Sherbourn PA 7-350 User manual
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 a risk of electrical shock to the user.
Please read this Installation and Operation Manual thoroughly before attempting to install,
congure, or operate the PA 7-350. After successful installation and conguration of the
PA 7-350, 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 7-350 and in this manual. The
vast majority of the subsequent safety precautions are common sense. 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 prevent the risk of re or electric shock, do not use the PA 7-350 near
water or in wet locations and do not expose it to rain or moisture. Doing so may
result in damage to the PA 7-350 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 7-350. There are no user-serviceable parts inside the PA 7-350. Refer all service
to qualied service personnel.
WARNING: Dangerous voltages may be present at the speaker output terminals
of high powered ampliers. To reduce the risk of electric shock, do not touch
uninsulated areas of terminals or speaker wires unless the amplier 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 7-350 near any heat sources such as radiators or heating vents. Avoid
installing the PA 7-350 directly above other heat-producing equipment unless sufcient
ventilation or forced-air cooling is provided.
Do not install the PA 7-350 in locations without proper ventilation. The PA 7-350 should
not be operated on a bed, sofa, rug, or similar surface that may block vents. The PA 7-350
should not be installed in an enclosed location such as a bookcase, cabinet, or closed
equipment rack unless sufcient forced-air ventilation is provided.
Connect the PA 7-350 only to power sources of the correct voltage (as shown in this
manual and on the PA 7-350). Ensure that the Input Voltage selector switch on the rear of
the PA 7-350 is set to the appropriate voltage.
Protect power supply cables from being pinched, walked on, or otherwise damaged.
Only connect the PA 7-350 to an electrical outlet or extension cord of appropriate type
and rating. DO NOT defeat the safety purpose of a grounding or three-pronged plug by
removing ground pins or using unsafe adapters. If you replace the PA 7-350 power cord,
only use one of similar type and equal or greater current rating.
!
!
The power cable for the PA 7-350 should be unplugged from the outlet during severe
electrical storms, or when unused for a long period of time.
Only replace the fuse in the PA 7-350 with a fuse of proper value and voltage rating.
WARNING: Under some operating conditions, the PA 7-350 may cause a fuse or
circuit breaker in your breaker panel to open, which indicates that the PA 7-350 is
attempting to draw more current than your circuit can safely supply. If this occurs,
DO NOT replace the breaker or fuse with one of higher rating. Doing so may result in
the possibility of re or electric shock, which may result in serious injury or death.
The PA 7-350 should only be cleaned as directed in the Installation and Operation Manual.
Avoid spraying liquids directly onto the PA 7-350 and NEVER spray liquids into the vents.
Care should be taken so that small objects do not fall into the inside of the PA 7-350.
You should seek service for your PA 7-350 by 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 7-350 has been exposed to rain
4. The PA 7-350 exhibits a marked change in performance
5. The PA 7-350 has been dropped, or its enclosure or chassis is damaged.
WARNING: The PA 7-350 is VERY HEAVY. The PA 7-350 should be lifted by two
people, or by one person with mechanical assistance. The PA 7-350 should only be
placed on tables, stands, shelves, or mounted in racks with a load capacity of AT
LEAST 150 pounds.
!
!
!
Page 1
Contents
Important Safety Precautions and Explanation of Symbols
Introduction.................................................................................................2
The PA 7-350..............................................................................................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
Sherbourn Technologies, LLC Ten-Year Limited Warranty.......................12
Notes ........................................................................................................13
PA 7-350
Seven-Channel Power Amplier
Page 2
Introduction
Thank you for choosing the PA 7-350 Seven-Channel Power Amplier.
The PA 7-350 combines the superb sound quality necessary to satisfy the most discerning
audiophile with a virtually limitless store of power and the exibility and reliability demanded by
professional installers. Thanks to Sherbourn’s Soft Switch™ Class H technology, the PA 7-350 is
very efcient, which minimizes both power requirements and waste heat. The result is a power
amp that is easy to install and congure, sounds great, and will continue to deliver trouble-free
performance for many years to come.
Sincerely,
The Sherbourn Team
About This Manual
This manual will provide you with all the information you need to install and congure the PA 7-350
Seven-Channel Power Amplier to achieve its optimum potential. The manual also includes a brief
summary of the features offered by the PA 7-350 and a short description of how the controls work
and 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 7-350
The PA 7-350 is a seven-channel power amplier that can deliver all the clean power you need for
a truly stunning home theater experience. It is very conservatively rated to deliver 350 watts into 8
ohms and 550 watts into 4 ohms per channel, and has the massive power reserves necessary to
ensure that the most extreme musical dynamics are delivered cleanly and with no hint of strain or
distortion.
