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KSA-i400 Power Amplifier

Owner’s Reference

KSA-i400 Owner’s Reference

Table of Contents

Page

Getting Started 3

Unpacking / Placement / AC Power Guidelines 4

Front Panel 5

Rear Panel 6

Operation 8

Protection Modes 11

Specifications 12

Warranty 14

Service 15

Krell Contact Information 15

KSA-i400 Owner’s Reference

Getting Started

Thank you for your purchase of a Krell KSA-i400

component. The KSA-i400 is a high performance

amplifier incorporating all of Krell’s best

technologies - iBias™ for true Class A operation up

to 400 watts per channel but without the constant

heat of traditional Class A designs, XD for low

output impedance that maintains firm control over

the speakers for hard hitting tight bass and brilliant

highs, and Sym-Max which virtually eliminates 2

order harmonic distortion for a more realistic 3D

musical experience.

WA R N I N G ! Do not place the component where it

could be exposed to dirt or excessive moisture. The

ventilation grids on the top, bottom, and sides of

the KSA-i400 must be unobstructed at all times.

Do not place flammable material on top of or

beneath the unit. When making connections to this

or any other model, make sure all components are

off. Turn off all system power before connecting the

KSA-i400 to any other component. Make sure all

cables are of the highest quality, free from frayed

ends, short circuits or cold solder joints.

CAUTION! The top, sides, and bottom of the

KSA-i400 may get hot during use.

This product complies with the EMC

directive (89/336/EEC) and the low-

voltage directive (73/23/EEC). This

CLASS 1 apparatus must be

connected to an AC MAINS socket

outlet with a protective earthing

connection.

WARNINGS

CAUTION

NO USER SERVICEABLE PARTS INSIDE.

RISK OF ELECTRIC SHOCK

DO NOT OPEN

KSA-i400 Owner’s Reference

Unpacking / Placement / AC Power Guidelines

Unpacking

The KSA-i400 is very heavy and requires two strong people to lift it and position it.

Place the shipping box on a firm level surface. Lift off the top of the shipping box and remove the small

cardboard box located in the center of the protective foam. This box contains a power cord and a

12V trigger cable. Remove the top protective foam. The unit can now be lifted out of the bottom part

of the shipping box and placed in the desired location.

Placement

The KSA-i400 may generate substantial heat while in operation and is intended for use indoors in a

typical residential environment. Place it on a firm level surface where it will not be exposed to

excessive heat, humidity, dust, or moisture of any kind. Krell recommends that it be placed in open

air and not in an enclosed cabinet or rack. The bottom, sides, and top must remain unobstructed in

order to maintain adequate air flow. Do not place it directly on a deep pile carpet. It should not be

placed on top of other equipment nor should other equipment be placed on top of it. Please contact

Krell if it must be placed in a rack as forced air circulation will be required.

AC Power Guidelines

The KSA-i400 requires a dedicated AC circuit rated at a minimum of 20 amps for 100-120VAC

operation or 13 amps for 220-240VAC operation. Do not use extension cords, adapters, or power

strips. Krell does not recommend the use of power conditioners with the KSA-i400.

KSA-i400 Owner’s Reference

Front Panel

1) Power Button

2) Indicator Lights

Front Panel Features Description

1) Power Button

The primary function of the power button is to switch the unit from stand-by to operate or

operate to stand-by. It may also be used to start a software update or a factory restore.

See the Operation section for more information about these functions.

2) Indicator Lights

The indicator lights provide information about the status of the unit. Solid green indicates

stand-by

and solid blue indicates

. See the Operation section for more information about

status.

2 2

KSA-i400 Owner’s Reference

Rear Panel

1) AC Mains Inlet

2) Power Switch

3) 12VDC Trigger Input

4) RJ45 Ethernet Jack

5) Speaker Binding Post, Positive

6) Speaker Binding Post, Negative

7) RCA (single-ended) Input Jack

8) XLR (balanced) Input Jack

2 3

5 5

7 8 7

KSA-i400 Owner’s Reference

Rear Panel Features Description

1) AC Mains Inlet

IEC 320 inlet for connection to an AC mains outlet. See the serial number label on the rear

panel of the unit for the specific voltage requirements. Use only the supplied power cord or

one with an equivalent current rating.

2) Power Switch

Move the power switch to the up position to apply power to the unit or the down position to

remove power. The power switch is also a circuit breaker. In the event of an internal fault it

may automatically move to the down position to remove power from the unit.

3) 12VDC Trigger Input

For connection to a home control system or other component with a 12VDC trigger output

to switch the unit on (+12V) or off (0V). This input accepts a 3.5mm mono plug where the

tip is hot and the sleeve is ground.

