Krell Industries KSA-100S Quick start guide

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KSA-100S / 200S/300S OWNER’S REFERENCE

INTRODUCTION

Thank you for your purchase of the KRELLKSA-100S/200S/300S power

amplifier. These amplifiers represent the latest evolution in amplifier

technology, matching unprecedented performance with convenience not

obtainable from most high performance audio designs.

Throughout this Reference wewill refer to all three of the amplifiers as KSA.

All three amplifiers operate identically, while their sonic characteristics,

specifications, and dimensions vary. Specific differences will be described

in detail.

To obtain the best performance from your KSA, careful attention should be

paid to placement, installation and operation. A thorough understanding of

these details will help insure satisfactory operation and long life for the KSA

and related system components.

This Owner’s Reference is divided into several sections, each designed to

perform a different function. As you read through it you will become better

acquainted with the features and functions that make the KSAseries

amplifiers a superb value. A Question and Answer section is also included

where answers to common questions are provided. Should you have any

questions or suggestions please feel free to contact your authorized dealer

or the KRELLstaff for assistance.

In the unlikely event that your KSAshould require service, you will be

pleased to know that it is backed by a comprehensive Customer Satisfaction

policy and one of the most advanced service facilities in the industry. For

detailed information on the terms and conditions of service, please refer to

the Warranty and Service section of this Reference, Warranty Registration

Card, and your authorized KRELLDealer or Distributor.

PAGE 2

TABLE OF CONTENTS

4 UNPACKING

5 LOCATION AND REMOTE TURN-ON

6 CABINETRY AND AC POWER CONSIDERATIONS

7 AMPLIFIER FEET AND REMOTE MASTER/SLAVE CONNECTIONS

9 INPUT AND OUTPUT CONNECTIONS

12 AMPLIFIER OPERATION

13 TURN-ONDESCRIPTION

14 SYSTEMNOISE

15 BIAS LEVEL METER

16 FRONTPANEL METERBUTTON

17 REMOTECONTROLFUNCTIONS

18 PROTECTION CIRCUITRY AND TROUBLESHOOTINGSTEPS

20 QUESTIONSANDANSWERS

22 SPECIFICATIONS

23 WARRANTYAND SERVICE INFORMATION

PAGE3

UNPACKING

NOTE:Due to the extreme weight of the KSAamplifiers, it is strongly advised

that unpacking and placement is completed by at least two individuals.

1. Open the box.

2. Fold back the flaps on all four sides of the box and carefully roll it over on

to the exposed end.

3. Pull the box straight up and off exposing the foam packing material.

4. Pull the foam piece from the exposed end of the amplifier.

5. Roll the amplifier carefully onto its handles and remove the second piece

of foam.

The following items will now be visible:

4or5

KSAstereo amplifier

Remote control

Warranty card

AC power cord

Rubber feet bottoms (KSA-300S has 5 feet)

NOTE:If any’ of these items are not included, please contact your authorized

dealer immediately for assistance.

6. Removethe plastic bag from the amplifier.

NOTE:Save all packing materials. If you must ship your KSAin the future,

repack the unit in its original packaging to prevent transit damage. Should

the unit require service, send the remote control and ACpower cord with the

amplifier.

CAUTION:Do not connect the power cord to the ACmains before completing

the Installation section.

PAGE 4

BASIC INSTALLATION

LOCATION

Place the KSAon a firm level surface away from excessive dirt or moisture.

When using custom racks or cabinetry, keep in mind the weight and

ventilation requirements for these amplifiers. Ideally the amplifier should be

placed as close to the speakers as possible. It is preferable to run long

balanced interconnect cables to the amplifier and keep speaker cable length

to a minimum. Speaker cable adds impedance to the load the amplifier must

drive, regardless of the cable’s gauge. All KRELLamplifiers will drive the

lowest impedances with ease, but when impedance is added due to long

cable lengths, amplifier power is literally wasted in driving the cable. Long

speaker cables reduce the maximum power that can be delivered to the

speakers.