Each channel in the PA 7-350 has independently selectable balanced (XLR) and unbalanced (RCA)
inputs, a front panel status indicator, and two speaker outputs - to accommodate bi-wiring (via sets
of high-quality gold-plated and clear acrylic ve-way binding posts). The PA 7-350 also includes a
trigger input and output and is rack mountable.
The PA 7-350, with its huge 3.3 kVA toroidal power supply and highly-efcient Soft Switch™ Class H
design, delivers massive amounts of clean, dynamic, uncolored, audiophile-quality power, and does
so silently - with no need for noisy cooling fans. Even the front panel status display can be switched
off for true “stealth” operation.
Page 3
Mechanical and Environmental
17”
19”
20.5”
18”
19”
8.75”
TOP
FRONT
SIDE
5/16”
9.5”
RACK HANDLE / BRACKETS
SHERBOURN PA 7-350
Dimensions: 17” wide x 9.5” high x 19” deep (includes feet, binding posts, no rack ears)
Weight: 98.8 lbs / 44.8 kg (unboxed); 112.3 lbs / 51 kg (boxed)
Rack mountable: Yes, with optional Rack Handles / Brackets
Power requirements:
115 VAC or 230 VAC +/- 10% @ 50 / 60 Hz (selectable by rear-panel switch)
Power consumption: up to 4000 watts under maximum load
Note: We STRONGLY recommend that the PA 7-350 be attached to a dedicated power
circuit. Under real-world conditions, with typical loads, playing music, the
PA 7-350 will deliver full dynamic power when attached to a single dedicated
115 VAC 20 A circuit! If the PA 7-350 is to be used for demanding commercial
applications or under laboratory conditions, a dedicated 230 VAC 30 A circuit
is REQUIRED. Please contact Sherbourn Technical Support if you require more
information.
Ventilation and cooling:
Even though the PA 7-350 is very efcient, it still produces heat; to avoid overheating, be sure to
provide adequate clearance and ventilation. Never remove the feet of the amplier or block the
ventelation openings! Allow at least 1.75” above the unit for proper cooling!
Page 4
Inputs and Outputs
Analog inputs (each channel):
Independent balanced (XLR) and unbalanced (RCA) input; switch selectable
Input sensitivity (for full output into 8 ohms):
1 V
Speaker outputs (each channel):
5-way binding posts (gold-plated with clear acrylic); two sets per channel to facilitate bi-wiring
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:
Power / Standby (large push button); toggles standby mode
Power / Standby LED (1); RED indicates Standby mode, BLUE indicates Power On (Operate)
Channel Status LEDs (7); status LEDs ash RED at startup, light solid BLUE in operation;
on fault condition, faulted channel LED will ash RED, others will extinguish
(and unit will shut down)
Rear panel controls and indicators:
Power (rocker switch); switches mains power
Line Voltage (protected slide switch); selects 115 or 230 VAC line voltage
Channel Status indicator On / Off (turns off front panel status indicators)
Input Selector (7); independently selects balanced (XLR) or unbalanced (RCA)
input for each channel
AC power input:
IEC C19/C20 (20 A) type inlet and power cord
Note: Potentially lethal voltages are present inside this unit and at the speaker
terminals during operation. There are NO user serviceable fuses inside the PA 7-350.
The PA 7-350 cover should ONLY be opened by qualied service personnel.
Page 5
Installation Tips
Inputs and outputs
Balanced (XLR) audio interconnects usually provide better noise immunity, and are preferable -
especially for long cable runs or in noisy environments. Be sure to select the correct input for each
channel using the appropriate rear panel switches.
Rack mounting
The PA 7-350 is VERY heavy. Only place the PA 7-350 on racks, stands, or shelves rated to support
at least 150 pounds. We recommend using the (optional) Sherbourn Rack
Ear / Bracket assemblies, which securely support the unit and provide convenient lifting handles at
the rear and also protect the rear panel binding posts from damage.
Ventilation and cooling
Even though the PA 7-350 is very efcient, it still produces 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.
The Sherbourn 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 7-350 uses an IEC C19/C20 (20 A)
type power cord, and requires an appropriate
matching AC outlet.
We STRONGLY recommend that the PA 7-350 be attached to a dedicated power
circuit. Under real-world conditions, with typical loads, playing music, the
PA 7-350 will deliver full dynamic power when attached to a single dedicated
115 VAC 20 A circuit! If the PA 7-350 is to be used for demanding commercial
applications or under laboratory conditions, a dedicated 230 VAC 30 A circuit
is REQUIRED. Please contact Sherbourn Technical Support if you require more
information.
If you plan to operate the PA 7-350 from a power strip or power distribution system, ensure that it
is capable of delivering sufcient current. Even heavy extension cords, if of excessive length, may
cause sufcient voltage drop to impair performance or cause unsafe operating conditions, and we
do not recommend their use. Most power strips are NOT rated to carry sufcient current to power
the PA 7-350.
IEC C19/C20
COUPLER
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