Acoustic Image 550 IA Benutzerhandbuch - Seite 6

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Mute Switch

A switch is provided to allow you to mute the output of the amplifier without

having to turn the amp off. This will allow you to tune your instrument on stage

without being heard. The amp output and direct out signals are both muted by

the switch. The mute switch has a red button on it to remind you that it is an

important switch.

If you are not getting any sound out of the amp, check to

make sure that the mute switch is off.

Stereo Operation (Clarus+)

The two-channel preamp of the Clarus+ can be operated in stereo mode.

When it is in the "on" position, the switch labeled "Ch 2" connects the channel to

the internal power amp. When it is in the "off" position, it is disconnected from

the internal amp but is accessible from the channel 2 send output. By

connecting the send output to a satellite power amplifier, and putting the switch

in the off position, the preamp operates in stereo mode. Note that channel 2

remains in the direct out signal even when the switch is in the off position. This

is done since stereo operation is typically a "Stage" mode but not a "house"

mode (house systems are typically not stereo).

button to remind you that is is an important switch.

not be heard through the speaker system connected to the amplifier

unless the Ch 2 switch is in the depressed or on position. If you are not

hearing channel 2 in the output, check to be sure that the switch is on.

Effects (Clarus+)

Our high-quality effects units offer 6 program selections: 3 reverb programs

(Hall, Room and Plate), a delay, an ambient chorus and a flanger. There are

switches to select which of the two channels are processed by the effects unit.

Either channel can be connected to the effects unit. If both switches are

engaged, the selected program appears in both channels. A level control

affects the level of the reverb signal that is mixed with the "dry" signal to control

the overall effect of the selected program. You should experiment with both the

program selection and the level control to find the sound that you prefer. When

effects are not used, the switches for both channels should be off and the level

control should be turned fully counterclockwise.

noisy, it is normal the hear the modulation of the flanger when no signal is present.

Headphone Output (Clarus+)

There is a headphone output on the rear panel of the Clarus+. You can plug a

standard 1/4 inch stereo plug into this output to connect a headphone for

private listening. If your headphone has a 1/8th inch plug, you can buy an

adapter to allow you to use the 1/4 inch output jack.

When you plug into the jack, the amp is muted. Sound will only be heard

through the headphones. The headphone is connected to the output of the

preamp so all of the controls on the preamp, including effects, will affect the

signal heard through the headphone. When the headphone plug is removed

from the jack, the amp will come back on.

between removal of the plug and the amp coming back on, so expect a

The Ch 2 switch has a red

Note that channel 2 will

Note that the flange effect is

There is about a 5 second delay

pause before you will hear anything from the amp after the headphone is

removed. Anytime anything is plugged into the headphone output jack, the

amp will be muted so make sure that nothing is plugged into the jack when you

want to use the amp normally.

Power Amp

Speakers are connected to the amps via Neutrik Speakon connectors ("twist

lock" type). These connectors are used because of their low contact resistance

and non-shorting operation. The output of each Speakon connector is wired to

pole "1." Make sure the cables you use to connect a speaker are similarly

wired.

The power amp of both amps is capable of driving speaker loads as low as 2

ohms. Use a high quality speaker system in order to get the maximum

performance from the amp. The Acoustic Image Contra EX or Corus EX are

excellent choices.

The power amp is short circuit protected. If a short is connected to one of the

speaker jacks, the output signal will be interrupted until the short is removed. If

a short is present, you will hear a ticking sound at 3 to 4 second intervals which

indicates that the short circuit protection is working.

you should shut off the power to the amp before connecting or

disconnecting speakers from the unit.

We highly recommend the use of Speakon connectors at both the amp and

speaker ends of the connecting cable. If you use these connectors, you will get

the highest possible performance and reliability from your amp. Conversion of

your speaker to Speakon connectors is a simple job. Contact your local repair

shop or Acoustic Image for more information. A Speakon to 1/4 inch adapter is

included with the amp to be used in emergency situations when you cannot find

a Speakon to Speakon cable.

All Acoustic Image amps can be operated without a speaker load if required.

When operating without a speaker attached, turn the master level to zero

(all the way counterclockwise). This will prevent the power amp section

of the amp from being driven and protect it from damage.

Amp Placement

The small size and light weight of the amps allow them to be placed almost

anywhere that is convenient for the performer. The best results will be achieved

from the amp/speaker combination if the resistance of the speaker cable is

kept as low as possible. That means that a shorter cable is better.

Care

The amp chassis is made of powder coated aluminum. A little caution in how it

is handled will keep it looking new for years to come. Use a clean, dry cloth to

wipe the surfaces of the amplifier. Note that there are no user-serviceable parts

inside the amp. Refer servicing to qualified Acoustic Image or other

technicians.

To be on the safe side,