Classe Audio OMICRON Bedienungsanleitung

OMICRON ISSUE 2 DEC ‘98

CLASSÉ AUDIO

OMICRON

POWER AMPLIFIER

OMICRON

OWNER'S MANUAL

OMICRON ISSUE 2 DEC ‘98

CLASSÉ DESIGN PHILOSOPHY

1. REPEATED LISTENING DESIGN SESSIONS:

Fine tuning of sound by exchanging and mixing of parts (transistors, capacitors, wiring, PCB

boards etc.), and adjusting many specific operating voltages within proper engineering ranges,

producing an overall sonic recipe giving the most natural harmonic realism of music typical of

instruments in a live performance.

2. CIRCUIT DESIGN:

The OMICRON is based on Classé’s whole history of designing and building High End

amplifiers.The OMICRON is an Ultra- High performance amplifier of incredible sonic realism

capable of transmitting to the listener the emotional essence of the music. The OMICRON is

actually two completely separate amplifiers with two massive toroidal transformers totalling 3.6

KVA, each with their own power cords and a huge storage capacity which totals over 80000 uF

per channel. The OMICRON has fourteen high voltage/current Bi-Polar output devices per

channel. Discrete high voltage/current voltage regulation for the pre-driver and input sections.

Also featured are heavily gold plated bars connecting supplies of the output devices. Gold plated

input and output connectors. Oxygen free copper wiring. All signal carrying cables are shielded

and have Litz type configuration. The OMICRON is symmetrical from input to output

3. EXTREME LONG LIFE IN REAL WORLD CONDITIONS:

Choosing the best attainable quality parts and materials combined with the advantages of the two

above-mentioned areas provides Classé owners with years of proven trouble free reliability and

musical enjoyment.

OMICRON ISSUE 2 DEC ‘98

OMICRON

OWNER'S MANUAL

TABLE OF CONTENTS

UNPACKING & SET-UP.......................................................................... 4

GENERAL CONNECTIONS..................................................................... 5

CONNECTIONS FOR REGULAR AND BALANCED INPUTS…….... 8

PROTECTION CIRCUIT.....................................................….….…….... 10

IR IN AND OUT………………………………………………………… 11

SPECIFICATIONS.................................................…..........….………..... 14

OMICRON ISSUE 2 DEC ‘98

UNPACKING & SET-UP

Your CLASSÉ OMICRON power amplifier is packed in high density, semi-rigid foam

placed in a special Fiberglas case. To remove the unit, put the fibreglass case with the Classé

lettering right side up. Unlock the four (4) case locking devices by first lifting the tabs, and turning

them fully counter clockwise. Then, pull the tabs; the locking devices will pivot downwards. You

can now remove the large top portion of the case. Take the unit out of the base of the case and

remove the plastic bag and inspect the unit for any concealed damage. Apart from the owner's

manual, please ensure the following has also been included:

1) Two (2) detachable A.C. linecord

2) Nut driver for output connectors

Please report any damage or missing parts to your dealer immediately.

Place the OMICRON at or near its final set-up position, allowing 8 inches at the rear for

tightening the speaker output connectors.

The power transformers in the OMICRON are located at the front-center of the unit.

Ideally, a few feet should separate this area from components which potentially could pick up hum.

These include preamplifiers, turntables, and interconnect cables. In terms of providing adequate

airspace for cooling, a good rule of thumb is to allow 6 inches above and 3 inches on each side of the

unit.

Check the Serial Number sticker on the back of the unit for the correct operating voltage.

The OMICRON has two external AC fuses, the rating of which should be as follows:

LINE VOLTAGE FUSE RATING

100 or 120 V.A.C. 2X 15 AMP SLOW BLOW, 125 or 250 volts

220 or 240 V.A.C 2X 12 AMP SLOW BLOW, 250 volts

OMICRON ISSUE 2 DEC ‘98

GENERAL CONNECTIONS

A.C. LINE

Insert the 2 linecords into the A.C. receptacle on the rear of the unit. PLEASE MAKE

SURE YOU HAVE PREVIOUSLY HOOKED UP THE SPEAKERS AND PREAMPLIFIER

TO YOUR AMPLIFIER BEFORE CONNECTING THE AC POWER CORD TO THE

AMPLIFIER.

