Sherbourn PA 4Z-75 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 a risk of electrical shock to the user.
Please read this Installation and Operation Manual thoroughly before attempting to install, congure,
or operate the Sherbourn 4Z-75. After successful installation and conguration of the 4Z-75, 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 4Z-75 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 REDUCE THE RISK OF FIRE OR ELECTRIC SHOCK, DO NOT USE THE
4Z-75 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 (SUCH AS VASES) ARE PLACED ON IT. DOING SO
MAY RESULT IN DAMAGE TO THE 4Z-75 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 4Z-75. THERE ARE NO USER-SERVICEABLE PARTS INSIDE THE 4Z-75. REFER ALL
SERVICE TO QUALIFIED SERVICE PERSONNEL.
Do not install the 4Z-75 near or above any heat sources such as radiators, heating vents, or other
apparatus that produces heat. Do not block any ventilation openings or heat sinks. Avoid installing the
4Z-75 directly above other heat-producing equipment unless sufcient ventilation or forced-air cooling
is provided.
Do not install the 4Z-75 in locations without proper ventilation. The 4Z-75 should not be operated
on a bed, sofa, rug, or similar surface that may block vents. The 4Z-75 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 4Z-75 according to the manufacturer’s instructions and only use attachments or
accessories specied by the manufacturer.
Do not install the 4Z-75 on any stand, shelf, or other piece of furniture that is unable to support its
weight. If a cart is used to move the 4Z-75, use caution to avoid injury from tip-over.
Connect the 4Z-75 only to power sources of the correct voltage (as shown in this manual and on the
4Z-75). Ensure that the Input Voltage selector switch on the rear of the 4Z-75 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 4Z-75 unit.
Only connect the 4Z-75 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 obsolete outlet. If you replace the 4Z-75 power cord, only use one of similar type and equal or
greater current rating.
!
!
The power cable for the 4Z-75 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 4Z-75 with a fuse of proper value and voltage rating.
The 4Z-75 should only be cleaned as directed in the Installation and Operation Manual. Avoid spraying
liquids directly onto the 4Z-75 and NEVER spray liquids into the vents. Care should be taken so that
small objects do not fall into the inside of the 4Z-75.
You should seek service for your 4Z-75 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 4Z-75 has been exposed to rain.
4. The 4Z-75 exhibits a marked change in performance.
5. The 4Z-75 has been dropped, or its enclosure or chassis is damaged.
NOTE: TO COMPLETELY DISCONNECT THE 4Z-75 FROM THE AC POWER MAINS,
DISCONNECT THE AC POWER CORD FROM THE AC RECEPTACLE.
NOTE: THE AC POWER CORD FOR THE 4Z-75 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.
Page 1
Contents
Important Safety Precautions and Explanation of Symbols
Introduction.................................................................................................2
The Sherbourn 4Z-75 .................................................................................2
About This Manual......................................................................................2
Mechanical and Environmental ..................................................................3
Front Panel.................................................................................................4
Rear Panel..................................................................................................5
Inputs and Outputs .....................................................................................6
Installation Tips...........................................................................................7
Conguration and Operation ......................................................................8
Performance Specications........................................................................9
Features ...................................................................................................10
Periodic Maintenance...............................................................................11
Troubleshooting........................................................................................12
Sherbourn Technologies, LLC Ten-Year Limited Warranty.......................13
Notes ........................................................................................................14
4Z-75
Two-Channel Four-Zone Distribution Amplier
Page 2
Introduction
Thank you for choosing the Sherbourn 4Z-75 Two-Channel Four-Zone Distribution Amplier.
The 4Z-75 combines two powerful channels of audiophile quality sound with exible output switching
and the ability to drive even the most difcult loads. The 4Z-75 can run any pair of speakers, or any
combination of pairs of speakers in up to four different zones, with ease - even multiple pairs with
different impedances - as long as the total impedance on each stereo channel remains at or above 2
ohms.
The 4Z-75 uses proven technology, including class A/B circuitry, Sherbourn’s intelligent protection
system, and true commercial grade construction and components, to deliver excellent sound,
superior performance, outstanding reliability, and amazing exibility. The 4Z-75 is one amplier that
can solve all of your tricky distribution problems.
About This Manual
This manual will provide you with all the information you need to install and congure the Sherbourn
4Z-75 Two-Channel Four-Zone Distribution Amplier to achieve its optimum potential. The manual
also includes a brief summary of the features offered by the 4Z-75 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 Sherbourn 4Z-75
The 4Z-75 can deliver up to 95 watts / channel into 8 ohms, 150 watts / channel into 4 ohms, or
270 watts / channel into 2 ohms; which you can use to provide power to one very difcult load, or to
run four pairs of 8 ohm speakers in four different zones - each at 65 watts / channel, or to run any
combination of speakers that you need to.
