Krell Industries KAV-280p User manual

Instructions for Use

Owner’s Reference

THE LEADER IN AUDIO ENGINEERING

KAV–280p

Remote Control

Preamplifier

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).

Do not place the preamplifier where it could be exposed to dripping or splashing.

The ventilation grids on the top and bottom of the KAV–280p must be unob-

structed at all times during operation. Do not place flammable material on top of

or beneath the component.

Do not remove or bypass the ground pin on the end of the AC cord. This may

cause RFI (radio frequency interference) to be induced into your playback sys-

tem.

When making connections to this or any other component, make sure all compo-

nents are off. Turn off all systems’ power before connecting the KAV–280p to any

other component. Make sure all cable terminations are of the highest quality, free

from frayed ends, short circuits, or cold solder joints.

When the line fuse needs to be replaced, use the spare fuse provided. Unplug

the component before replacing the fuse.

THERE ARE NO USER-SERVICEABLE PARTS INSIDE ANY KRELL PRODUCT.

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

tions not addressed in this reference manual.

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™ and Theater Throughput™ are trademarks of Krell Industries, Inc. All other trade-

marks and trade names are registered to their respective companies.

KAV–280p

Remote Control Preamplifier

Instructions for Use

v 02.0

CONTACT

INFORMATION

WARNINGS

Krell KAV–280p iii

Contents

Page

INTRODUCTION 1

DEFINITION OF TERMS 2

UNPACKING 3

PLACEMENT 4

AC Power Guidelines 4

FRONT PANEL DESCRIPTION 6

BACK PANEL DESCRIPTION 9

REMOTE CONTROL DESCRIPTION 12

Battery Installation and Removal 12

Remote Control Functions 12

CONNECTING THE KAV–280p TO YOUR SYSTEM 15

Connection Steps 15

OPERATING YOUR KAV–280p 16

Preamplifier Operation 16

Tape Input and Output 17

CONFIGURING THE KAV–280p

FOR THEATER THROUGHPUT 19

HOW TO TROUBLESHOOT SYSTEM NOISE 20

QUESTIONS AND ANSWERS 21

WARRANTY 22

RETURN AUTHORIZATION PROCEDURE 23

SPECIFICATIONS Back Cover

iv Krell KAV–280p

Illustrations

FIGURE 1 The KAV–280p Front Panel 5

FIGURE 2 The KAV–280p Back Panel 8

FIGURE 3 The KAV–280p Remote Control 11

Page

Krell KAV–280p 1

Introduction

Thank you for your purchase of the Krell KAV–280p Remote

Control Preamplifier. The KAV-280p uses current mode and sur-

face mount technologies derived directly from the state-of-the-art

Krell KCT Preamplifier.

The Class A direct-coupled design of the KAV–280p means that

the signal path is fully balanced from input to output. This includes

a fully balanced volume control. Circuits are powered by a dedicat-

ed supply with discrete voltage regulators and there is a separate,

dedicated power supply for all digital control circuits. All signal

switching is accomplished via hermetically sealed multiple contact

precision relays.

The KAV–280p provides a high level of operational convenience

and functional versatility. It is easy to integrate into your system.

The remote control accesses all amplifier functions, and remote

control connection options on the back panel allow the KAV–280p

to be easily connected with other components. With its unique

Theater Throughput TM feature, the KAV–280p can easily adapt to

home theater applications.

This owner’s reference manual contains important information on

the placement, installation, and operation of the KAV–280p.

Please read this information carefully. A thorough understanding of

these details will help ensure satisfactory operation and long life

for your KAV–280p and related system components.

Definition of Terms

OPERATION

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

erence manual.

Theater Throughput

Theater Throughput is a Krell configuration option that allows the

signal from a surround preamp/processor to pass through a Krell

preamplifier or integrated amplifier with no gain, for integrated vol-

ume and balance management of Krell home theater systems.

Balanced

Asymmetrical 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

Atwo-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.

Off

The component is off when the AC power cord is unplugged from

the wall receptacle.

Stand-by Mode

Alow power consumption status that keeps the audio circuits at

idle. When you plug the AC power cord into the wall receptacle,

the red stand-by LED illuminates. The component is now ready to

be switched to the operational mode. Krell recommends leaving

the component in the stand-by mode when it is not playing music.

Operational Mode

When the component is in the stand-by mode, and you press the

power button on the front panel or the power key on the remote

control, the blue power LED illuminates. The component is in the

operational mode and is ready to play music.

