53 Briarwood Road • Florham Park, New Jersey • 07932 • [email protected]
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Dual-Mono Balanced Operation
Two standard Cantatas may be operated, without
modification, as balanced monoblocks to obtain two
monophonic amplifiers of 300 watts/8 ohms each.
Each monophonic balanced Cantata (one per channel)
must be driven by a preamplifier with balanced outputs,
or by our Duette™ Balancing Module. If you connect
your Cantata as a balanced monoblock, be sure to
connect the speaker across the two red ("hot") binding
posts. Ground is not used to carry signal in a balanced
configuration. Your authorized Sonogy dealer can
explain fully how to connect a balanced preamplifier to
a pair of Cantata monoblocks.
Balanced operation offers many sonic and technical
advantages. Most obviously, this guarantees the power
to reproduce high volume and explosive dynamics with
a greater sense of realism. Many subtle advantages are
offered as well. True dual mono operation enhances
the three dimensional stereo image. Furthermore,
balanced operation has technical advantages, derived
from distributing the speaker's load evenly within the
amplifier, which result in better fidelity, depth of
image, smoothness, and realism, even at lower levels
which might not appear to need the awesome power of
two 300 watt monoblock amplifiers.
Warm-Up
Contrary
to
popular
belief,
even
solid-state
(transistorized) equipment benefits from a warm-up
period. While your Cantata will operate properly and
safely as soon as it is turned on, most listeners find that
the sound improves substantially during 20-30 minutes
of use, and continues to improve over the next hours of
continual operation.
Standby Mode
The class-A circuit cards are not switched on and off.
Once your Cantata is plugged in, these circuits
continuously operate in standby mode. The Cantata
will not perform optimally until these circuits have
warmed up for at least 24 hours with the Cantata
plugged into a live AC outlet.
First Turn-On
When the Canttata is first plugged in (or subsequently
plugged in after moving), always be sure that the power
switch is off, and wait 2 minutes for the bias circuits to
stabilize. This will avoid an unusual turn-on surge.
Ventilation and Heat
Your Cantata is expected to run warm, but not hot.
Since the Cantata relies on convection cooling, it is
important to allow space around the amplifier and
particularly important not to obstruct the cooling fins.
Do not stack a preamplifier or any other equipment
directly above the Cantata. Leave at least 2 inches of
space on all sides, as well as a dissipation path for
warm air. If possible, raise the amplifier off any rugs
by 1-3" to improve airflow and cooling.
Never operate
the Cantata in such a way that its heat-sinks become
hot to the touch.
On/Off Switch & Soft Start Circuitry
The On/Off switch controls only the high-current
output stages. The circuit cards are in standby mode
whenever your Cantata is plugged in.
Soft start circuitry turns on the high current output
stage slowly, in order to minimize the inrush to charge
nearly 100,000 uF of energy storage. After 1 second,
this soft start circuitry is completely by-passed by a
high quality relay. None of this circuitry is in the audio
path.
Output Current Capability:
The Cantata is a very high current design, capable of
driving low impedance and reactive loads while
maintaining sonic purity. Each channel's output stage
can deliver peak current of 30 amperes (<100mS), and
the power supply is capable of delivering a total of
600W continuously. This translates to over 10A per
channel at rated voltage output.
D.C. Offset Compensation Circuitry
Your Cantata is equipped with circuitry which monitors
the presence of DC voltage at the output, and through a
servo arrangement constantly adjusts amplifier
operation for zero DC at the speaker terminals. If you
notice any unusual operation, or measure more than
100mV of DC at the outputs, turn your Cantata off
immediately and contact your dealer for service.
Power Requirements
The Cantata must be plugged into a 110/120 volt (AC)
outlet. While on, the amplifier may be expected to draw
100 watts at all times, and up to 700 watts
momentarily. The amplifier should be plugged directly
into a wall outlet rated for at least 10A, or into a heavy-
duty extension cord. If you have an unusual
requirement, contact your dealer or a qualified
electrician.
