Krell Industries KAV 3250 Guida rapida

Instructions for Use

Owner’s Reference

THE LEADER IN AUDIO ENGINEERING

KAV–2250

Stereo Power Amplifier

KAV–3250

T ree-c annel Power Amplifier

KAV–2250

Stereo Power Amplifier

KAV–3250

T ree-c annel Power Amplifier

Instructions for Use

v 01.2

Krell Industries, Inc.

45 Connair Road

Orange, CT 06477-3650 USA

TEL 203-799-9954

FAX 203-891-2028

E-MAIL [email protected]

WEBSITE ttp://www.krellonline.com

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. ulti Amp Throughput™ and Krell Current ode™ are trademarks of Krell Industries, Inc. All other

trademarks and tradenames are registered to their respective companies.

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

WARNINGS

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 and bottom of the amplifier must be unobstructed 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 stabi-

lize the C power for the K V–2250 and the K V–3250.

Before connecting the K V–2250 and the K V–3250, 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.

Make sure that only one switch on an input switch bank is in the up (on) position at one time.

THERE ARE NO USER SERVICEABLE PARTS INSIDE ANY KRELL PRODUCT.

Please contact your authorized Krell dealer, distributor, or Krell if you have any questions not addressed in

this reference manual.

Krell KAV–2250 and KAV–3250 iii

Contents Page

INTRODUCTION 1

DEFINITION OF TER S 2

UNPACKING 4

PLACE ENT 5

AC Power Guidelines 5

FRONT PANEL DESCRIPTION 7

BACK PANEL DESCRIPTION 9

CONNECTING THE A PLIFIER TO YOUR SYSTE 11

Input and Output Connections 11

A PLIFIER OPERATION 13

On/Off and Operation 13

Using a Dedicated Wall Switch 13

TROUBLESHOOTING SYSTE NOISE 14

RECONFIGURATION OPTIONS FOR THE KAV–2250 AND KAV–3250 15

To Safely Access the Input Switch Banks 15

Amplifier Factory Default Settings 18

Reconfiguring the Amplifier for AT Operation 18

Reconfiguring the Amplifier for Bridged Operation 21

Example of a Connection Scenario: ulti-power ode 22

QUESTIONS AND ANSWERS 23

WARRANTY 24

RETURN AUTHORIZATION PROCEDURE 25

SPECIFICATIONS

KAV–2250 26

KAV–3250 27

Krell KAV–2250 and KAV–3250

Illustrations Page

FIGURE 1 The KAV–2250 Front Panel 6

FIGURE 2 The KAV–3250 Front Panel 6

FIGURE 3 The KAV–2250 Back Panel 8

FIGURE 4 The KAV–3250 Back Panel 8

FIGURE 5 Amplifier Factory Default Settings 16

FIGURE 6 Reconfiguring the KAV–2250 for AT Operation 17

FIGURE 7 Reconfiguring the KAV–3250 for AT Operation 17

FIGURE 8 Reconfiguring the KAV–2250 for Bridged Operation 20

FIGURE 9 Reconfiguring the KAV–3250 for Bridged Operation 20

Krell KAV–2250 and KAV–3250 1

Introduction

Thank you for your purchase of the Krell KAV–2250 Stereo Power Amplifier or the KAV–

3250 Three-channel Power Amplifier.

The KAV–2250 and KAV–3250 amplifiers provide substantial two- and three-channel

output power that delivers realistic music reproduction at an exceptional value. These

amplifiers can be customized with two optional system configurations: ulti Amp

Throughput ( AT) and bridged operation. These configurations provide a wider range of

power outputs and connection options. Both the KAV–2250 and KAV–3250 amplifiers

have balanced and single-ended inputs, for complete compatibility with other

components. The KAV–2250 and KAV–3250 amplifiers can be operated using the 12

VDC trigger on other components. Either amplifier integrates seamlessly into home

theater or whole-house systems.

This reference manual contains important information on placement, installation, and

operation of the KAV–2250 and KAV–3250 amplifiers. Please read this information

carefully. A thorough understanding of these details helps ensure satisfactory operation

and long life for your amplifier and related system components.

Krell KAV–2250 and KAV–3250

Definition of Terms

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

CONFIGURATIONS

Bridging

A method of linking two amplifier channels by distributing the speaker load between the

positive binding posts. Bridging the channels quadruples the power rating at 8 Ohms.

Bridged configurations should not be used with loads under 4 Ohms.

Krell Multi Amp T roug put (MAT)

An internal configuration option that sends the same music signal to all amplifier

channels using one balanced or single-ended connection. AT reduces installation

complexity and cabling requirements in systems containing multiple amplifiers. AT

also allows a variety of connection scenarios, including powering loudspeakers that

have two sets of binding posts and independently powering multiple pairs of stereo

loudspeakers to extend the listening environment throughout your home.

INPUT AND OUTPUT CONNECTIONS

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

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

A two-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 recommended for

connections requiring long cable runs.

Krell KAV–2250 and KAV–3250 3

Definition of Terms,

continued

OPERATION

Off

When the back panel power switch is in the down (off) position and the red stand-by

LED turns off, the component is off.

Stand-by Mode

When the AC power cord is plugged into the wall and the back panel power switch is in

the up (on) position, the red stand-by LED illuminates, indicating that the component is

in stand-by mode. This low power consumption status keeps the audio and regulator

circuits 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 indicator illuminates, the component is in the operational mode and ready to

play music.

TECHNOLOGY

Krell Current Mode

A proprietary 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.

Krell KAV–2250 and KAV–3250

Unpacking

1. Open the shipping box and remove the top layer of foam. You see these items:

1 amplifier unit (packed in foam end-caps)

1 IEC connector (AC power) cord

1 12 VDC output (12 V trigger) cable

1 T-15 Torx wrench

KAV–2250 fuses:

2 AGC-12 (12-amp)

KAV–3250 fuses:

3 AGC-12 (12-amp)

1 packet containing the owner’s reference manual

and the warranty registration card.

2. Locate the cutouts in the foam end caps.

3. Slip hands under cutouts and lift the amplifier straight out of the box.

4. Place the amplifier in a safe location and remove the protective plastic wrapping.

Notes

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 Aut orization Procedure,

on page 25, for more information.

The KAV–2250 weighs 64 lbs. and the KAV–3250 weighs 68 lbs. It may be more

convenient for two people to lift the amplifier out of the shipping box.

Krell KAV–2250 and KAV–3250 5

Placement

Before you integrate your new amplifier into your system, please review the following

guidelines to choose the location for the component. This will facilitate a clean, trouble-

free installation.

The 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 amplifier does not require any type of special rack or cabinet for installation. For the

dimensions of your amplifier see

Specifications

, on pages 26 and 27.

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, regardless of the cable’s gauge. Krell amplifiers drive the lowest

impedances with ease, but long loudspeaker cables reduce the maximum power that is

delivered to the loudspeakers.

AC POWER GUIDELINES

Krell recommends operating the amplifier from a dedicated 15-amp AC power line.

Please contact your authorized Krell dealer, distributor, or Krell before using any

devices designed to alter or stabilize the AC power for the KAV–2250 and KAV–3250.

Power Cord

The KAV–2250 and KAV–3250 should be operated only with the power cord supplied.

KAV–2250

132

6Krell KAV–2250 and KAV–3250

Figure 1 The KAV–2250 Front Panel

Figure 2 The KAV–3250 Front Panel

KAV–3250

132

1 Power Button

2 Stand-by LED

3 Power Indicator

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