4) RJ45 Ethernet Jack

For connection to a LAN (local area network) at speeds of 10/100 Mbps. This must be

connected to the LAN router in order to access the embedded web page. The router must

have access to the Internet in order to get software updates.

5) Speaker Binding Post, Negative

Connect the negative wire from the speaker to this post. The binding post accepts 5/16”

(8.0mm) spade connectors, bare wire, or banana plugs. This is internally connected to

ground.

6) Speaker Binding Post, Positive

Connect the positive wire from the speaker to this post. The binding post accepts 5/16”

(8.0mm) spade connectors, bare wire, or banana plugs.

Caution! – Hazardous voltages may be present on this post when the unit is

in operation. Do not touch.

7) RCA (single-ended) Input jack

RCA jack for connection to single-ended analog audio sources (2.7Vrms maximum input

voltage). Insert the shorting jumper between pins 1 and 3 of the XLR jack when using this

input.

8) XLR (balanced) Input Jack

XLR jack for connection to balanced analog audio sources (2.7Vrms maximum input

voltage). Pin 1 is ground, pin 2 is non-inverting (+), and pin 3 is inverting (-).

Krell recommends balanced input connections for the best performance.

KSA-i400 Owner’s Reference

Operation

Power

Connect the KSA-i400 to an AC mains outlet and turn on the rear panel power switch. After about 4

seconds the front panel indicator lights will illuminate green. The unit is now in stand-by. Wait

another 8 seconds then press and release the power button. An audible click will be heard from the

unit and the indicator lights will fade from green to blue. The blue illumination will fade out and in for

about 8 seconds and then remain constant. The KSA-i400 is now ready to play. To return to stand-by

press the power button again.

Web Interface

The KSA-i400 has a Web interface that provides status information and the ability to remotely control

the unit. It is easily accessed with most commonly available Web browsers. First, with the unit off,

connect an Ethernet cable from the rear panel jack on the KSA-i400 to the LAN router. Turn on the

rear panel power switch. Open a Web browser on a device connected to the same LAN and type

http://krell-ksai400-xxxx.local

into the URL window (

xxxx

is the last four digits of the serial

number).

When the KSA-i400 is in stand-by the Web page will be grayed-out and only the Power button will be

active. Click on the Power button to turn on the unit. The KSA-i400 will turn on and a few seconds

later the Web page will come up to full brightness and various status information will be displayed.

About 15 seconds later the temperature display will appear. Channel 1 is the right channel and

Channel 2 is the left channel. During use it is normal for there to be a difference of a few degrees

between the channels.

The No Signal Timeout feature will put the KSA-i400 in stand-by if an input signal is not detected

during the selected time period. The default setting is Disabled.

KSA-i400 Owner’s Reference

Web page KSA-i400 in stand-by

Web page KSA-i400 on

KSA-i400 Owner’s Reference

Factory Restore

This will restore any internal settings back to their factory default values. Turn on the KSA-i400 from

the rear panel. Wait 2 seconds after the green stand-by lights come on then press and hold the

power button until the green lights begin to fade out and in; release the power button. After about 13

seconds the lights will go off and then come back on steady. The factory restore is done.

If the Web interface is inaccessible and the LAN connection is good, a factory restore may solve the

problem.

Software Update

Note: Upon reaching a certain point in the update process power must not be removed from the

KSA-i400. If this happens, the unit may be rendered inoperable. Read through the entire

software update process before attempting to perform a software update.

From time to time Krell may release new versions of software to add features or fix a problem. The

KSA-i400 must be connected to the LAN router with access to the Internet in order to perform the

software update. With the KSA-i400 in stand-by press and hold the power button until the green

stand-by lights begin to flash; release the power button.

While the green lights are flashing the unit is checking for newer software. If they stop flashing and

stay steady that means the unit already has the latest software. If the lights change to red that

means it was unable to connect to the server to check for software updates. This can be caused by

a lack of connection to the LAN or the router not allowing the KSA-i400 to connect to the Internet.

If there is new software available, the lights will start to flash blue. The KSA-i400 is downloading the

software update. If the lights change to red that means the download failed. Sometimes this can be

caused by slow response over the Internet. Try the software update again later.

When the unit is done downloading the software the lights will flash blue with two flashes per period.

The unit is copying and verifying the software download. If the lights change to red there was a

problem with the downloaded file. Try the software update again later.

Do not turn the unit off or otherwise remove power beyond this point in the software

update process!

The lights will go off at this point and then come back on blue, fading in and out rapidly. The program

memory is being overwritten. The lights will then go off briefly and then come back on steady green.

The KSA-i400 is in stand-by and is ready to use.

Indice

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