Krell Industries Showcase 5 User manual

Instructions for Use

Owner’s Reference

THE LEADER IN AUDIO ENGINEERING

Showcase 7

Showcase 6

Showcase 5

Multichannel Amplifier

This product is manufactured in the United States of America. Krell®is a registered trademark of Krell

Industries, Inc., and is restricted for use by Krell Industries, Inc., its subsidiaries, and authorized agents. Krell

Current Mode™ is a trademark of Krell Industries, Inc. All other trademarks and tradenames are registered

to their respective companies.

Showcase 7

Showcase 6

Showcase 5

Multichannel Amplifier

Instructions for Use

v 02.1

Krell Industries, Inc.

45 Connair Road

Orange, CT 06477-3650 USA

TEL 203-799-9954

FAX 203-891-2028

E-MAIL [email protected]

WEBSITE http://www.krellonline.com

This product complies with the EMC directive (89/336/EEC) and the low-voltage

directive (73/23/EEC).

The amplifier must be placed on a firm, level surface where it is not exposed to

dripping or splashing.

The ventilation grids on the top, bottom, and sides of the amplifier must be unob-

structed at all times during operation. Do not place flammable material above or

beneath the amplifier.

Contact your authorized Krell dealer, distributor, or Krell before using any devices

designed to alter or stabilize the AC power for the Showcase Amplifier.

Before connecting the Showcase Amplifier, make sure the amplifier is turned off

and any output device (such as a preamplifier) is in mute or stand-by mode. Make

sure all cable terminations are of the highest quality and free from frayed ends,

short circuits, or cold solder joints.

Use only one input to each amplifier channel at a time.

If the red LED flashes when the amplifier is in the stand-by mode, unplug the

amplifier to reset the protection circuit. Check the loudspeakers and loudspeaker

cables for potential short circuits before reconnecting the amplifier to your system.

THERE ARE NO USER SERVICEABLE PARTS INSIDE THE PREAMPLIFIER

Please contact your authorized Krell dealer, distributor, or Krell if you have any ques-

tions not addressed in this reference manual.

CONTACT

INFORMATION

WARNINGS

Contents

Krell Showcase Amplifier iii

INTRODUCTION 1

DEFINITION OF TERMS 2

UNPACKING 3

PLACEMENT 4

AC Power Guidelines 4

FRONT PANEL DESCRIPTION 6

BACK PANEL DESCRIPTION 8

CONNECTING THE SHOWCASE AMPLIFIER

TO YOUR SYSTEM 10

Input and Output Connections 10

AMPLIFIER OPERATION 12

On/Off and Operation 12

TROUBLESHOOTING SYSTEM NOISE 13

QUESTIONS AND ANSWERS 14

WARRANTY 15

RETURN AUTHORIZATION PROCEDURE 16

SPECIFICATIONS 17

Page

iv Krell Showcase Amplifier

FIGURE 1 The Showcase Amplifier Front Panel 5

FIGURE 2 The Showcase Amplifier Back Panel 7

Illustrations

Page

Krell Showcase Amplifier 1

Thank you for your purchase of a Krell Showcase Amplifier.

The Showcase Amplifier is a flexible design that delivers five, six,

or seven channels of amplification. All three configurations include

input and output connections for all seven channels. The amplifiers

differ only by how many channels are housed within the amplifier.

A Showcase 5 includes five amplifier channels, a Showcase 6

includes six amplifier channels, and a Showcase 7 includes seven

amplifier channels. The Showcase 5 and Showcase 6 may be

upgraded with additional channels, up to seven. The Showcase

Amplifier has balanced and single-ended inputs for compatibility

with other components. The amplifiers can be operated using the

12 VDC power on/off (12 V trigger) signals from other components.

The Showcase Amplifier is versatile, fitting a variety of installations

including rack-mounted and inside cabinetry.

Please contact your Krell-authorized dealer or distributor for infor-

mation on upgrading your amplifier to six or seven channels.

This reference manual contains important information on place-

ment, installation, and operation of the Showcase Amplifier. Please

read this information carefully. A thorough understanding of these

details helps ensure satisfactory operation and long life for your

Showcase Amplifier and related system components.