CONFIGURATIONS

INPUT AND OUTPUT

CONNECTIONS

2Krell KAV–280p

Definition of Terms, continued

Krell Current Mode

Aproprietary Krell circuit topology in which the audio gain stages

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

This unique technology provides the component with exceptional

speed and a wide bandwidth.

Surface Mount Technology (SMT)

SMT allows individual circuit elements to be placed very close

together. This shortens signal paths and allows circuit elements to

operate at the same temperature, resulting in more accurate signal

transfer and enhanced reliability.

TECHNOLOGY

Krell KAV–280p 3

Unpacking

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

following items are visible:

1KAV–280p Remote Control Preamplifier

1Accessory Kit containing:

1 AC power cord

1 12 VDC (12 V trigger) cable

1 KAV–280p remote control

1 CR2025 lithium battery for the remote

1 Packet containing the owner’s reference and the warranty

registration card.

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

the packing box.

3. Place the preamplifier in a safe location and remove the pro-

tective plastic wrapping.

If any of these items are not included please contact your authorized

Krell dealer.

Save all packing materials. If you must ship your KAV–280p in the future,

repack the unit in its original packaging to prevent shipping damage.

Notes

4Krell KAV–280p

Placement

Before you install the KAV–280p into your system, review the fol-

lowing guidelines to choose the location for the KAV–280p. This

will facilitate a clean, trouble-free installation. The KAV–280p does

not require any type of special rack or cabinet for installation. For

the dimensions of the KAV–280p, see Specifications, on the back

cover.

Place the KAV–280p on a firm, level surface, away from excessive

heat, humidity, or moisture. The KAV–280p is not hum-sensitive.

Other components may be placed on or around the KAV–280p.

Make sure the top and bottom ventilation grids are unobstructed.

You may experiment with feet or cones as long as they are not

permanently affixed to the chassis. Any unauthorized modifications

to the electronics or chassis will void the warranty.

The KAV–280p has superb regulation and does not require a dedi-

cated AC circuit. Avoid connections through extension cords or

multiple AC adapters. High quality 15 amp grounded AC strips are

acceptable. High quality AC line conditioners or filters may be

used if they are grounded. Contact your authorized Krell dealer,

distributor, or Krell before using any devices designed to alter or

stabilize the AC power for the KAV–280p.

The KAV–280p should be operated only with the power cord

supplied.

AC Power

Guidelines

Figure 1 The KAV–280p Front Panel

MUTETAPE

POWER

STAND-BY

KAV–280p

31245

B–1 S–1 S–2 S–3

711

Mode Indicators

8Mute Button

9Mute LED

Volume Adjustment

Functions

10 Level Knob

11 Front Panel Display

Power

1Power Button

2Power LED

3Stand-by LED

4Infrared Sensor

Analog Devices

5S-1, S-2, S-3, and

B-1 Buttons and LEDs

6Tape Button

7Tape LED

6Krell KAV–280p

The front panel of the KAV–280p accesses power on and off,

analog input selections, volume control, and mute. The front panel

display shows the volume and balance levels, and Theater

Throughput status.

1 Power Button

Use this button to switch the KAV–280p between the stand-by and

the operational modes.

2 Power LED

The blue power LED illuminates when the KAV–280p is in the

operational mode. The power LED also flashes when any remote

control key is pressed.

3 Stand-by LED

The red stand-by LED illuminates when the KAV–280p is plugged

into a standard AC wall receptacle, indicating that the amplifier is

in the stand-by mode and ready to be switched to the operational

mode.

4 Infrared Sensor

The infrared sensor receives commands from the KAV–280p

remote control. For proper remote control operation, make sure

the infrared sensor is clear of any obstructions.

5 S-1, S-2, S-3, and B-1 Buttons and LEDs

Use these buttons to select a balanced analog source component

(B-1) via an XLR connector or a single-ended analog source com-

ponent (S-1, S-2, or S-3) via single-ended RCA connectors. The

selected button’s LED illuminates.

6 Tape Button

Use this button to playback pre-recorded tapes. You may also use

this button to compare the output signal of an analog tape recorder

to an audio source. See Tape Input and Output, on page 18.

7 Tape LED

The red tape monitor LED illuminates when the tape monitor is

activated. The LED does not illuminate when an audio source is

activated.

Front Panel Description

See Figure 1 on page 5

POWER

ANALOG

SOURCE

COMPONENTS

Front Panel

Functions

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