Krell Industries DVD Standard User manual

Instructions for Use

Owner’s Reference

THE LEADER IN AUDIO ENGINEERING

Theater Amplifier

Standard

Multichannel Amplifier

Theater Amplifier

Standard

Multichannel Amplifier

Instructions for Use

v 02.0

rell 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 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. Multi Amp Throughput™ and Krell Current Mode™ are trademarks of Krell Industries, Inc. All other

trademarks and tradenames are registered to their respective companies.

This product complies with the EMC 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, bottom, and sides 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 Theater mplifier Standard.

Before connecting the Theater mplifier Standard, 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 set of inputs to the amplifier at a time.

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

Do not connect the multichannel (DB-25) input and the single-ended or balanced inputs at the same 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 Theater Amplifier Standard iii

Contents Page

INTRODUCTION 1

DEFINITION OF TERMS 2

UNPACKING 4

PLACEMENT 5

AC Power Guidelines 5

FRONT PANEL DESCRIPTION: THEATER AMPLIFIER STANDARD 7

BACK PANEL DESCRIPTION: THEATER AMPLIFIER STANDARD 9

CONNECTING THE THEATER AMPLIFIER STANDARD TO YOUR SYSTEM 11

Input and Output Connections 11

AMPLIFIER OPERATION 13

On/Off and Operation 13

Using a Dedicated Wall Switch 13

TROUBLESHOOTING SYSTEM NOISE 14

RECONFIGURATION OPTIONS FOR THE THEATER AMPLIFIER STANDARD 15

To Safely Access the Input Switch Banks 15

Amplifier Factory Default Settings 18

Reconfiguring the Theater Amplifier Standard for MAT Operation 18

Reconfiguring the Theater Amplifier Standard for Bridged Operation 22

Reconfiguring the Theater Amplifier Standard

for Combined MAT and Bridged Operation 24

Example of a Connection Scenario: Multi-power Mode 25

QUESTIONS AND ANSWERS 27

WARRANTY 28

RETURN AUTHORIZATION PROCEDURE 29

SPECIFICATIONS 30

iv Krell Theater Amplifier Standard

Illustrations Page

FIGURE 1 The Theater Amplifier Standard Front Panel 6

FIGURE 2 The Theater Amplifier Standard Back Panel 8

FIGURE 3 The Theater Amplifier Standard Input Circuit Board

Factory Default Settings 16

FIGURE 4 Reconfiguring the Theater Amplifier Standard for MAT Operation 17

FIGURE 5 Reconfiguring the Theater Amplifier Standard for Bridged Operation 21

FIGURE 6 Reconfiguring the Theater Amplifier Standard for Combined MAT

and Bridged Operation 23

Krell Theater Amplifier Standard 1

Introduction

Thank you for your purchase of the Krell Theater Amplifier Standard Multichannel

Amplifier.

The Theater Amplifier Standard provides substantial five-channel output power that

delivers realistic music reproduction at an exceptional value. The amplifier channels

can be customized quickly through a series of switches. Optional system configurations

include bridged operation and a multi-power mode using the Multi Amp Throughput

(MAT) feature. The Theater Amplifier Standard has balanced and single-ended inputs

for compatibility with other components. The multichannel (DB-25) input also allows you

to integrate the amplifier easily and seamlessly into home theater systems. The

amplifier can be operated using the 12 VDC power on/off (12 V trigger) signals from

other components. The Theater Amplifier Standard is versatile, fitting a variety of

installations including rack-mounted and inside cabinetry.

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

operation of the Theater Amplifier Standard. Please read this information carefully. A

thorough understanding of these details helps ensure satisfactory operation and long

life for your Theater Amplifier Standard and related system components.

2Krell Theater Amplifier Standard

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 Throughput (MAT)

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

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

complexity and cabling requirements in systems containing multiple amplifiers. MAT

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 less susceptible than single-ended connections to induced noise from

the system or the environment.

Multichannel (DB-25)

A balanced input or output circuit that allows for the simultaneous connection of all

audio outputs plus one 5 VDC (5 Volt trigger) via a single cable. DB-25 inputs and

outputs are becoming popular for connecting an audio/video surround sound processor

and power amplifiers, simplifying the integration of the two components into your

system.

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 Theater Amplifier Standard 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 the 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 the voltage domain. This unique technology provides

the component with exceptional speed and a wide bandwidth.

4Krell Theater Amplifier Standard

Unpacking

Open the shipping box, which contains:

1 amplifier unit (packed in foam end-caps)

1 AC power cord

5 AGC-12 (12-amp) speaker fuses

1 12 VDC output (12 V trigger) cable

1 T-15 Torx wrench

1 packet containing the owner’s reference manual

and the warranty registration card.

IMPORTANT

Two people are needed to remove the amplifier from the shipping box.

1. One person grasps the underside of the foam end-caps at one end of the amplifier;

at the same time, the second person grasps the underside of the foam end-caps at

the other end of the amplifier.

2. Slowly lift the amplifier straight out of the shipping box.

3. 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 Authorization Procedure,

on page 29, for more information.

Krell Theater Amplifier Standard 5

Placement

Before you integrate the Theater Amplifier Standard into your system, review the

following guidelines to choose the location for the component. This will facilitate a

clean, trouble-free installation.

The Theater Amplifier Standard 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 Theater Amplifier Standard does not require any type of special rack or cabinet for

installation. For the dimensions of your amplifier see

Specifications

,on page 30.

Place the amplifier as close to the loudspeakers as possible and keep the speaker

cable length to a minimum. Speaker 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 speaker cables reduce the maximum power that is

delivered to the loudspeakers.

AC POWER GUIDELINES

Krell recommends operating the Theater Amplifier Standard from a dedicated 20-amp

AC power line. The Theater Amplifier Standard should be used only with the AC power

cord supplied. Please contact your Krell dealer, distributor, or Krell before using any

devices designed to alter or stabilize the AC power for the Theater Amplifier Standard.

1 Power Button

2 Stand-by LED

3 Power Indicator

13 2

Theater Amplifier Standard

Figure 1 The Theater Amplifier Standard Front Panel

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