Krell Industries S1500 User Manual

INSTRUCTIONS FOR USE

S–1500

MULTI-CHANNEL
AMPLIFIER

Owner’s Reference

S–1500

Multi-channel Amplifier

Instructions for Use

v 07.0

CONTACT
INFORMATION

This product complies with the
EMC directive (89/336/EEC)
and the low-voltage directive
(73/23/EEC).

Krell Industries, Inc.
45 Connair Road
Orange, CT 06477-3650 USA
TEL [phone]
FAX [phone]
E-MAIL [e-mail]
WEBSITE http://www.krellonline.com

IMPORTANT SAFETY INSTRUCTIONS

1. Read Instructions.

2. Keep these Instructions.

3. Heed all Warnings.

4. Follow all Instructions.

5. Do not use this apparatus near water.

6. Clean only with a dry cloth.

7. Do not install near any heat sources such as radiators, heat registers,

stoves, or other apparatus (including amplifiers) that produce heat.

8. Unplug this apparatus during lightning storms or when unused for long
periods of time.

9. Refer all servicing to qualified service personnel. Servicing is required
when the apparatus has been damaged in any way, such as a power­supply cord or plug is damaged, liquid has been spilled or objects have
fallen into the apparatus, the apparatus has been exposed to rain or
moisture, does not operate normally, or has been dropped.

10. The

11. The ventilation grids on the top and bottom of the S–1500 amplifier must

12. Before making connections to the S –1500 amplifier, ensure that the power

13. THERE ARE NO USER SER

S–1500 amplifier must be placed on a firm, level surface where it is

not exposed to dripping or splashing.

be unobstructed at all times during operation. Do not place flammable

–1500 amplifier.

material above or beneath the

is off and other components are in mute or stand-by mode. Make sure all
cable terminations are of the highest quality, free from frayed ends, short
circuits, or cold solder joints.

AMPLIFIER.

S

VICEABLE PARTS INSIDE AN S –1500

© 2007 by Kr

Please contact Krell if you have questions not addressed in this guide.

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.

ell Industries, Inc. All rights reserved P/N 309582-F

Contents

Page

INTRODUCTION 5

DEFINITION OF TERMS 6

UNPACKING 7

PLACEMENT 8

AC Power Guidelines

FRONT PANEL DESCRIPTION 10

BACK PANEL DESCRIPTION 11

CONNECTING THE S–1500 AMPLIFIER TO YOUR SYSTEM 13

Input and Output Connections

OPERA

TING THE S–1500 AMPLIFIER 15

On/Off and Operation

TROUBLESHOOTING SYSTEM NOISE 16

QUESTIONS AND ANSWERS 17

WARRANTY 18

RETURN AUTHORIZATION PROCEDURE 20

SPECIFICA

TIONS

21

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Illustrations

Page

FIGURE 1 The S–1500 Multi-channel Amplifier

Front Panel 9

FIGURE 2 The S–1500 Multi-channel Amplifier

Back Panel 9

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Introduction

Thank you for your purchase of a Krell S–1500 Multi-channel
Amplifier.

The S–1500 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.
The S–1500 / 5 includes five amplifier channels, the S –1500 / 6
includes six amplifier channels, and the S–1500 / 7 includes seven
amplifier channels. The S–1500 / 5 and S –1500 / 6 may be
upgraded with additional channels, up to seven.

Please contact your authorized Krell dealer or distributor for infor­mation on upgrading your amplifier to six or seven channels.

S –1500 amplifier has balanced and single-ended inputs for

The
compatibility with other components. The amplifiers can be oper

­ated using the 12 VDC power on/off (12 V trigger) signals from
other components. The S–1500 amplifier is versatile, fitting a vari

-

ety of installations including rack-mounted and inside cabinetry.

This reference manual contains important information on place­ment, installation, and operation of the S–1500 amplifier. Please
read this information carefully. A thorough understanding of these
details helps ensure satisfactory operation and long life for your
S–1500 amplifier and related system components.

Please contact your authorized Krell dealer, distributor, or Krell, if
you have any questions about the S–1500 not addressed in this
owner’s reference.

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Definition of Terms

Following are the definitions of key terms used in this owner’s ref­erence.

INPUT AND OUTPUT
CONNECTIONS

OPERATION

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 single­ended connections, 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 single­ended connections as the ground connection is made last and
broken first. Turn the system off prior to making or breaking single­ended connections. Single-ended connections ar
mended for connections requiring long cable runs.

f

Of

When the AC power cord is not plugged into the wall, the front
panel LED is not illuminated and the component is off.

Stand-by Mode

When the AC power cord is plugged into the wall, the front panel
stand-by and power LED (2) illuminates r
component is in the stand-by mode. This low power consumption
status keeps the audio and cir
ing the component in the stand-by mode when it is not playing
music.

cuits at idle. Kr

ed, indicating that the

e not recom-

ecommends leav

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Operational Mode

From the stand-by mode, when the power button on the front
panel is pressed and the front panel stand-by and power LED (2)
illuminates blue, the component is in the operational mode and

eady to play music.

r

TECHNOLOGY

6 Krell S–1500 Multi-channel Amplifier

Krell Current Mode

A proprietary Krell circuit topology in which the audio gain stages
of a component operate in the current domain, rather than the
voltage domain. This unique technology provides the component
with exceptional speed and a wide bandwidth.

Unpacking

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

following items are visible:

1 S–1500 Multi-channel Amplifier

1 Accessory Kit containing:

1 AC power cord
1 12 VDC output (12 V trigger) cable
1 12A 1/4-inch slow-blow fuse for 100 –120 VAC
1 6A 1/4-inch slow-blow fuse for 220 –240 VAC

1 Packet containing the owner’s reference manual and the

warranty registration card.

IMPORTANT

NotesNotes

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 20, for more information.

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