Peavey V4X - Page 2

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FRONT
PANEL
System Gain (A)
Used
to
optimize
the
interface
gain
between
the
V4X™
and
the
associated
mixer.
Control
range
is
-10
dB
to
+10
dB
with
a
detent in the "0" position.
Operation
note
The
0
dB
setting
should
be
considered
normal
for
many
applications,
however
adjustments
in
the
-
(negative)
positions
will
reduce
system
noise.
Settings
in
the
*
(positive)
positions
will
improve
headroom
with
mixers
having
output
capability
less
than
+24 dBV, at the expense of added system noise.
Applications
requiring
low
system
noise
such
as
studios,
churches,
etc.
and
where
headroom
is
not
critical,
the
noise
level
can
be improved
by operating
the VAX system gain at levels below 0 dB. Example:
A setting of -6 dB will reduce system noise by 6 dB.
At the same time, system headroom
will have been reduced by 6 dB. Such “compromises”
should be considered
normal in noise
sensitive applications.
System
headroom
can
be
substantially
increased
with
the
V4X
in
applications
where
the
mixer
output
is
less
than
+24
dBV.
To
accomplish
this,
the
optimum
adjustment
of
the
System
Gain
will
usually
be
the
difference
between
the
V4X
output
rating
(+24
dBV)
and
the
mixer
output
rating.
Example:
If
the
mixer
output
rating
is
+18
dBV,
the
VAX
System
Gain
should
be
set
at
«6dB
(24
-18
=+6
dB).
If
the
mixer
output
rating
is
+24
dBV,
the
correct
setting
would
be
0
dB.
For
mixers
with
output
capability
at*24
dBV
or higher, System Gain settings above 0 dB will not improve headroom
but will increase system noise.
Crossover Frequency Controls (B, C, D)
The
VAX's
four
outputs
are
derived
from
three,
third-order,
state
variable
filters
(18
dB
per
octave
roll-off).
Each
filter
is
independent,
with
the
-3
dB
crossover
frequency
selected
via
a
screwdriver
control.
The
screwdriver
adjustment
is
utilized
to
prevent accidental
changing
of the critical crossover
frequency
values.
Low-To-Mid (B)
Control
range
is
from
20
Hz
to
400
Hz
and
determines
the
-3
dB
crossover
point
between
the
Low
and
Mid
frequency
bandpasses.
Mid-To-High
(C)
Control
range
is
from
200
Hz
to
4
kHz
and
determines
the
-3
dB
crossover
point
between
the
Mid
and
High
frequency
bandpasses.
High-To-Very
High (D)
Control
range
is
from
1
kHz
to
20
kHz and
determines
the
-3
dB
crossover
point
between
the
High
and
Very High
bandpasses.
Bandpass
Level Controls (E,F,G,H)
Each bandpass section features a level control to compensate for the various loudspeaker efficiency ratings. All have range
from
off
(-
infinity)
to
+6
dB
and
each
have
a
detent
at
the
0
dB
(12:00)
position
which
is
the
“unity
gain”
setting.
Each
is
precisely
calibrated to allow compensation for variations in loudspeaker efficiency ratings. (See Set Up Procedure Section.)
Operation Note
Normally
the
High
Frequency
bandpass
is
used
for
the
horn/driver
partion
of
a
multi-way
system
since
this
bandpass
has
the
unique
equalization
capability.
Horn/driver
combinations
usually
require
some
“padding”
(negative
dB
setting)
due
to
their
higher
efficiency
ratings.
Therefore,
a
good
"starting"
setting
is-6
dB
for
the
High
Frequency
level.
For
further
explanation,
see
“High Frequency
Equalization”
High Frequency Equalization ("HF EQ") (I)
High
frequency
EQ
(high
end
boost)
is
used
in
two-way
systems
utilizing
horn
drivers
to
extend
the
usable
frequency
range
by
one
octave
or
more.
The
VAX
equalization
frequency
is
factory
preset
and
optimized
for
Peavey
horn
drivers
and
loudspeakers.
The high frequency
boost is automatically
determined
by the setting of the High Frequency
Level control (G). When itis set at O
dB
or
at
any
+
dB
setting,
there
is
little
or
no
high
frequency
boost added
by
engaging
the
HF
EQ
function.
At
-
dB
settings,
the
amount
of
boost
added
by
the
HF
EQ
function
is
approximately
equal
to
the
amount
of
pad.
40 Hz Rolloff (J)
Provides
a
24
dB
per
octave
roll
off
at
40
Hz
to
reduce
subsonic
rumble
and
to
protect
the
low
speaker
from
operating
below
its
cutoff
frequency.
Affects
only
the
Low
Frequency
bandpass.
When
not
engaged,
the
low
end
rolloff
is
below
10
Hz
20 kHz Rolloff (К)
Provides
an
18
dB
per
octave
rolloff
at
20
kHz
to
protect
horns
and
tweeters
from
supersonic
signals
which
could
be
damaging
Affects
only
the
Very
High
Frequency
bandpass.
When
not
engaged,
the
high
end
rolloff
is
above
50
kHz.
Power Switch (L)
Depress the switch to the "On" position. The red pilot light (LED) will illuminate indicating power is being supplied to the unit.
Operation Note
‘Always check for proper system connections before applying power. Upon initial hook-up, set all the bandpass level controls
to
the
off
position
(infinity)
before
applying
power;
then
slowly
bring
up
the
various
levels
to
verify
proper
bandpass
connec-
tions. A misconnected system could destroy loudspeakers.