REMOTE TURN-ON INSTALLATION

Someinstallations do not have adequate space or arrangement flexibility for

the amplifier to be placed near the speakers. To allow for this, the KSA

¯ amplifiers can be turned On or Offfrom a room other than the listening room.

This type of amplifier placement is referred to as Remote Installation. The

KSAcan be placed in a room or space close to the speakers, but out of sight,

and turned On and Off from the listening room. There is a provision

internally to allow the amplifier to be controlled from a wall ACreceptacle

and not from the front panel power switch or remote control. Wesuggest a

standard wall switch be mounted in the listening room to control an AC

power outlet dedicated to the power amplifier. This can be accomplished by

an electrician. Please contact your dealer for assistance.

NOTE:Whenset-up for remote turn-on, the front panel power switch will not

operate, nor will the power switch on the remote control. The meter switches

on the front panel and remote are not affected and will operate normally.

NOTE: Remember to keep speaker cable lengths to a minimum.

PAGE5

BASIC INSTALLATION

CABINETRY CONSIDERATIONS

High bias amplifiers dissipate much of the power they consume in heat.

Because the KSA-100S/200S/300S utilize Sustained Plateau Biasing, they

remain cool when not in use. Whenthe KSAis in use, it can become quite

hot. Therefore, the KSAshould be installed in a location that provides

unobstructed ventilation. If you must install the unit on shelves or in a

cabinet, extra ventilation may be necessary. This often can be accomplished

with cabinet shelf spacing or unit location. In more extreme instances the

use of small fans can aid in removing excessive heat from internal spaces.

Consult your dealer for assistance.

Generally, with the front and rear of a cabinet open, 3-4 inches of clearance

on each side and 8 inches of vertical clearance, the amplifier should have

adequate ventilation.

The KSAamplifiers have very large power supplies. As a consequence the

amplifiers are quite heavy. Whenpurchasing a rack or cabinet, keep weight

in mind. Most racks are not capable of withstanding the weight of these

units.

The exact weight and dimensions for the KSA-100S/200S/300S are in the

Specifications section of this manual.

AC POWER CONSIDERATIONS

The KSAshould have a dedicated 20 amp line and should only be operated

with the power cord supplied. Use of other power cords may damage the

amplifier and void its warranty. Please consult KRELLor your dealer

BEFOREusing any devices designed to alter or stabilize the ACpower for the

KSA. AC line filters and/or stabilizers must meet or exceed the power

transformer size in the amplifier. As an example, the line conditioner will

require a supply reservoir greater than 2800 VAto condition a KSA-200S.

If you have any questions about placement or ACpower conditions, please

consult KRELL.

PAGE 6

BASIC INSTALLATION

AMPLIFIER FEET

The feet on the KSAcan be used in several different ways. They are made from

machined Delrin and are supplied with separate threaded rubber bottoms.

The rubber bottoms can be screwed into the feet for protection of fragile

surfaces such as hardwood floors or furniture. For use on rugs, we

recommend using the feet without the rubber bottoms. KSAfeet can also

accept the KRELLAMDs(Acoustic Mass Damper). The AMDis a type

spiked foot that threads into the bottom of the foot. These improve the

amplifier’s sonic performance in most installations and are particularly

effective on carpeted floors. Please contact your dealer or KRELLwith any

questions.

REMOTE, MASTER/SLAVE CONNECTIONS - LINKING MULTIPLE

AMPLIFIERS

There are two Remote connectors on the back of the KSAlabeled Master and

Slave provided for linking multiple amplifiers together. Whenthe Master/

Slave cables are connected to each of the amplifiers involved, their meter

function controls and On/Off capabilities will be linked and controlled from

one amplifier.

Select the amplifier that you want to receive operation commands. That

amplifier will be the Master. Follow the instructions below for connecting the

amplifiers. Consider the Master receptacle the output and the Slave recep-

tacle the input.