The 4Z-75 has four sets of independently relay-switched stereo speaker outputs, with convenient
front panel controls for each, and a single master Volume control. It also includes a pass-
through output for driving additional equipment, and a standard trigger input and output. Speaker
connections are all via full-sized ve-way binding posts, and the 4Z-75 uses a convenient removable
IEC power cord.
Page 3
Mechanical and Environmental
17”
19”
18”
16.75”
3.5”
TOP
FRONT
SIDE
1/16”
4”
RACK HANDLES
SHERBOURN 4Z-75
Dimensions:
17” wide x 4” high x 18.25” deep (includes feet, binding posts, knobs, no rack kit)
Weight:
27 lbs / 12.5 kg (unboxed); 38 lbs / 17.5 kg (boxed)
Rack mountable:
Yes, with optional rack mount kit
Power requirements:
115 VAC or 230 VAC +/- 10% @ 50 / 60 Hz (selectable by rear-panel switch)
Ventilation and cooling:
To avoid overheating, be sure to provide adequate clearance and ventilation.
Page 4
Front Panel
1. On / Off Pushbutton
Toggles the 4z-75 between On and Standby.
2. On / Off Indicator LED
Red indicates Standby mode; blue indicates normal operation; ashing red indicates a Fault.
3. Zone Enable Pushbuttons (one for each zone)
Toggle the status of each zone (individually) On or Off.
4. Zone Status LEDs (one for each zone)
Each Zone Status LED illuminates blue the corresponding zone is enabled.
5. Volume Knob
Sets the output level (gain) for all zones. (The maximum gain on the Volume knob is limited by the
setting of the Master Volume adjustment on the back panel.)
1 2 3 4 5
ON / OFF 1 2 3 4 VOLUME
Page 5
Rear Panel
1. Trigger Input and Output
The Trigger Input is used to allow other trigger-enabled equipment to switch the 4Z-75 between On
and Standby. The Trigger Output is always active when the 4Z-75 is On, and is used to control other
trigger-enabled equipment.
2. Master Volume (preset adjustment)
Sets the overall / maximum gain for the 4Z-75 (works in conjunction with the front
panel Volume knob).
3. Line Input Connectors (one per channel; unbalanced)
Connect your stereo input to these connectors.
4. Line Ouput Connectors (one per channel; unbalanced)
Provides a passthrough connector for connecting additional equipment.
5. Speaker Terminals (one pair per channel per zone)
Connect speakers to these ve-way binding posts. Each zone has connections for one pair of stereo
speakers; speakers for each zone are individually relay switched.
6. Power Switch
Switches the AC mains power to the 4Z-75 On and Off. When this switch is Off, the 4Z-75 will not
respond to trigger signals or manual controls.
7. Input Voltage Selector Switch
Always ensure that this switch is set for the proper line voltage for your area and installation.
8. AC Line Fuse Holder
Always replace the fuse with a time delay (slow-blow) fuse of the same value.
9. Standard IEC power inlet.
The PA 18-45 can be used with either a two-wire or three-wire standard IEC power cable.
1 2 3 5 6
CH2 CH1 CH2 CH1 CH2 CH1 CH2 CH1
ZONE 4 ZONE 3 ZONE 2 ZONE 1 INPUT VOLTAGE FUSE
POWER
MASTER
VOLUME
IN
OUT
CH2 CH1
TRIGGER
INPUT
OUTPUT
7
8
9
4
Page 6
Inputs and Outputs
Input sensitivity (for full output into 8 ohms):
800 mV
Analog inputs:
One stereo pair of unbalanced (RCA) inputs.
Analog (line level) outputs:
One stereo pair of unbalanced (RCA) outputs .
Speaker outputs:
8 pairs of full-sized ve-way binding posts
(one pair for each channel in each zone; Channel 1, zones 1-4 and Channel 2, zones 1-4).
Minimum recommended load impedance (per channel):
ANY combination that totals 2 ohms or higher 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.
Zone Enable (4 pushbuttons); 1 through 4; individually enable each zone.
Zone Status; LEDs (4); indicate when each zone is enabled.
Volume (knob).
Rear panel controls and indicators:
Power (rocker switch); switches mains power.
Input Voltage (protected slide switch); selects 115 or 230 VAC line voltage.
Master Volume; controls the level of the input .
AC power input:
IEC standard C13/C14 inlet and power cord (two conductor).
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