IMPORTANT NOTE

CAUTION: SAFETY INSTRUCTIONS

DISCONNECT THE 2 AC LINE CABLES BEFORE MAKING ANY OTHER

CONNECTIONS. "FLOATING THE GROUND” OR DEFEATING THE GROUND ON A

3-PRONG LINECORD MAY CREATE A SHOCK HAZARD. CONNECT ALL INTERCON-

NECT CABLES BETWEEN THE ELECTRONICS BEFORE CONNECTING THE A.C.

LINECORDS TO THE WALL OUTLETS. THIS WILL REDUCE THE POTENTIAL SHOCK

HAZARD.

STEREO

Input and output connectors are clearly marked on the back of the amplifier. Left/Right

connections are oriented from the front of the unit. Stereo output connections are marked above the

connectors. Switch stereo/mono switch to STEREO position. (The OMICRON is preset at the

factory for STEREO.)

Use only high quality interconnect and loudspeaker cables, and make all connections tight. If

the RCA input plugs are loose, remove them and pinch down the ground leaves slightly with pliers.

Observe correct phasing of the loudspeaker connections, and tighten.

OMICRON ISSUE 2 DEC ‘98

STEREO (CONTINUED)

DO NOT OVERTIGHTEN the output connectors. When powering up the OMICRON in stereo

mode, the left channel LED will blink for approximately 20 seconds, when the sequence is

completed, the LED will turn SOLID RED. Then, the right channel LED will also blink for

approximately 20 seconds and will also turn solid red once it has completed its turn on sequence.

MONO

Please read through the previous Stereo section for general notes on securing good

connections, and safety tips. If the unit has been previously used in stereo, make sure it is OFF, and

remove all connections, including the AC line cable. Make sure the STEREO/MONO switch is

switched to the MONO position. NOTE: The Stereo-Mono switch will not operate if the amplifier is

turned on, you will NOT be able to change from one mode to the other, as the mode is “locked”

while the amplifier is on.

When the turn on sequence has been completed with the unit set for MONO operation, only

the CENTER LED will light up.

The MONO "Input" is the "left channel input", as marked. The unused right channel input is

automatically disconnected. Correct output phase MONO connections are marked below the

connectors.

Repeat the above MONO settings and connections on the second OMICRON to be used for

the other channel.

Please remember that the negative output connection of a bridged amplifier is NOT a

ground. Do not use a "common ground” switch-box set-up. Do not use with electronic crossovers

which have a common ground. Connecting two bridged amplifiers to a common ground device of

any sort will cause the amplifiers to fail.

OMICRON ISSUE 2 DEC ‘98

MONO OPERATION

As stated above, either the regular or balanced inputs can be used in stereo or mono.

Connect a single interconnect, either regular or balanced, to the left channel input of each amplifier.

See the "Mono" section above for complete details. NOTE: Neither the Stereo-Mono switch nor the

REGULAR/ BALANCED switch will operate while the amplifier is turned on. You will NOT be able to

change from one mode to the other, as these modes are “locked” while the amplifier is on. To

activate the circuit, turn off the unit and engage the STEREO/MONO switch to REGULAR. If the unit has

not been turned off before engaging the switch, turn off the unit, wait for about 10 seconds, and turn

the unit on again, the circuit will then engage.

OMICRON ISSUE 2 DEC ‘98

CONNECTIONS FOR REGULAR OR BALANCED INPUTS:

The CLASSÉ OMICRON power amplifier is equipped with both regular and balanced

inputs. Either one may be used SEPARATELY, BUT NOT SIMULTANEOUSLY. The balanced inputs

must be connected to a preamplifier which has balanced main outputs. Balanced interconnects with

"XLR" connectors are also required. Regardless of the amplifier inputs used, stereo or mono

operation is possible on the OMICRON.

