Krell Industries KSA 150 / 250 user manual

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KRELL,

THE LEADER IN AUDIO ENGINNERING



KSA – 150 / 250 OWNER’S MANUAL


INTRODUCTION

Thank you for your purchase of the new Krell KSA-150 or KSA-250 Power
amplifier. The KSA-150 and 250 represent the absolute latest evolution in
amplifier technology. They have many innovative design features in addition to
Krell refined Class A power and direct-coupled circuitry from input to output.

There are several aspects of the KSA-150 and KSA-250’s operation that require
your specia

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A. GENERAL INFORMATION The latest generation of high-resolution source components and speakers places new demands on the power amplifier. The Krell KSA 150 and KSA-250 meet these challenges with fresh design sophistication and long-term value. Both products can drive any speaker with an effortless quality that makes their power seem endless. Extreme clarity is maintained at all power levels. They both utilize Krell refined high-bias Class A and direct-coupled circuitry from input to outp

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protective action exists for a wide range of problematic conditions. Collectively, the protection circuitry is designed to avoid damage caused by other defective components, faulty wiring, mishandling of the system or amplifier failure. Krell is committed to balanced operation in all products. Balanced systems have long been standard in professional audio applications and the same advantages apply to home audio equipment. There is a 6dB increase in gain without an increase in noise and t

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D. INSTALLATION 1. CAUTIONS: These are important points of which you should always be aware. • Do not connect the power cord into the AC mains before completing the entire installation. • The unit must always be turned off while making connections. • Krell XLR and custom RCA connectors are made to very exacting standards. Connectors of lesser quality may damage the amplifiers or cause poor connections. Please check with your dealer or Krell about the use of any other connect

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The input that is not connected to the preamplifier may be used as an output to a second amplifier for power bi-amp applications. Before proceeding with such an installation, you should consult your dealer or Krell. The KSA-150 and KSA-250 are shipped with shorting pins in the XLR inputs. These pins must remain in the XLR inputs if the units are to operate in the single- ended mode. These pins must be removed to connect either unit for balanced operation. The shorting pin connects pins 1

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closing. At this pint the amplifier’s outputs are not connected to the speakers. After the protection circuits detect that the unit has completely stabilized, the speaker relays will engage. Another click will be heard at this point. The amplifier is now ready to use. The amplifier will be at temperature and sound its best after approximately 15 minutes. Operation of the amplifier is simple. It is important to note that care must be taken in the operation of the whole system in relation

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IMPORTANT NOTES REGARDING PROTECTION CIRCUITRY 1. When the Output Protection circuitry has been engaged, allow at least 20 seconds before turning on the amplifier again. Repeated fast cycling of the On/Off switch can damage the amplifier and void the warranty. 2. If the amplifier does not come on following the procedure above, please contact your dealer. 3. There is a circuit breaker on the amplifier real panel. This breaker protects the amplifier in the event of catastrophic failure.