Sherbourn PA 2-250 Manuale utente
Important Safety Precautions and Explanation of Symbols
The exclamation point within an equilateral triangle is intended to alert the user to the presence of
important installation, operation, and service instructions in this manual.
The lightning ash with arrowhead symbol within an equilateral triangle is intended to alert the user
to the presence of uninsulated dangerous voltages within the enclosure that may be of sufcient
magnitude to constitute the risk of electrical shock to the user.
Please read this Installation and Operation Manual thoroughly before attempting to install, congure,
or operate the PA 2-250. After successful installation and conguration of the PA 2-250, be sure to
retain this manual in a safe place for future reference.
Safety is a key component to a long lasting and trouble free installation. Please read and follow all
instructions and heed all warnings on the PA 2-250 and in this manual. If you are not comfortable with
the installation of audio/video entertainment equipment, you should seek the services of a qualied
installation professional or call us for help.
WARNING: TO REDUCE THE RISK OF FIRE OR ELECTRIC SHOCK, DO NOT USE THE
PA 2-250 NEAR WATER OR IN WET LOCATIONS, DO NOT EXPOSE IT TO RAIN OR MOISTURE,
DO NOT EXPOSE IT TO DRIPPING OR SPLASHING FROM OTHER SOURCES, AND ENSURE
THAT NO OBJECTS FILLED WITH LIQUIDS ARE PLACED ON IT. DOING SO MAY RESULT IN
DAMAGE TO THE PA 2-250 AND THE RISK OF ELECTRIC SHOCK, WHICH MAY RESULT IN
BODILY INJURY OR DEATH.
WARNING: TO REDUCE THE RISK OF ELECTRIC SHOCK, DO NOT REMOVE THE COVER
FROM THE PA 2-250. THERE ARE NO USER-SERVICEABLE PARTS INSIDE THE PA 2-250.
REFER ALL SERVICE TO QUALIFIED SERVICE PERSONNEL.
WARNING: DANGEROUS VOLTAGES MAY BE PRESENT AT THE SPEAKER OUTPUT
TERMINALS OF HIGH POWERED AMPLIFIERS. TO REDUCE THE RISK OF ELECTRIC SHOCK,
DO NOT TOUCH UNINSULATED AREAS OF TERMINALS OR SPEAKER WIRES, UNLESS THE
AMPLIFIER IS TURNED OFF.
To reduce the risk of electrical damage, verify that no short circuits are present between terminals and
/or speaker wires before applying power.
Do not install the PA 2-250 near or above any heat sources such as radiators, heating vents, or other
apparatus that produce heat. Do not block any ventilation openings or heat sinks. Avoid installing the
PA 2-250 directly above other heat-producing equipment unless sufcient ventilation or forced-air
cooling is provided.
Do not install the PA 2-250 in locations without proper ventilation. The PA 2-250 should not be
operated on a bed, sofa, rug, or similar surface that may block vents. The PA 2-250 should not be
installed in an enclosed location such as a bookcase, cabinet, or closed equipment rack, unless
sufcient forced-air ventilation is provided.
Always install your PA 2-250 according to the manufacturer’s instructions and only use attachments or
accessories specied by the manufacturer.
Do not install the PA 2-250 on any stand, shelf, or other piece of furniture that is unable to support its
weight.
Connect the PA 2-250 only to power sources of the correct voltage as shown in this manual and on
the PA 2-250. Ensure that the Input Voltage selector switch on the rear of the PA 2-250 is set to the
appropriate voltage.
!
!
Protect power supply cables from being pinched, walked on, or otherwise damaged. Be especially
careful where the power cable enters the power outlet and the PA 2-250 unit.
Only connect the PA 2-250 to an electrical outlet or extension cord of appropriate type and rating.
DO NOT defeat the safety purpose of a grounding or polarized plug by removing ground pins or using
unsafe adapters. A polarized plug has two blades - one wider than the other. A grounding plug has a
third ground prong in addition to the two main conductors. The wide blade, or third groundling prong,
is provided for your safety. If the provided plug does not t your outlet, consult an electrician to replace
your outlet. If you replace the PA 2-250 power cord, only use one of similar type and of equal or
greater current rating.
The power cable for the PA 2-250 should be unplugged from the outlet during severe electrical storms
or when unused for a long period of time.
