Krell S 275 Owners Reference

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Krell S-2751 Introduction Thank you for your purchase of the Krell S-275 Stereo Power Amplifier. This configurable power amplifier has a discrete signal path from input to output and employs a wide bandwidth design with low negative feedback for sonic accuracy throughout the fre- quency spectrum. All circuits up to the driver stage are balanced and pure Class A. Krells new surface mount technology (SMT) means that the S-275 is a power amplifier with big power 275 Watts per channel that does not require big space. SMT allows individual circuit elements to be placed very closely together. This shortens signal paths and allows circuit elements to operate at the same temperature, result- ing in more accurate signal transfer and enhanced reliablilty. The S-275 is a slim line design allowing two amplifiers to fit into a space normally occupied by one. For systems requiring higher power, the S-275 can be configured for monaural operation by set- ting a switch on the rear panel. Power output increases to 550 Watts into 8 Ohms. A 6 dB gain switch provides a channel balanc- ing tool for systems using a combination of balanced and RCA style connections.This owners reference contains important infor- mation on the placement, installation, and operation of the S-275. Please read this information carefully. A thorough understanding of these details will help ensure satisfactory operation and long life for your S-275 and related system components.

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Definition of Terms Following are the definitions of key terms used in your owners ref- erence manual. Monaural Operation Monaural operation combines the output of the left and right chan- nels to create a more powerful single channel. In the case of the S-275, the output increases to 550 Watts. Balanced A symmetrical input or output circuit that has equal impedance from both input terminals to a common ground reference point. The industry standard for professional and sound recording instal- lations, balanced connections have 6 dB more gain than single- ended connections and allow the use of long interconnect cables. Balanced connections are completely immune to induced noise from the system or the environment. Single-ended A two-wire input or output circuit. Use care when using single- ended connections as the ground connection is made last and broken first. Turn the system off prior to making or breaking single- ended connections. Single-ended connections are not recom- mended for connections requiring long cable runs. CONFIGURATIONS INPUT AND OUTPUT CONNECTIONS 2Krell S-275