1. Turn all of the amplifiers Offand unplug them from the ACwall receptacle.

Plug the amplifiers back in but do not turn them on before starting. This

ensures all amplifiers are synchronized when the cabling is connected.

Connect one end of the linking cable to the Master output on the back panel.

2. Connect the other end of the linking cable to the Slave Input on the second

amplifier.

3. To synchronize three amplifiers, connect a second linking cable to the

Master output on the second amplifier. Connect the remaining end to the

Slave input on the third amplifier.

PAGE 7

BASIC INSTALLATION

4. Connect additional amplifiers as described in step 3.

5. Whenthe cables are all in place, point the remote control at the amplifier

designated as Master and press the Power button. The amplifiers will all turn

on at the same time.

The meter display for each amplifier may vary. Manually change the meter

display via the front panel until all of the meters match. The amplifier will

remember the meter setting when cycled On/Off via the remote control or

front panel switch. If the unit is unplugged the memorywill not remain and

the meters may need to be resynchronized. Whenlinked and synchronized

correctly, ON/OFFand meter functions will happen simultaneously only

when the remote control is used.

NOTE: Each individual amplifier canbe turned ON/OFF and have meter

functions changed via the front panel separately. If you change an individual

amplifier’s function, it needs to be manually changed back to follow the

functions of the other amplifiers so the synchronization remains intact.

NOTE: Contact your dealer or KRELLIndustries to obtain remote cable

links.

PAGE8

CONNECTIONS

INPUT AND OUTPUT CONNECTIONS

CAUTION:When making connections to this component or any other, make

sure the power amplifier is OFF and the preamplifier is in the MUTEor

STAND-BY mode.

The wiring to and from the amplifier, and all components in, general, should

be arranged in a neat, organized manner. Specifically, ACwires should be

separated from audio wires. This practice avoids hum or other unwanted

noise from being induced into the system.

1. Connect the speaker cables to the amplifier’s output terminals.

The KSAutilizes two custom sets of parallel binding posts for the left and

right channels respectively. This configuration makes cable connections

and bi-wiring simple. The binding post will only accept a spade lug or ring

terminal of proper inner radius. Bare wire, banana lugs or pins will not work.

Each binding post is labeled either (+) or (-) between the sets of posts on

rear panel. The (+) sign between the binding posts indicates the positive

output terminal. This is commonly referred to as red or hot. The (-) sign

between the binding posts indicates the negative output terminal. This is

commonly referred to as black or ground.

CAUTION:Makesure all cable terminations are of the highest quality, free

from frayed ends, shorts or cold solder joints.

2. Connect the interconnect cables from your preamplifier to the input of the

KSA.

The KSAhas balanced and single-ended inputs ’. The balanced inputs use 3-

pin XLRconnectors and the single-ended inputs use standard RCAconnec-

tors. Werecommenduse of balanced interconnects sonically, and electrically

because of their ability to reduce noise and not incur significant sonic loss

due to extreme cable lengths.

CAUTION:Use only one input to the amplifier at a time. The KSAis shipped

with shorting pins in the XLRinputs. These pins should remain in the XLR

inputs if you are operating the KSAin the single-ended mode. When the

shorting pin is inserted, pin 1 and pin 3 are shorted together. The shorting

pins must be removed to connect the KSAfor balanced operation.

PAGE 9

CONNECTIONS

The pin assignment for the XLRis:

pin 1 = shield (ground)

pin 2 = non-inverting input (hot)

pin 3 = inverting input

NOTE:The RCAcenter conductor for each channel is wired in parallel with

pin 2, the non-inverted input. Only one of these inputs should be connected

to a preamplifier. Do not attempt to use the single-ended and balanced

inputs simultaneously.

3. Insert the ACpower cord into the receptacle located on the back of the

KSA.Insert the other end into the wall ACreceptacle. (Refer to the Basic

Installation section, for ACpower requirements)

4. The amplifier is now ready for operation. Should you have any questions

regarding system set-up, contact your dealer or KRELLIndustries.

PAGE 10

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