Acoustic Image Clarus 2R Owner's Manual - Page 4

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notch/low cut filter in each channel and a master level control that affects

both channels.

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 25 dB.

Notch/Low Cut Filter

The notch/low cut 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

800 Hz, depending on the position of the control. Approximate frequency

settings are noted on the frequency control. Note that the first half of the

control's rotation affects frequencies from 30 to 70 Hz, the last half of the

rotation affects frequencies between 70 and 800 Hz. This is done so that there

is plenty of control in the critical low frequency range. The notch 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. To use either, push

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

notch/cut switch. Start with the control fully counterclockwise and gradually

turn it clockwise until the desired effect is achieved. Experiment with the

position of the control to give you the sound you like best.

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

Phantom power

XLR

input

¼ inch

Input

input

buffers

Combo jack

Signal Flow Diagram

Effects

Send

Phantom

Loop

Level

Bass

Mid

Treble

Level

Input

Return

Clarus 1 and Focus 1 Control Panel

Preamp

Ch 2 input, EQ and filter

(same as Ch 1 below)

3 band EQ

Bass

Mid

Treble

Pre EQ

outputs

Input

level

Power

Notch Cut

Filter

Post

Mute

Off On

800

Freq

Master

Off

Ground

lift

Direct Out

Filte

Notch

Cut

N/C Switc

Filter

switch