Introduction

2Krell Showcase Amplifier

Following are the definitions of key terms used in your owner’s ref-

erence manual.

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 installations,

balanced connections have 6 dB more gain than single-ended con-

nections and allow the use of long interconnect cables. Balanced

connections are less susceptible than single-ended connections 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 bro-

ken first. Turn the system off prior to making or breaking single-

ended connections. Single-ended connections are not recommend-

ed for connections requiring long cable runs.

Off

When the AC power cord is not plugged into the wall, the red

stand-by LED is not illuminated and the component is off.

Stand-by Mode

When the AC power cord is plugged into the wall, the red stand-by

LED illuminates, indicating that the component is in the stand-by

mode. This low power consumption status keeps the audio and cir-

cuits at idle. Krell recommends leaving the component in the stand-

by mode when it is not playing music.

Operational Mode

From the stand-by mode, when the power button on the front panel

is pressed and the blue power LED illuminates, the component is in

the operational mode and ready to play music.

Krell Current Mode

A proprietary Krell circuit topology in which the audio gain stages of

a component operate in the current rather than the voltage domain.

This unique technology provides the component with exceptional

speed and a wide bandwidth.

Definition of Terms

INPUT AND OUTPUT

CONNECTIONS

OPERATION

TECHNOLOGY

Unpacking

Krell Showcase Amplifier 3

1. Open the shipping box, and remove the top layer of foam. The

following items are visible:

1 Showcase Amplifier

1 Accessory Kit containing:

1 AC power cord

1 12 VDC output (12 V trigger) cable

1 spare AC mains fuse

1 10 A slow-blow fuse for 100 –120 VAC

1 5 A slow-blow fuse for 220 –240 VAC

1 packet containing the owner’s reference manual and the

warranty registration card.

Two people are needed to remove the amplifier from the shipping

box.

2. Grasp the underside of the amplifier and lift it straight out of the

shipping box.

3. Place the amplifier in a safe location and remove the protective

plastic wrapping.

If any of these items are not included in the shipping box, please contact

your authorized Krell dealer, distributor, or Krell for assistance.

Save all packing materials. If you ship your amplifier in the future, repack

the unit in its original packaging to prevent transit damage. See Return

Authorization Procedure, on page 16, for more information.

IMPORTANT

Notes

4Krell Showcase Amplifier

Before you integrate the Showcase Amplifier into your system,

review the following guidelines to choose the location for the com-

ponent. This will facilitate a clean, trouble-free installation.

The Showcase Amplifier requires at least two inches (5 cm) of

clearance on each side and at least two inches (5 cm) of clearance

above and below the component to provide adequate ventilation.

The Showcase Amplifier does not require any type of special rack

or cabinet for installation. For the dimensions of your amplifier see

Specifications, on page 17.

Place the amplifier as close to the loudspeakers as possible and

keep the loudspeaker cable length to a minimum. Loudspeaker

cable adds impedance to the load the amplifier must drive, regard-

less of the cable’s gauge. Krell amplifiers drive the lowest imped-

ances with ease, but long loudspeaker cables reduce the maximum

power that is delivered to the loudspeakers.

Placement

Krell recommends operating the Showcase Amplifier from a dedi-

cated 15-amp AC power line. Please contact your Krell dealer, dis-

tributor, or Krell before using any devices designed to alter or stabi-

lize the AC power for the Showcase Amplifier.

AC POWER

GUIDELINES

1 Power Button

2 Stand-by LED

3 Power LED

SHOWCASE

AMPLIFIER

2 13

STAND-BY

POWER

Figure 1 The Showcase Amplifier Front Panel

The Showcase Amplifier front panel provides power on and indi-

cates operating status.

1 Power Button

Use this button to switch the Showcase Amplifier power between

the stand-by and the operational modes and also to switch the 12

VDC output (12 V trigger) on and off.

2 Stand-by LED

The red stand-by LED illuminates when the AC power cord is

plugged into the wall. The stand-by LED flashes when the protec-

tion circuit is activated.

3 Power LED

The blue power LED illuminates when the amplifier is in the opera-

tional mode.

6Krell Showcase Amplifier

Front Panel Description

See Figure 1 on page 5

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