Wisdom SA-2 Manuale utente
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Owner’s Manual
SA-2
Two-Channel System Amplifier
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Table of Contents
Safety Instructions | 4
Unpacking | 5
Placement and Ventilation | 5
Operating Voltage | 6
Front and Rear Panels | 7
Care & Maintenance | 12
North American Warranty | 12
Obtaining Service | 13
Specifications | 14
Dimensions | 15
DOCUMENT CONVENTIONS
This document contains general safety, installation, and operation instructions for the Wisdom
Audio SA-2 Amplifier. It is important to read this document before attempting to use this
product. Pay particular attention to:
WARNING: Calls attention to a procedure, practice, condition or the like that, if not
correctly performed or adhered to, could result in injury or death.
CAUTION: Calls attention to a procedure, practice, condition or the like that, if not
correctly performed or adhered to, could result in damage to or destruction of part of or the
entire product.
Note: Calls attention to information that aids in the installation or operation of the product.
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WARNING: TO REDUCE THE RISK OF FIRE OR ELECTRIC SHOCK, DO NOT EXPOSE THIS
APPLIANCE TO RAIN OR MOISTURE.
CAUTION: TO REDUCE THE RISK OF ELECTRICAL SHOCK, DO NOT REMOVE COVER. NO
USER-SERVICEABLE PARTS INSIDE. REFER SERVICING TO QUALIFIED PERSONNEL.
DANGER:
The lightning flash with arrowhead symbol, within an equilateral triangle, is intended to alert the
user to the presence of un-insulated “dangerous voltage” within the product’s enclosure that may be
of sufficient magnitude to constitute a risk of electric shock to persons.
IMPORTANT
The exclamation point within an equilateral triangle is intended
to alert the user to the presence of important operating and maintenance (servicing) instructions in
the literature accompanying this equipment.
Marking by the “CE” symbol (shown left) indicates compliance of this device with the EMC
(Electromagnetic Compatibility) and LVD (Low Voltage Directive) standards of the European
Community.
Note: This equipment has been tested and found to comply with the limits for
a Class B digital device, pursuant to part 15 of the FCC Rules. These limits are designed to provide
reasonable protection against harmful interference in a residential installation. This equipment
generates, uses, and can radiate radio frequency energy and, if not installed and used in accordance
with the instructions, may cause harmful interference to radio communications. However, there is
no guarantee that interference will not occur in a particular installation. If this equipment does
cause harmful interference to radio or television reception, which can be determined by turning the
equipment off and on, the user is encouraged to try to correct the interference by one or more of the
following measures:
• Reorient or relocate the receiving antenna
• Increase the separation between the equipment and the receiver
• Connect the equipment into an outlet on a circuit different from that to which the receiver
is connected
• Consult the dealer or an experienced radio/TV technician for help
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Important Safety Instructions
Please read all instructions and precautions carefully and completely before
operating your Wisdom Audio equipment.
1. Read these instructions.
2. Keep these instructions.
3. Heed all warnings.
4. Follow all instructions.
5. Do not use this equipment near water.
6. Clean only with a dry cloth.
7. Do not block any ventilation openings. Install in accordance with the
manufacturer’s instructions.
8. Do not install near any heat sources such as radiators, heat registers, stoves, or
other apparatus (including amplifiers) that produce heat.
9. Do not defeat the safety purpose of the polarized or grounding-type plug. A
polarized plug has two blades with one wider than the other. A grounding type
plug has two blades and a third grounding prong. The wide blade of the third
prong is provided for your safety. If the provided plug does not fit into your
socket, consult an electrician for replacement of the obsolete outlet.
10. Protect the power cord from being walked on or pinched particularly at plugs,
convenience receptacles, and the point where they exit from the apparatus.
11. Only use attachments/accessories specified by the manufacturer.
12. Unplug this apparatus during lightning storms or when unused for long periods
of time.
13. Refer all servicing to qualified personnel. Servicing is required when the
apparatus has been damaged in any way, such as a power-supply cord or plug
is damaged, liquid has been spilled or objects have fallen into the apparatus,
the apparatus has been exposed to rain or moisture, does not operate normally,
or has been dropped.
14. ALWAYS disconnect your entire system from the AC mains before connecting
or disconnecting any cables, or when cleaning any component.
