Evolution Technologies 222 manual Troubleshooting System Noise

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SECTION EIGHT

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 222 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 off, remove the interconnect cables, then turn the pream- plifier on. If the hum disappears, turn the preamplifier off and reinsert one of the interconnect cables. Turn the preamplifier 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 Important Safety Instructions Contents List of Illustrations Letter from Dan D’Agostino Features Evolution 222 Features and TechnologyCast Basics Voltage Signal Transmission Traditional Audio SystemHow Cast and Krell Current Mode Interact Revolutionary Krell Cast TechnologyEvolution Cast Cast Cable ConstructionBest Musical Performance Inputs and Outputs Definition of TermsOperation Technology Krell Current ModePage AC Power Guidelines PlacementQuick Start Connecting the Evolution 222 to Your SystemOperating the Evolution Selectors Anatomy of the EvolutionRemote Functions on the Front Panel PowerFront Panel Description ChassisNavigate/Customize DisplayPreamplifier Functions Level Control Knob or Level Keys Level ControlEvolution 222 Remote Control Balance Functions Remote Control DescriptionBattery Installation and Removal Amplifier FunctionsCompact Disc and DVD Functions Evolution 222 Back Panel Outputs ConfigurationsBack Panel Description Inputs24 12 VDC In/Out 12 V Trigger Remote Connections on the Back Panel22 RS-232 23 RC-5Phono Power Port Phono Stage ConnectorIEC Power Cord Receptacle XLR Pin Configuration Connecting the Evolution 222 to Your SystemInput and Output Connections Connection Steps On/Off and Stand-by Operation Evolution 222 OperationTo Turn Off The System Customizing the Evolution Volume Knob or Level KeysNavigation Conventions AC Mains Menu FunctionsBalance input trim Balance channelMenu Button or Key Enter or exit the menu DisplayInfo Input Name Input Level TrimInput Trigger Input PhaseIR Out Control Evolution 222 responds to 12 V input trigger commandsMute Link Control can LinkOutput Trigger Recall RC-5 ControlSave RS-232 ControlTheater Mode Volume Display Troubleshooting System Noise Warranty Page To contact the Krell Service Department Return Authorization ProcedureInputs SpecificationsConnair Road