Krell Industries EVOLUTION TWO MONAURAL PREAMPLIFIER manual Troubleshooting System Noise

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(SECTION EIGHT: Questions and Answers continued)

Troubleshooting System Noise

When you mix and match high-performance audio components, each with its own ground potential, a low frequency hum may occur in one or both loudspeakers.

If this happens when you place the Evolution Two preamplifier into your system, follow these simple troubleshooting steps.

1.Check that all input and output connections are of sound construction.

2.With the preamplifier channel off, remove the interconnect cables, the turn the preamplifier channel on. If the hum disappears, turn the preamplifier channel off and reinsert one of the interconnect cables. Turn the preamplifier channel back on. Repeat this process for each cable.

3.If the hum reappears with one or both interconnect cables reinserted, the cable needs to be replaced.

4.If the interconnect cables are sound, you may be experiencing a ground loop. Please contact your authorized Krell dealer, distributor, or Krell for suggestions on how to eliminate the ground loop.

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Contents Evolution Page Contents List of Illustrations Letter from Dan D’Agostino Letter from Dan D’Agostino About Krell Krell LegacyRevolutionary Krell Cast Technology Voltage Signal Transmission Traditional Audio SystemHow Cast and Krell Current Mode Interact Cast BasicsCast Cable Construction Evolution CastBest Musical Performance Zero Feedback Balanced Current Mode Design Ensuring Maximum PerformanceCore Technologies Fully Balanced Discrete Volume Control Separate Power SupplyAdvanced Microprocessor Control Custom Software Configurations Definition of TermsInputs and Outputs Operation Krell Current ModePreamplifier TechnologyLeft/Right Channel Orientation Unpacking and PlacementOpening the Evolution Two Shipping Carton To Remove the Preamplifier Channel from the Shipping CartonPlacement AC Power GuidelinesRepeat Steps 1-5 for the remaining preamplifier channels Connecting the Evolution Two to Your System Quick StartOperating the Evolution Two Linked Mode Anatomy of an Evolution Two 11 12 13Evolution Two Remote Control Chassis PowerFront Panel Description Remote Functions on the Front PanelPreamplifier Functions DisplayMenu Button or Key Level ControlNavigate/Customize Enter Button or KeyRemote Control Description Battery Installation and RemovalCompact Disc Functions Amplifier FunctionsIEC Power Cord Receptacle Outputs Back Panel DescriptionInputs 35, 36 Main Bus Outputs42 RC-5 Remote Connections on the Back Panel37, 38 Record Bus Outputs 43 RS-232Phono Stage Connector Link ControlInput and Output Connections Connecting the Evolution Two to Your SystemXLR Pin Configuration Connection StepsNever connect two power supplies together Connections Using can Link To Connect Multiple Evolution Two Preamplifiers via can LinkOn/Off and Stand-by Operation Linked Mode Evolution Two OperationPlay and Record To Turn Off Your SystemOperation Using can Link Customizing the Evolution Two Navigation ConventionsBacklight Menu FunctionsAC Mains Enter the menu, thenBalance Channel AssignUse to make a left channel respond as a right channel Clone Use to make a right channel respond as a left channelDisplay Info Front panel display is always onFront panel display times out after 5 seconds Input Level Trim Input NameTo select input names for other inputs, repeat Steps 3 Phase of the selected input is inverted 180 degrees Input PhasePhase of the selected input is unaffected Input TriggerEvolution Two responds to 12 V input trigger commands IR Out ControlLink Control can Link Mute Output TriggerOutput of the Evolution Two is completely silenced RC-5 Control Recalls the factory settings RecallRS-232 Control Save Software CloneTape Input Begins the software clone processInitiates the software clone Theater Mode Volume Display +12 dB. The options are Enter the menu, thenQuestions and Answers Troubleshooting System Noise Appendix can Link and Multiple Evolution Two Preamplifiers Connection of multiple preamplifier channelsAppendix can Link and Multiple Evolution Two Preamplifiers Warranty Warranty Service@krellonline.com Return Authorization ProcedureTo contact the Krell Service Department AM to 500 PM ESTSpecifications Control outputs