15. NEVER operate this product with any covers removed.
16. NEVER wet the inside of this product with any liquid.
17. NEVER pour or spill liquids directly on to this unit.
18. NEVER bypass any fuse.
19. NEVER replace any fuse with a value or type other than those specified.
20. NEVER operate this product in an explosive atmosphere.
21. ALWAYS keep electrical equipment out of the reach of children.
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Unpacking the SA-2
The Wisdom Audio SA-2 amplifier is a substantial piece of equipment. Please
exercise caution when unpacking your SA-2 to ensure that you do not strain
yourself from its (perhaps unexpected) weight.
CAUTION
Do not attempt to lift your SA-2 while bending or twisting from the waist. Use
your legs for lifting, not your back.
Always stand as straight as possible and keep the SA-2 close to your body to
reduce strain on your back.
After unpacking your SA-2, keep all packing materials for future transport. If you
need to ship your SA-2, only the original, purpose-designed shipping carton is
acceptable. Any other method of shipping this product runs a significant risk of
damage to the SA-2; damage that would not be covered by the warranty.
Carefully inspect your SA-2 for possible damage due to shipping. If you discover
any, contact your Wisdom Audio dealer immediately.
Placement Considerations
PRECAUTION
For your protection, review “Important Safety Instructions” and “Operating
Voltage” before you install your SA-2.
Note that adequate clearance for the AC cord and connecting signal cables must be
left behind your SA-2. We suggest leaving at least six inches (15 cm) of free space
behind your SA-2, so all cables have sufficient room to bend without crimping or
undue strain.
If possible, the SA-2 should also be placed in such a way that the power switch on
the rear panel is easily accessible. This switch disconnects power from the unit
completely, resulting in effective disconnection of the SA-2 from the AC mains.
You might think of this as a “vacation switch”, should you wish to turn off your
system completely when you will be away from home for a prolonged period. Just
remember to turn it back on again when you return.
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Ventilation
Your Wisdom Audio SA-2 has relatively modest ventilation requirements, thanks to
its remarkably efficient design. Typically, it becomes only modestly warm during
normal operation. Still, please be certain to keep the vents on the sides of the
amplifier clear of any obstruction. (The rack mount attachments have
corresponding vents.)
Mechanical drawings are included in this manual to facilitate special installations
where necessary (see “Dimensions” at the end of this manual).
Operating Voltage
For compatibility with existing household outlets, a standard three prong, 20-
ampere plug is provided on the removable, IEC-standard AC mains cable.
The Wisdom Audio SA-2 may be set for 100V, 120V, or 230V/240V AC mains
operation. Outside the United States, and depending on local electrical codes and
regulations, the AC mains cord may need to be replaced with one that con- forms
to local plug/outlet standards.
NOTE: The AC receptacle employs a 20-amp IEC-standard socket (not the more
common 15-amp IEC socket).
The operating voltage of the SA-2 may not be changed by the user. Your amplifier
has been preset at the factory for the voltage of the country for which it was built. If
you move to a country with a different AC mains voltage, please contact your local
Wisdom Audio distributor or Wisdom Audio for assistance.
CAUTION! Always make certain the SA-2 is set to the correct voltage before
connecting it to AC mains power! Failure to do so can severely damage the unit
and void the warranty.
This power amplifier has an extremely large power supply, and consequently
includes a special protection circuit that protects your AC mains circuit from
excessive in-rush currents when power is applied to the unit.
CAUTION! Please allow thirty seconds between turning the unit On and Off, or
toggling between Operate and Standby, to ensure that the in-rush protection circuit
has an opportunity to reset itself properly.
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Failure to observe this procedure may result in nuisance tripping of the AC mains
supply’s circuit breaker. If this should happen, disconnect the amplifier, reset the
AC mains supply’s circuit breaker, and wait for two minutes before re- connecting
the amplifier to the AC mains.
