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Connect the loudspeaker cables to the Showcase Amplifier channel output binding posts (6) located on the back panel. The Showcase 5 uses only outputs 1-5 and has caps on the speaker binding posts for channels 6 and 7. The Showcase 6 uses outputs 1-6 and has caps on the speaker binding posts for channels 6 and 7. The binding post terminals accept spade lugs, bare wire, or pins. Use the red terminal for the positive connection and the black terminal for the negative connection. Tighten loudspeaker binding posts by hand only. 5. Plug the end of the AC power cord into the AC wall outlet. The amplifier is now ready for operation. See Amplifier Operation, on page 12. The Showcase 5 and Showcase 6 amplifiers may be upgraded with additional channels, up to seven. Please contact your Krell-authorized dealer or distributor for information on upgrading your amplifier to six or seven channels. Krell Showcase Amplifier Amplifier Operation ON/OFF AND OPERATION IMPORTANT IMPORTANT When powering up your system, turn the amplifiers on last. When powering down your system, turn amplifiers off first. The procedures for amplifier operation follow. 1. Plug the end of the AC power cord into the AC wall outlet. 2. The red stand-by LED (2) illuminates. When the amplifier is first plugged in, there is a brief delay before it can be put in the operational mode. Please wait approximately 10 seconds. If the red LED flashes when the amplifier is in the stand-by mode, unplug the amplifier from the AC wall outlet to reset the protection circuit. Check the loudspeakers and loudspeaker cables for potential short circuits before plugging the amplifier back into the wall outlet. 3. Press the power button (1) on the front panel. The blue power LED (3) illuminates and you hear a click. The amplifier is in the operational mode. Krell recommends leaving the Showcase Amplifier in the stand-by mode unless you will not be playing music for a long time. Always turn the amplifier off before changing input connections, and mute or fully attenuate the preamplifier level when switching sources. The Showcase Amplifier has tremendous reserves of power and safely drives loudspeakers to extremely high sound pressure levels. However, use care when setting high playback levels and lower the volume level at any sign of loudspeaker distress. Krell Showcase Amplifier 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 all loudspeakers. If this happens when you place the Showcase Amplifier into your system, follow these simple troubleshooting steps: 1. Check that all input and output connections are of sound construction. 2. With the amplifier off, remove all the interconnect cables, then turn the amplifier on. If the hum disappears, turn the amplifier off and reinsert one of the interconnect cables. Turn the amplifier back on. 3. If the hum reappears with the interconnect cable reinserted, the cable may need to be replaced. Turn the amplifier off and connect a different interconnect cable to the same location. Turn the amplifier back on. 4. If the hum disappears with the interconnect cable reinserted, that cable most likely is sound. 5. Turn the amplifier off, disconnect the interconnect cable, and reconnect one of the other interconnect cables. 6. Repeat steps 3 through 5 until you have checked each interconnect cable. 7. If all the interconnect cables appear to be sound, and you still have hum, you may be experiencing a ground loop. Please contact your authorized Krell dealer, distributor, or Krell for suggestions on how to eliminate the hum. Krell Showcase Amplifier Questions and Answers Q. Should I turn the Showcase Amplifier off (unplug the amplifier) when not playing music? A. No. Leave the Showcase Amplifier in the stand-by mode when not playing music. The stand-by mode avoids cold starts as well as minimizes heat output and power consumption. Turn the amplifier off if you plan to be away for a period of time, for example, on vacation. See Amplifier Operation, on page 12. Q. When I turn the amplifier on there is a loud hum through the loudspeakers. What should I do? A. When a new component is introduced, a low frequency hum may occur in one or both loudspeakers. Check that all input and output connections and cables are of sound construction. See Troubleshooting System Noise, on page 13. If the connections and cables are sound, you may be experiencing a ground loop. This can often be easily eliminated. Please contact your authorized Krell dealer, distributor, or Krell for suggestions. Q. When I connect the amplifier to my system using the single- ended inputs, a loud buzz com...

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