Acoustic Image Clarus Manual del usuario - Página 4
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optimized to get the best sound from piezo pickups. The XLR input is a
low impedance balanced input with sufficient gain to allow
microphones to be plugged into it. There is a switchable 10 dB pad to
attenuate the mic level when it is too "hot." Phantom power is available
through the connector for powering a mic or outboard preamp and can
be activated using the push button switch located next to the
connector. To avoid an audible "pop", set the input level control all the
way off when switching on the phantom power. An LED indicates
when phantom power is on. In the two channel versions, each channel
is identical and 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 low cut filter and a phase reverse switch 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 as a stage monitor with a
connection to a house PA. See the discussion under "Direct Out"
below.
The maximum volume at which the system will play is limited by the
capability of the speaker system. A 10-inch driver in a small cabinet
has a limitation in how loudly it will play. The 2x10 configuration of the
Te n 2 w i l l p l a y l o u d e r b u t i t s t i l l w o n ' t p l a y a t
"rock" levels. If more volume is needed, use an extension cabinet
(Coda EX, Corus EX or Ten2 EX) or take a feed from the Direct Out
jack to a PA system or another amplifier.
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.
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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.
Low Cut Filter/Phase Reverse
The amps have a low cut filter and phase reverse switch in each
channel. The low cut filter is a variable frequency type that inserts a 12
dB per octave rolloff at frequencies between 30 and 400 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 60 Hz, the last half
of the rotation affects frequencies between 70 and 400 Hz. This is
done so that there is plenty of control in the critical low frequency
range. 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 on/off switch to turn on the filter circuit. Start
with the frequency 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.
The phase reverse switch is used to reduce feedback and to control
phase interactions between the two channels. If you are using two
pickups or a mic and a pickup, you will find the phase reverse switch to
come in handy. Mic feedback can be reduced by reversing the phase
of the signal. Phase related interactions between a mic and a pickup
or two pickups can be cleared up by reversing the phase of one of the
channels. You should experiment with the phase reverse switch to see
if the effect is one that you like.
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 return input can also be used as an auxiliary input for connecting
other line level signals such as a CD player.
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