Front Panel
1. Power Switch and Indicator: The SA-2 features a sculpted front panel that
conceals a switch under the flexible left end of the middle section. Gently
pressing the left end of the center section will engage a micro switch under
the face of the SA-2, which will in turn toggle the unit between operate and
standby. The international symbol for power is inscribed in this location to
designate its purpose. There are three normal states for the lit indicators:
• Lit amber LED on left side indicates the unit is receiving power and is in
standby "
• Lit blue channel status indicators indicate the unit is receiving power and
is fully on "
• If both the amber and blue LEDs are off, no power is being supplied to
the amplifier "
2. Channel Status Indicators: These two LEDs provide visual confirmation of
the operational status of the two channels in your SA-2. Any fault condition
that causes an individual amplifier channel to shut down (for example, a
short-circuited speaker wire) will result in the LED indicator for that channel
blinking to notify you of a problem. If one or more indicators are blinking,
turn off the amplifier and completely disconnect the speaker wires for the
offending channel. (The LEDs are arranged on the front as the channels are
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arranged on the back, as seen from the front.) Turn the amplifier back on
and check the status indicator. If it is still blinking, there is likely an internal
problem within the SA-2. Please contact your local Wisdom Audio dealer or
Wisdom Audio’s Technical Service department for assistance. If removing
the speaker wires from the offending channel appears to solve the problem;
check the DC resistance across the speaker leads you disconnected. It
should read several ohms (the exact number varies a bit by model). If the
DC resistance is under 1Ω, carefully check all the connections to make sure
no speaker wires are touching each other or shorted out in case their
insulation has been damaged. If yours is a custom installation with wires
that are run in the walls, you should probably call your Wisdom Audio
dealer for assistance trouble-shooting the installation.
Rear Panel
CAUTION! Turn off the SA-2 before attempting to make or change any connections.
1. Balanced Audio Inputs
The pin assignments of this XLR-type
female input connector are:
Pin 1: Chassis ground"1
Pin 2: Signal + (non-inverting)
Pin 3: Signal – (inverting)
Connector ground lug: chassis ground
These pin assignments are consistent with the standards adopted by the Audio
Engineering Society
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2. Speaker Output Terminals
The Wisdom Audio SA-series amplifiers are equipped with high-current
binding posts for output termination to the loudspeaker system. To take full
advantage of the amplifier’s sonic quality, we recommend using high-
quality speaker cable; please see your Wisdom Audio dealer.
CAUTION!
Never connect a power amplifier’s output terminals to any device other
than a loudspeaker.
"
Never short-circuit the amplifier’s output terminals.
"
Never connect the output terminals of one amplifier to the output
terminals of another amplifier.
Each channel of the SA-2 system amplifier has a single, patented Cardas
speaker terminal for making the speaker wire connections. This system uses
a single large knob to tighten down on both positive + and negative –
connections at once, without any need for tools.
The unique design of these binding posts allows the use of a strong, hard
material for the threads that provide the pressure on the connection, while at
the same time using optimal electrical connections (which require a softer
metal). By separating the mechanical and the electrical systems within the
connector, both can be properly optimized.
Ring terminal connectors are included with every SA amplifier for proper
hook-up of speaker cables to your amplifiers Cardas terminals.
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Connect the + (positive) output post of the amplifier to the + (positive) input
terminal of the appropriate loudspeaker. Connect a – (negative or black)
output post of the amplifier to the – (negative or black) input terminal of the
appropriate loudspeaker. Take care to maintain this proper polarity
throughout the system.
3. DC Trigger In and Out
These 12v trigger jacks provide compatibility with a wide range of products
to facilitate remote turn-on and turn-off in systems. These 1/8” (3.5 mm)
“mini-jacks” allow other components to bring the SA-2 in and out of
standby. Two such mini-jacks are provided to allow “daisy-chaining” of this
turn-on signal with other components, including additional amplifiers.
The remote trigger input will be operated by any positive-polarity DC signal
between 3–20 volts (only a few milliamps are required), with tip polarity as
shown below
The DC Trigger Input has priority over the front panel switch. Therefore, if a
trigger voltage is present at this input connector, the unit will be forced on
and the front panel switch will be ignored. When the voltage transitions
from high to low (off), the unit will go into standby.
When there is no voltage present at the trigger input (either because the
controlling device is not sending, or because the plug is removed), the front
panel switch will operate the SA-2, as you would expect.
The 12v Trigger Output jack is driven to a “high” state of 12 volts a few
seconds after the SA-2 is turned on and can source as much as 100 mA of
current at 12 volts. This signal may be used in turn to control other
components, such as additional Wisdom Audio SA-series amplifiers. Each
Wisdom Audio component has a short delay built into its DC trigger system
to facilitate a staggered turn-on sequence.
Your Wisdom Audio dealer can help you take advantage of these design
features to maximize your system’s convenience and versatility.
4. AC Mains Input & Switch
Input Signal: 3-20 volts @ less than 10 mA
Output Signal: 12 volts @ 100mA
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