Only replace any fuses in the PA 2-250 with fuses of proper value, type, and voltage rating.
The PA 2-250 should only be cleaned as directed in the Installation and Operation Manual. Avoid
spraying liquids directly onto the PA 2-250 and never spray liquids into the vents. Care should be
taken so that small objects do not fall inside of the PA 2-250.
You should seek service for your PA 2-250 from qualied service personnel if any of the following
occur:
1. The power-supply cord or the plug has been damaged.
2. Objects or liquid have fallen or spilled into the vents.
3. The PA 2-250 has been exposed to rain.
4. The PA 2-250 exhibits a marked change in performance.
5. The PA 2-250 has been dropped or its enclosure or chassis is damaged.
NOTE: TO COMPLETELY DISCONNECT THE PA 2-250 FROM THE AC POWER MAINS,
DISCONNECT THE AC POWER CORD FROM THE AC RECEPTACLE.
NOTE: THE AC POWER CORD ON THE PA 2-250 MUST REMAIN READILY ACCESSIBLE AT ALL
TIMES.
!
CAUTION
CAUTION: TO REDUCE THE RISK
OF ELECTRICAL SHOCK, DO
NOT REMOVE COVER. NO USER
SERVICEABLE PARTS INSIDE.
REFER SERVICING TO QUALIFIED
SERVICE PERSONNEL.
FCC Interference Statement
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. 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 using one or more of the following measures:
1. Reorient or relocate the receiving antenna.
2. Increase the separation distance between the equipment and receiver.
3. Connect the equipment into an outlet on a circuit different from that of the receiver.
4. Consult the dealer or an experienced radio/TV technician for help.
For questions regarding service, please contact:
Sherbourn Technologies, Inc.
131 SE Parkway Court
Franklin, Tennessee
37064
Tel: (615) 791-4046
Fax: (615) 791-6287
Web: www.sherbourn.com
Contents
Important safety precautions and explanation of symbols
Introduction.................................................................................................2
The PA 2-250..............................................................................................2
About this manual.......................................................................................2
Mechanical and environmental...................................................................3
Inputs and outputs......................................................................................4
Installation tips............................................................................................5
Conguration ..............................................................................................6
Performance specications ........................................................................7
Features .....................................................................................................8
Operation....................................................................................................9
Periodic maintenance...............................................................................10
Troubleshooting........................................................................................11
10-year Limited Warranty .........................................................................12
Notes ........................................................................................................13
PA 2-250
STEREO POWER AMPLIFIER
Page 2
Introduction
Thank you for choosing the PA 2-250 Stereo Power Amplier.
The PA 2-250 combines the superb sound quality and virtually endless power reserves necessary
to satisfy a discerning audiophile. It posesses with the exibility and reliability demanded by both
customers and professional installers.
Design features like proven class A/B technology, Sherbourn’s intelligent protection system, and true
commercial grade construction quality and reliability make the PA 2-250 an ideal choice wherever
two high-powered channels of excellent sounding audio amplication are needed.
The Sherbourn Team
About This Manual
This manual will provide you with all the information you need to install and congure the PA
2-250 Stereo Power Amplier to achieve its optimum potential. This manual also includes a brief
summary of the features offered by the PA 2-250, a short description of how the controls work, and
instructions on how to perform common operations.
You may wish to record serial numbers or other purchase information on the Notes page at the back
of this manual.
The PA 2-250
The PA 2-250 delivers 300 watts/channel into 8 ohms and over 500 watts/channel into 4 ohms
with very low noise and vanishingly low distortion, and is ruler at over the audio band. A massive
toroidal power supply and discrete fully symmetrical circuit design enable the PA 2-250 to run even
difcult loads with ease and gives it the ability to reproduce music with the full dynamic range it
needs to sound its best. The PA 2-250, simply put, is a clean, powerful, truly outstanding power
amp.
The PA 2-250 is also quite exible and includes both balanced (XLR) and unbalanced (RCA) inputs,
a Trigger Input, a Trigger Output, a rear panel switch to disable the Status LEDs, full-sized ve way
binding posts for speaker connection, and audiophile grade RCA input connectors. The PA 2-250 is
rack mountable and can run from either 115 VAC or 230 VAC via a convenient removable IEC power
cord. And, of course, you’re protected by the Sherbourn 5-year warranty.
