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Yes - the latest generation (first available in
2008) acoustic preamp from Schertler - the Pre-A 111 really is
loaded with goodies for the recording and amplified bassist. In
brief the compact device not only provides a +19dB preamplified
signal ("dry output") for connection to any power amp
or active speaker - it is musically and technically synchronized
to the Stat. Fine tuning equalisation ("main output")
has been pre-tuned to frequencies which Schertler deem the most
appropriate to the double bass and there are integrated Volume,
Resonance, Bass, Treble, and Gain controls to provide a wide selection
of tone and dynamic settings. If all that wasn’t enough the
Pre-A 111 accepts both XLR (Canon) and 6mm (1/4in) jack inputs
and has a regulated AC power supply. All this wizardry adds up
to an incredible amount of onstage flexibility and a top class
sound reproduction.
"The ACOUSTIC PREAMP PRE-A 111 is the result
of a new amplification concept by means of an innovative circuit
with class A design with NO NEGATIVE FEEDBACK!! The generated signal
reproduces an acoustic instrument's sound with incredible fidelity
and response.
The choice of high quality components and the external
(no battery) power supply provides solid circuit stability.
This preamplifier has been engineered and designed
especially to derive the best performance from SHERTLER transducers
and active loudspeakers. The sound quality of your amplified instrument
will improve using the PRE-A 111."
- GAIN; Allows adjustment to the sensitivity
of the balanced (XLR) and the unbalanced (jack) input.
- RESON; The Reson potentiometer allows adjustment
of the attenuation resonance filter (cut or notch) at 180Hz to
prevent feedback of the instrument. The filter has a medium Q
(range). Reson is inactive at full left and provides maximum
cut at full right.
- TREBLE; Allows the amplitude of high frequencies
to be increased or decreased.
- BASS; Allows the amplitude of low frequencies
to be increased or decreased.
- VOLUME; Final amplification stage after filter
and EQ adjustments for the OUTPUT (DRY OUT is influenced only
by the GAIN - house system signal).
- 12V DC Input; Socket for a regulated 12V direct
current supply.
- 10V DC Supply switch; Allows a DC supply voltage
of 12V (R-4,7kΩ) to the input jack connector. For the STAT
series microphones to work properly the 10V switch should be
On (out position).
- GROUND LIFT switch; Allows the ground on the Dry
Out to be disconnected in case of ground conflict.
- DRY OUT; The DRY-OUT is only gain-dependant and
sends the clean signal without passing through the EQ filters.
It is ideal for splitting the signal on stage and sending a dry
signal to the FOH mixer or a Multi-track recorder.
- OUTPUT; The OUTPUT gives you the signal after
the EQ filters and volume. It is ideal for your personal active
loudspeaker (monitor). When working with a bass amplifier the
Pre-A 111 should be plugged into the "effect return" input, "master-in" or "slave-in" of
the amplifier - to avoid the systems preamp. This will enable
you to manipulate an "electric sound" into one with
acoustic qualities.
- INPUT;
Yes - the Stat transducer has to be supplied with
10V phantom power to operate.
Condenser mics, also known as capacitor or electrostatic
microphones must have a source of direct electrical power in order
to operate. Some models are powered by an internal battery, but
most condenser microphones receive their power through the microphone
cable from the input of the device to which they are connected,
such as a mixer or microphone preamp. This method of sending a
DC electrical voltage through the microphone cables is called "phantom
power". In addition to powering the circuitry of the microphone
the phantom powering directly or indirectly supplies the voltage
used for polarizing (cause something to acquire polarity) the microphone's
transducer element ("capsule"). Phantom powering consists
of direct current applied equally through the two signal lines
of a balanced audio connector (usually an XLR connector). The supply
voltage is referenced to the ground pin of the connector (pin 1
of an XLR), which normally is connected to the cable shield or
a ground wire in the cable or both.
The Pre-A 111 measures 12.0 cm x 12.0 x 4.0cm (with
rubber feet) and is intended to be positioned as a floor unit.
The Pre-A 111 is powered by a regulated AC (Alternating current
i.e. "wall power") power supply. This along with the
class A (100% of the input signal is used. i.e. the active element
works in its linear range all of the time) constant current circuitry
ensures an optimum performance from the Stat.
The Pre A-111 is intended to be positioned as a
floor unit. Don't worry too much about it getting damaged by carless
stage hands - for the housing is made from cast aluminium and is
well up to the job of protecting the internal circuitry. For your
info the unit measures 12.0cm x 12.0cm x 3.5cm and weighs 400gms.
You'll just love the user friendly controls on the
front of the unit, the clear control and input labelling on the
top of the unit and the small but powerful blue LED light to the
front bottom left of the unit - that indicates that the unit is
receiving power. You'll also love the rugged good looks of the
cast aluminium housing and the small but chunky rubber feet that
the unit sits quietly upon.
Whatever pickup or transducer you are using The Shertler
PRE-A 111 is packed full of goodies and wizardry to optimise and
achieve a truly remarkable range of dynamic and tonal qualities.
In combination with the Shertler Stat, Dyn and Bluestick (undersaddle
electrostatic condenser microphone for guitar) range of transducers
and microphones the synchronized settings of PRE-A 111 allow the
recording and amplified musician to be in complete control of his
or her music making. With both XLR and 6mm inputs allowing total
equipment flexibility - this compact, robust, high-quality preamplifier
from Shertler is an absolute winner.
Pre-A 111
Dimensions: 120 x 120 x 35mm
Dimensions inc feet: 120 x 120 x 40mm
Weight: 0.40kg
Power Supply: 12V DC
Max input: -7 dBU (ideal for passive sources and mic signals)
Signal to noise ratio: 102dB
THD+N: 0.05% @ -20 dBu, 1KHz
Input impedance: 10 kΩ
0dBu < = > 0.775V
Pre-A 111 Main Output
Frequency response: 10 to 50 kHz
Max output: +15 dBu
Nominal output level: 0 dBu
Max gain: +41 dB
Output impedance: 10 Ω
0dBu < = > 0.775V
Pre-A 111 Dry Out
Frequency response: 14 to 50 kHz
Max output: +10 dBu
Nominal output: -12 dBu
Max gain: +19 dB
Output impedance: 100 Ω
0dBu < = > 0.775V
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