- ページ 5

アンプ Acoustic Image 401 IAのPDF オーナーズマニュアルをオンラインで閲覧またはダウンロードできます。Acoustic Image 401 IA 6 ページ。 Integrated amplifiers clarus 1; clarus 1r; clarus 2; clarus 2r; focus 1; focus 1r; focus 2; focus 2r; clarus sl; clarus sl-r

ページを印刷する

Notch/High Pass Filter

The notch/high pass filter is a fixed amplitude, variable frequency type that

inserts either an 18 dB cut or a 12 dB per octave rolloff at frequencies between

30 and 700 Hz , depending on the position of the control. The notch filter is used

to remove a given feedback frequency to reduce feeback "howl". The high

pass filter is used to reduce the bass output in cases where room location or

instrument/pickup combination results in "boomy" sound. To use either, push

the on/off switch to turn on the filter circuit then select the filter type using the

notch/high pass switch. Start with the control fully counterclockwise and

gradually turn it clockwise until the desired effect is achieved, then experiment

with the position of the control to give you the sound you like best. The Clarus

SL's do not have the filter capability.

Effects Loop

Acoustic Image preamps have output ("Send") and input ("Return") capability

in each channel to allow you to use effects boxes. The send output is affected

by the input volume and tone controls and can also be used as a preamp output

for driving other power amplifiers. The Return input can be used to directly

connect an external preamp to the unit's power amp. The effects level control

in each channel controls the volume of the returned ("wet") signal relative to

the original ("dry") signal. Because the effects loop is a parallel type, plugging

something into the send output does not interrupt the signal path. So, a tuner

can be plugged into the send output without affecting the signal going through

the amp. When the effects loops are not used, the level controls should be set

at zero. The Clarus SL's do not have the effects level control.

Direct Out

An XLR jack is provided for a Direct Out connection that allows the system's

output to be fed to mixing boards of house PA systems or recording studios.

As a result, the instrument amplified by the unit can be recorded or further

amplified by the house PA system. In the two-channel amps, the Direct Out

signal is the combined output of the mic and instrument channels and it is

affected by the input level and tone controls of each channel (post EQ). Any

reverb signal selected is also present in the direct out signal.

A ground lift switch is available to "lift" the ground from the output of the direct

out--reducing noise should a ground loop create hum when the unit is

connected to a mixing board. The Clarus SL's do not have the ground lift switch.

Reverb (Clarus/Focus 1R, Clarus/Focus 2R and Clarus SL·R only)

Our high-quality digital reverb units offer 8 program selections: 2 "Hall"

(Concert Hall and Arena), 3 "Room" (Club, Chamber and Garage), 2 "Plate"

reverb simulations (Plate and Vocal), and 1 "Spring" reverb simulation. The

Clarus SL·R offers 3 program selections, Concert Hall, Club and Spring. With

the Clarus/Focus 2R, there are also switches to select which channel (mic or

instrument) has reverb added. If both switches are closed, the selected reverb

setting 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

reverb. You should experiment with both the reverb program selection and the

level control to find the sound that you prefer. When reverb is not used, the

switches for both channels should be off and the level control should be turned

fully counterclockwise.

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. Cables with Speakon connectors are available from Acoustic

Image if you are unable obtain them from your local music store. One Speakon

to 1/4 inch cable is supplied with the unit.

The power amplifier is capable of driving speaker loads as low as 2 ohms (4

ohms for the Focus amps). Use a high quality speaker system in order to get

the maximum performance from the amp. The Acoustic Image Contra EX is an

excellent choice.

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 there is an intermittent short, the output will be interrupted for about one

second each time the short appears. However, the nature of a switching

amplifier makes it difficult to protect against shorts in all circumstances. To

be on the safe side, 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.

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 counter clockwise). 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 preformer. The best results will be

achieved from the speaker/amp combination if the resistance of the speaker

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