Page 3
Mechanical and Environmental
Dimensions: 17” wide x 6” high x 19” deep (includes feet, binding posts, no rack ears)
(boxed: 22” x 24” x 11” high)
Weight: 48 lbs/22 kg (unboxed); 59.5 lbs/27 kg (boxed)
Rack mountable: Optional rack mount brackets.
Power requirements:
115 VAC or 230 VAC +/- 10% @ 50 / 60 Hz (selectable by rear-panel switch)
Power consumption: 650 watts, under maximum load.
Ventilation and cooling:
To avoid overheating, be sure to provide adequate clearance and ventilation, both above and below.
17”
19”
19”
18”
5.125”
TOP
FRONT
SIDE
1/16”
6”
RACK HANDLES
SHERBOURN PA 2-250
PA 2-250
Page 4
Inputs and Outputs
Analog inputs:
Each channel has independent, switch selectable balanced (XLR) and unbalanced (RCA) inputs.
Unbalanced inputs are audiophile grade, machined, gold-plated connectors.
Input sensitivity (for full output):
1.7 V (8 ohms); 1.5 V (4 ohms)
Speaker outputs:
5-way binding posts, gold plated
Minimum recommended load impedance:
4 ohms (one 4 ohm load or two paralleled 8 ohm loads per channel)
Trigger and control:
Trigger Input (mono 1/8”), Trigger Output (mono 1/8”)
Front panel controls and indicators:
On / Off (large push button); toggles Standby mode
On / Off LED (1); red indicates Standby mode; blue indicates normal operation;
ashing red indicates a fault (Protect)
Channel Status LEDs (2); blue indicates normal operation; ashing red indicates a fault
(may be disabled by rear panel Status LED switch)
Rear panel controls and indicators:
Power (rocker switch); switches mains power
Input Voltage (protected slide switch); selects 115 or 230 VAC line voltage
Status LED switch (disables front panel Status LEDs and dims On/Off LED)
Input switch (one per channel); selects balanced (XLR) or unbalanced (RCA) input
AC power input:
IEC C17/C18 type inlet and power cord
Page 5
Installation Tips
Inputs and outputs
Balanced (XLR) audio interconnects will provide better noise immunity, and are best suited to long
cable runs or noisy environments. Be sure to select the correct input for each channel using the
appropriate rear panel switches.
Rack mounting
The PA 2-250 is quite heavy. Locate the PA 2-250 on racks, stands, or shelves rated to support at
least 100 pounds. We recommend using the (optional) Sherbourn rack mount adapters.
Ventilation and cooling
Even though the PA 2-250 is very efcient, it can produce signicant heat; to avoid overheating, be
sure to provide adequate clearance and ventilation. Overheating adversely affects performance and
shortens component life. We suggest locating components that produce the most heat towards the
top of your rack, if practical, and leaving at least 1U (1.75”) of rack space between components.
Space between components can be left open for ventilation, lled with a spacer, or used to house a
forced-air cooling solution.
Sherbourn’s C-12 Flex Rack™ Cooling System uses whisper quiet, high capacity, variable speed
fans to provide over 100 CFM of forced air cooling for rack installations. The C-12 offers a variety of
air-ow options (including external ducting), includes professional features like triggered operation
and thermostatic control, and takes up only 2U of rack space.
AC power source
The PA 2-250 uses an IEC C17/C18 type power cord and requires an appropriate
matching AC outlet.
Connections
Ensure that the amplier is powered Off when connecting and disconnecting speakers.
Ensure that speaker cables are not shorted to each other or to adjacent wiring before powering the
PA 2-250 on.
Triggers
When the PA 2-250 is in Standby mode (On/Off LED is lit red), asserting a trigger signal turns the
PA 2-250 on, and it remains on until the trigger is no longer asserted. If the trigger signal is already
active when mains power is applied, the PA 2-250 will switch on as soon as it completes self-test,
and will switch to Standby when the trigger is no longer asserted.
If the front panel On/Off switch is pressed while the PA 2-250 is on (after being switched on by an
asserted trigger), the On/Off switch will override the trigger and the PA 2-250 will return to Standby
position (even though the trigger is still being asserted). Pressing the front panel On/Off button,
dropping and re-asserting the trigger, or switching the mains power off and on again while the trigger
remains asserted, will then switch the PA 2-250 back to on.
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