Acoustic Image + Models - Manual (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.
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
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 400 Hz, depending on the position of the
control.
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. Press the
Controls
ls.
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.
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.
The Clarus 1 has a notch/low cut filter, the Clarus+ has low cut filter and phase
reverse switch.
in the Clarus 1
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.
Level
Tone
Notch/Low Cut Filter/Phase Reverse
4
Clarus 1 Control Panel
Level Level Bass Mid Master
Direct Out
Treble
Send
Return
Effects
Loop
Notch Cut
On Off
Freq
Input
Mute
Ground lift
Post
EQ
Off On
Phantom Filter
30
70
800
Power
PRE EQ OUT
BUFFER
INPUT BUFFERS
INPUT BUFFERS
OFF ON
-10 dB MIC
ATTEN
ON OFF
-10 dB MIC
ATTEN
FILTER
OFF
CUT
FILTER
OFF
CUT
180
PHASE INV
OFF
180
PHASE INV
OFF
FILTER (CLARUS 1)