Acoustic Image Flex - Manual (Page 4)

4
To turn on the Flex Cab, plug the detachable AC power cord into the
receptacle on the back of the amp and into a wall outlet. A power
switch next to the AC input turns on power illuminating a “power on”
indicator on the panel.
Note that a spare fuse is
mounted inside the drawer.
The Flex Cab operates with AC voltages between 100V and 240V,
50/60 Hz. An internal switch automatically selects the correct mode of
operation for the voltage range. No user action is required to set the
unit to operate with different AC voltages. Note that the correct AC
power cord must be used for connection to the appropriate wall plug. If
you do not have the right cord, you can buy one from an electronics or
computer store.
Note that when the power switch is off and the power indicator is off,
power is not completely removed from the amp. To completely remove
power, disconnect the power cord. Always leave the power cord
accessible so that you can easily disconnect power from the unit.
The RJ-45 jack located just below the AC inlet is the interface for the
Flex Pre. Both power for the preamp and signal connection from the
preamp to the Flex Cab are provided through this jack. When using
the Flex Pre, connect it to the jack using the supplied Cat5 cable
before turning on the Flex Cab. The maximum length of the Cat5 cable
is 100 feet. Turn the power off before disconnecting the cable.
Refer to the rear panel diagram. The inputs and controls for the Flex
Cab are located on the rear panel. The function of each is described
below. Refer to the signal flow diagram on page 3 for more detail.
There are two input jacks for the Flex Cab: an RJ-45 jack that provides
power to and receives signal from the Flex Pre and a 1/4 inch jack that
accepts an unbalanced input from most commercial preamps.
A 6.3-amp fast blow fuse is mounted in the
drawer marked with the fuse symbol that is part of the AC
receptacle. To replace the fuse, turn off the amp, remove the AC
cord and use a small screwdriver to pry the drawer out of the
receptacle. Remove and replace the fuse.
Note that there is a 5 to 10 second delay after the power has been
turned before the amp becomes operational. This is done so that
“start up” noises are not heard.
Inputs
Note
that when a signal is input to the 1/4 inch jack, the RJ-45 input is
disconnected.
The 1/4 inch input jack is only for instrument and line level
signals from a preamp or other source. Do
connect a speaker
output to this jack. The input circuit will be damaged.
Input and Control Panel
not
5
The thru jack on the panel is for connecting a second Flex Cab (or
other powered speaker cabinet). Use an instrument cable with 1/4
inch jacks to connect from the thru output to the input of the second
cabinet. Several units can be daisy chained in this way if desired.
There are four controls on the Flex Cab rear panel. The first is a master
level pot that controls the overall output level of the unit. Typically, this
control would be set at maximum (fully clockwise) when using the Flex
Pre as the input source. When using other preamps, the control may
have to be set at a different level to accommodate the signal level of a
particular preamp.
The downfiring (DF) woofer has two controls for affecting the low end
frequency response and the output level. The DF cutoff freq pot is a
sweepable, 12 dB per octave low cut filter that reduces the low
frequency output of the DF woofer in order to reduce the “boominess”
of the cabinet in those acoustic settings where there is too much bass.
Turn the control clockwise to reduce the output. When the control is
fully counterclockwise, the filter is set a 30 Hz, when it is fully
clockwise, it is set at 150 Hz.
The DF level control reduces the output of the DF woofer by 6 dB when
it is engaged. This control also will reduce boominess. The filter and
the level controls can be used independently or together. You should
experiment with these controls to hear how they affect the sound so
that you can best use them in playing situations. Note that these
controls are subtle in their effect in normal playing conditions, but their
effect is easily heard in difficult acoustic conditions and you will find
them to be useful when you need them.
The tweeter level control affects the output of the 2.5 inch tweeter.
When the control is set so the dot is straight up, the output is at the
same level as the other speakers giving the cabinet a balanced sound,
with a flat frequency response. If more treble is desired, turn the
control clockwise. Up to 6 dB of boost is available. If you want to
reduce the treble output, turn the control counterclockwise. Up to 10
dB of cut is available. You should experiment with this control so that
you can find the setting that sounds best to you.
There is a thermal overload indicator located above the power on
indicator. This indicator will be illuminated if the temperature of either
of the power amps inside the cabinet gets too hot. The amps will shut
off under this condition so if you loose output from the unit, check to
see if the thermal light is on. It’s very unlikely that you will ever
encounter this situation under normal playing conditions since the
amps have plenty of heat sinking to prevent thermal overload. Avoid
placing the cabinet in direct sunlight on a hot summer’s day since that
can add considerable heat inside the cabinet.
Controls