Acoustic Image Clarus 1 Series III Manuel du propriétaire - Page 4

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the push button switch located next to the connector. To avoid an audible "pop",

set the mic input level control all the way off when switching on the phantom

power. An LED indicates when phantom power is on. The two channels of the

Clarus+ can be blended to mix two instruments, 2 microphones or a mic and an

instrument thereby performing much like a small PA system.

Controls

The preamp has the following controls in each channel: input level, bass, mid,

treble and effects level. In addition, there is a variable frequency notch/low cut

filter in each channel (low cut and phase reverse in Clarus+) and a master

level control that affects both channe

ls.

Level

The input level controls the level of the signal at the input stage of the preamp.

The master volume controls the level of the signal at the output of the preamp

(at the input of the power amp). Set the master control at "12 o'clock" and the

input level at zero. The input level should then be used to control the overall

output of the unit. The two controls are provided to allow independent control of

"house" volume and "stage" volume when the unit is used on stage with a

connection to a house PA. See the discussion under "Direct Out" below.

Tone

Each tone control has a center detent at the flat position. Experiment with

settings to achieve the frequency balance that sounds best to you. In general,

small values of boost and cut are best. The amp is designed with flat frequency

response so only minor corrections should be required to compensate for room

effects or "peaky" pickups in order to maintain the balanced response desired

for acoustic instrument amplification. To minimize electronic noise, avoid

operating all controls simultaneously at their maximum settings.

The bass control is a shelving-type that affects frequencies below 250 Hz and

with a maximum boost/cut of 15 dB. The mid control affects frequencies

between 300 Hz and 2000 Hz and has a maximum boost/cut of 15 dB. The

treble control is also a shelving-type that affects frequencies above 1000 Hz

with a maximum boost/cut of 15 dB.

Notch/Low Cut Filter/Phase Reverse

The Clarus 1 has a notch/low cut filter, the Clarus+ has low cut filter and phase

reverse switch.

The notch/low cut filter

in the Clarus 1

variable frequency type that inserts either an 18 dB cut or a 12 dB per octave

rolloff at frequencies between 30 and 400 Hz, depending on the position of the

control.

The low cut filter in the Clarus+ is the same as the one in the Clarus 1.

Approximate frequency settings are noted on the frequency control. Note that

the first half of the control's rotation affects frequencies from 30 to 60 Hz, the

last half of the rotation affects frequencies between 60 and 400 Hz. This is done

so that there is plenty of control in the critical low frequency range.

filter is used to remove a given feedback frequency to reduce feedback "howl".

The low cut filter is used to reduce the bass output in cases where room

location or instrument/pickup combination results in "boomy" sound. Press the

is a fixed amplitude,

The notch

-10 dB MIC

ATTEN

OFF

INPUT BUFFERS

-10 dB MIC

ATTEN

OFF

INPUT BUFFERS

Effects

Send

Phantom

Loop

Level

Bass

Mid

Treble

Level

Input

Return

Clarus 1 Control Panel

FILTER

PHASE INV

OFF

CUT

180

PRE EQ OUT

BUFFER

FILTER (CLARUS 1)

FILTER

PHASE INV

OFF

CUT

180

Power

Notch Cut

Filter

Post

Mute

Off On

800

Freq

Master

Off

Ground

lift

Direct Out