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ART hi-fi system Levelar

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Professional Vactrol Leveling Amplifier
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Compression is used to alter the dynamic range of a signal. In
recording and live sound situations, compression and limiting is
necessary to manage sounds with wide dynamic ranges. Dynamic
Range is measured as the difference between the loudest and soft-
est level of a signal. (i.e. from a scream to a whisper). Once a sig-
nal rises above or falls below the set threshold (selectable signal
level), the compressor automatically changes its gain to raise or
lower the overall signal level. Think of this as manually moving a
fader up and down to try to keep a signal at a consistent level.
Limiting can be described as a “ceiling”. When using a limiter,
once the signal level reaches the threshold, it is unable to go any
louder - it is limited to a desired level.
In addition to making signal levels more manageable, it is com-
mon practice to apply compression or limiting to a signal to make
it louder or more “in-your-face”. The benefit of using the Levelar
for these applications is in its design. By utilizing opto-electronics,
the Levelar allows you to add
more
compression without sound-
ing like you’re squashing the daylights out of the signal. Unlike
typical compressors that use VCA’s to control level detection, the
Levelar is very musical. The nature of its operation is much like
the way your eye adjusts to light. Just as your eye transparently
adjusts to changes in light, the Levelar adjusts to changes in signal
level.
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It’s easy to interface the Levelar with other equipment. All connec-
tions are made at the back of the Levelar. Standard XLR and 1/4”
inputs and outputs make patching simple. Note: For best audio
quality, always use high-quality cables.
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The Levelar provides both an XLR and 1/4” input jack. Both jacks
are balanced. The 1/4” jack can be used with unbalanced signals
by simply plugging in an unbalanced cable. The inputs are
designed for use with line level signals ranging from -30dBm to
+10dBm. While it is possible to plug an instrument directly into
the Levelar, it is desirable to run the instrument into a preamp
before the signal runs into the Levelar. This will provide a
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Thank you for purchasing the Levelar—and congratulations: You now own
one of the most sophisticated pieces of audio signal processing gear.
Similar in design philosophy to the classic tube limiters, the Levelar utilizes
a VCA-less design for premium, musical performance. This design features
electro-optical (Vactrol) and vacuum tube electronics which deliver classic
sound without the “old” noise.
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Single channel tube and Vactrol based Leveling Amplifier
Hand selected 12AX7 Tube
Vactrol - Optical electronic isolator
Non-VCA design = transparent, classic sound
Balanced XLR and 1/4” TRS inputs
Balanced XLR and 1/4” TRS outputs
Limiting and Compression ratios
Auto or Fast attack and release characteristics
Variable Threshold rotary control
Variable Output level rotary control
Gain reduction LED ladder
10Hz to 20kHz Frequency Response
>100dB Dynamic Range
Extremely low noise
Rugged, portable all steel chassis
Designed & Manufactured in the USA
Fill in the following information for your reference:
Date of purchase: _________________________________
Purchased from: _________________________________
Serial number: 129-______________________________
This is a great time to fill out the User Registration Card included with your
Levelar to become a completely informed A R T Artist. Returning the card
to us ensures you of becoming the first to know about new A R T prod-
ucts as well as any further developments from A R T.
129-5004-101
threshold (adding
more
compression to a signal). Turning this
control clockwise raises the threshold.
Setting the threshold control is dependent on the input signal.
The output from a guitar might be -20dB to -10dB, where the
level from an insert on a console might be -5dB to +10dB. The
easiest way to set the threshold control is to start with the control
fully clockwise. Slowly turn the control counter-clockwise (lower-
ing threshold) until you see the threshold LED light. Now adjust
the control (either lower or higher) until you have the amount of
compression you desire.
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The Active/ Bypass switch must be pressed “in” for the Levelar to
process a signal. In its “out” position, the Levelar is bypassed and
signal runs from the input jacks to the output jacks with no pro-
cessing. Use the Active/ Bypass switch when setting the Levelar’s
output level to achieve unity (no boost or cut) gain. Unity gain is
achieved when the active level is the same as the bypassed level.
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In its “out” position, the Levelar’s compression ratio is an active
2.3:1 ratio. This means that for every 2.3dB over the threshold the
input signal rises, the Levelar’s output will change by 1dB. This is
a very mild and musical compression ratio which is ideal for
smoothing all types of signals.
In its “in” position, the Levelar’s compression ratio is greater than
6:1. This is typically called “soft limiting” as it allows only a 1dB
change in signal level for any signal reaching over 6dB over the
set threshold. This setting is ideal for applications where exceed-
ing a set level is not desirable (mixing, popping bass, etc.).
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The position of the Auto/ Fast switch selects the release character-
istics of the Levelar. The “out” position allows the Levelar to
recover quickly once the signal falls below the threshold. The “in”
position allows the Levelar to adjust itself depending on the char-
acteristics of the input signal. Use the “fast” setting when the sig-
nal has repetitive, consistent characteristics (kick drum, snare,
vocals, etc.). Use the “auto” setting when the signal has varying
characteristics (long decaying notes alternating with quick notes,
5
stronger signal and will keep noise to a minimum. Microphones
must be run into a microphone preamplifier (like A R T’s Tube
MP) before being run into the Levelar. Use the XLR input for use
with equipment that provides an XLR output (like the Tube MP).
Use the 1/4” input jack for balanced or unbalanced 1/4” applica-
tions.
XLR pin configuration: pin 1 = ground, pin 2 = Positive (hot),
pin 3 = negative (cold). The 1/4” TRS configuration is: Tip =
Positive (hot), Ring = Negative (cold), Sleeve = Ground.
Do not use both inputs at the same time.
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The outputs of the Levelar are active balanced. You may use it in
an unbalanced configuration without harm to the output circuitry.
Use the unbalanced 1/4” jack for sending your signal to amps,
processors or other unbalanced configurations. Use the XLR out-
put to send signals to equipment which accepts XLR connections.
Both outputs may be used at the same time.
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Insert the supplied 9 Volt AC adapter’s plug into the input labeled
Pwr, 9VAC on the Levelar’s top panel.
The Levelar is powered by an external 9VAC adapter. Always make
sure the output plug is securely plugged into the rear of the
Levelar, and that the adapter is held firmly in an electrical outlet.
There is a “U” shaped knock-out above the power jack which is
designed to have the power cord looped into to prevent the cord
from coming unplugged. Never operate the Levelar or AC adapter
in the rain or in wet locations. If the AC adapter’s cord is ever cut,
discontinue use and replace the adapter with a new one. Unplug
the adapter when the Levelar is not in use. Refer to the label on
the adapter or the specifications later in this manual for the
appropriate operating voltages.
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The threshold control sets the point at which the Levelar will act
on a signal. Turning this control counter-clockwise lowers the
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Produktspecifikationer

Varumärke: ART
Kategori: hi-fi system
Modell: Levelar
Typ av operation: Knoppen
Färg på produkten: Grijs
Vikt: 5400 g
Bredd: 324 mm
Djup: 324 mm
Höjd: 1056 mm
Sladdlängd: 3 m
Snäll: Torenventilator
Användarmanual: Ja
Antal hastigheter: 4
Placering: Vloer
Justerbar i höjdled: Nee
Typ av strömkälla: AC
Strömförbrukning (typiskt): - W

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