Krell Industries KMA-i800 Guida rapida

KMA-i800 Power Amplifier

Owner’s Reference

KMA-i800 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

KMA-i800 Owner’s Reference

Getting Started

Thank you for your purchase of a Krell KMA-i800 component.

The KMA-i800 is a high performance monaural amplifier

incorporating all of Krell’s best technologies - iBias™ for true

Class A operation up to 800 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 2nd order harmonic distortion for a more

realistic 3D musical experience.

WARNING!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 KMA-i800 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 KMA-i800 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

KMA-i800 may get hot during use.

WARNING! The KMA-i800 is a differential output

amplifier. Both speaker terminals are live! The negative

speaker terminal is not connected to

ground.

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

KMA-i800 Owner’s Reference

Unpacking / Placement / AC Power Guidelines

Unpacking

The KMA-i800 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 KMA-i800 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 KMA-i800 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 KMA-i800.

KMA-i800 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 on. See the Operation section for more information about status.

Rear Panel

KMA-i800 Owner’s Reference

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

KMA-i800 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.

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

in operation. Do not touch.

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 (3.8Vrms 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 (3.8Vrms 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.

KMA-i800 Owner’s Reference

Operation

Power

Connect the KMA-i800 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 KMA-i800 is now ready to play. To

return to stand-by press the power button again.

Web Interface

The KMA-i800 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 KMA-i800 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-kmai800-xxxx.local into the URL window (xxxx is the last four digits of

the serial number).

When the KMA-i800 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 KMA-i800 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 side and Channel 2 is the left side.

During use it is normal for there to be a difference of a few degrees between the sides.

The No Signal Timeout feature will put the KMA-i800 in stand-by if an input signal is not detected during the selected time

period. The default setting is Disabled.

KMA-i800 Owner’s Reference

Web page KMA-i800 in stand-by

Web page KMA-i800 on

KMA-i800 Owner’s Reference

Factory Restore

This will restore any internal settings back to their factory default values. Turn on the KMA-i800 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 KMA-i800. 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 KMA-i800 must be

connected to the LAN router with access to the Internet in order to perform the software update. With the KMA-i800 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

KMA-i800 to connect to the Internet.

If there is new software available, the lights will start to flash blue. The KMA-i800 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 KMA-i800 is in stand-by and is

ready to use.

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