REGULAR INPUTS

Engage the REGULAR/BALANCED switch to the position marked "REGULAR". (The amplifier is

factory set for “REGULAR”.) NOTE: The REGULAR/ BALANCED switch will not operate if the

amplifier is turned on; you will NOT be able to change from one mode to the other, as the mode is

“locked” while the amplifier is on. To activate the circuit, turn off the unit and engage the

REGULAR/BALANCED switch to REGULAR. If the unit has not been turned off before engaging the

switch, turn off the unit, wait for about 10 seconds, and turn the unit on again, the circuit will then

engage. Connect the regular interconnects to the RCA input jacks on the rear panels of the

OMICRON. The balanced connectors are automatically disabled.

BALANCED INPUTS

Switch the

REGULAR/BALANCED switch to the position marked "BALANCED". A balanced

preamplifier and balanced interconnects are also required. NOTE: The REGULAR/ BALANCED switch

will not operate if the amplifier is turned on; you will NOT be able to change from one mode to the

other, as the mode is “locked” while the amplifier is on. If the unit has not been turned off before

engaging the switch, turn off the unit, wait for about 10 seconds, and turn the unit on

OMICRON ISSUE 2 DEC ‘98

BALANCED INPUTS (CONTINUED)

again, the circuit will then engage. For use with balanced preamplifiers other than Classé, the

wiring of the 3-pin XLR connectors must be matched to that of the CLASSÉ OMICRON which is

wired as follows:

PIN 1: GROUND

PIN 2: POSITIVE (NON-INVERTED) SIGNAL, “HOT”

PIN 3: NEGATIVE (INVERTED) SIGNAL

All Classé preamplifiers and amplifiers are configured as above. Some preamplifiers from other

manufacturers have PIN-3 set as the positive or “HOT” side. If this is true of your preamplifier, and

you wish to maintain absolute phase throughout your system, the interconnects must have the wire

which is connected to PIN-3 at the preamplifier output end switched to PIN-2 at the amplifier input

end and the wire which is connected to PIN-2 at the preamplifier output switched to PIN-3 at the

amplifier input end.

Having confirmed the correct connections, plug the XLR connectors of the balanced

interconnects into the locking XLR connectors on the rear panel of the OMICRON. Push the

connectors in until the locking mechanism clicks. (To remove the connectors, press the tab above the

connector while pulling gently on the connector body.)

OMICRON ISSUE 2 DEC ‘98

PROTECTION CIRCUIT

A special circuit in the Classé OMICRON continuously monitors the output audio signal to

detect output overload, clipping or DC content. In addition, each channel has two front end supply

voltage fuses, located on the front end voltage regulation board, to protect the input circuitry from

damage due to overload. There is a green LED for the negative voltage supply and a red for the

positive. If a fuse fails, the corresponding LED goes out, alerting you of the fact. (These fuses are 1

amp fast blow).

There are also line AC fuses, located at the rear of the amplifier immediately above each IEC

receptacle. There are no LEDs monitoring the condition of these fuses.

If the protection circuit of the unit is triggered or any of the fuses has blown, the FRONT

PANEL POWER LED(S) will go to BLINKING GREEN, indicating a “fault” condition. If the left

LED is BLINKING GREEN, the fault condition should be located at the left channel, if the right

channel LED is BLINKING GREEN, the fault will be located to the right channel regardless if the

unit is used in mono or stereo.

IF THE PROTECTION CIRCUIT HAS BEEN TRIGGERED, TURN THE OMICRON

OFF. .After the situation which has triggered the protection circuit has been clearly identified and

corrected, attempt to re-start the unit. IF THE UNIT STILL GOES INTO PROTECTION MODE,

OR IF IT APPEARS THAT PROTECTION FUSES DID BLOW, CONTACT YOUR LOCAL

DEALER. DO NOT TRY TO CHANGE A BLOWN FUSE. REPLACING A FUSE WITHOUT

CHECKING FOR COMPONENT FAILURE COULD RESULT IN FURTHER, SERIOUS

DAMAGE TO VITAL COMPONENTS IN YOUR AMPLIFIER. CONTACT YOUR LOCAL

DEALER or Customer Service at the Classé Audio, Inc --- (514) 636-63 84.

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