Acoustic Image Corus Gebruikershandleiding - Pagina 7

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to operate under these conditions with lower distortion or without

having the overcurrent circuit kick in. The limiter reduces the peak

signal that is driving the power amp, thereby reducing its peak output

with the result of lower distortion. If you find yourself having to play in

extreme conditions that cause the amp or combo to have too much

distortion or even signal interruption, engage the limiter and see if that

helps the situation.

Power Amp

Connecting a Speaker

Speakers are connected via Neutrik Speakon connectors ("twist lock"

type) located on the rear panel. 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 (and the speakers themselves) are

similarly wired.

The power amplifier 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 Coda EX, Corus EX

or Ten2 EX are excellent choices. As mentioned above, the power

amp is short circuit protected. If a short is connected to a speaker jack,

the output signal will be interrupted until the short is removed. Note

that when using a 1/4 inch type speaker plug, there is a momentary

short that occurs when the plug is put into the jack. That short can

cause a problem for the amp.

To be on the safe side, you should

shut off the power to the amp before connecting or

disconnecting speakers from the unit.

Operation Without a Speaker Connected

There may be times when you want to operate the amp without a

speaker connected to it. For example, you may want to record using

the Direct Out and don't want the output of the amp to be heard

through a speaker. In that case, set the master level to zero. By setting

the master level to zero, the signal to the power amp is turned off and it

is not driven without a speaker load which can damage the amp.

sure to set the master level to zero when a speaker load is not

connected to the amp. Operating the amp with no load and the

master level turned up can damage the amp.

Operation--Speaker Cabinets

Docking System

The amp head component of our combo amps can be removed and

used as a stand-alone amplifier. To remove the head unit, first

disconnect the speaker "pigtail" that connects the speaker cabinet to

the amp, then unscrew the docking screws on the rear panel until they

are loose. Grip the cabinet as shown and use the tips of your fingers to

push the head unit out. The fit is quite snug so some force will be

needed.

Once you have removed the head, you will notice the rubber feet

stored in a compartment on the bottom. Remove the feet and screw

them into the four positions on the bottom of the head. When you want

to put the head back into the cabinet, you will have to remove the feet

and put them back into the storage compartment.

To reinsert the head unit, grip the cabinet as shown and push it in with

your thumbs. Again, the fit is snug so some force will be needed. Once

the head unit is in place, tighten the docking screws to pull the head

tight to the docking plate. Reconnect the speaker cable and the unit is

ready to go.

Speaker Placement (Combos or Extension Cabs)

The omnidirectional low frequency output of our speaker cabinets

makes speaker placement relatively noncritical. You will easily be

heard all over the bandstand no matter where one or more are

located. However, best results are obtained when the cabinet is

placed on the floor. Putting the unit on a shelf or stand will reduce

bass frequencies. There may be circumstances where this is

desirable. Feel free to experiment to find the sound that is best for you.

Tilt Mechanism

In some settings, such as a hollow stage or small, "boomy" room, your

amp or enclosure will produce too much bass. One way to cut

unwanted bass output is to use the built in tilt back feature to lift the

front of the cabinet, reducing the coupling to the floor. To do this, pull

the stand into its forward position and set the combo in place on the

floor. The stand is spring loaded so when you pick up the unit, the

stand will spring back into its storage position. You may want to use

Removal

Insertion