unparalleled audio experience.
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