The Sherbourn 4Z-75
Contents
1. CSR of Sherbourn at 1 877 EMO TECH 1 877 366 8324 Provide the CSR with a description of your problem and the serial number of the product for which the warranty claim is being made 2 The CSR will provide you with a returned material authorization number RMA 3 Ship the product to Sherbourn at the following address with the RMA written in large bold letters on the outside of the box and with the letters RMA written before the number Parcels arriving without a RMA number on the outside of the box will be refused Sherbourn Technologies LLC Attn Repair Department 131 Southeast Parkway Court Franklin TN 37064 How does state law apply This warranty gives you specific legal rights and you may also have other rights which vary from state to state CERTAIN STATES HAVE ENACTED LAWS WHICH PRECLUDE THE WAIVER OF CONSEQUENTIAL AND INCIDENTAL DAMAGES AND OR PRECLUDE THE WAIVER LIMITATION OF IMPLIED WARRANTIES TO THE EXTENT YOUR STATE HAS ENACTED A LAW WHICH PROHIBITS SUCH A WAIVERILIMITATION ALL SUCH WAIVERS LIMITATIONS CONTAINED IN THIS WARRANTY ARE INAPPLICABLE TO YOU CER TAIN STATES HAVE ENACTED LAWS WHICH REQUIRE THE DURATION OF A WARRANTY TO BE EXTENDED INCLUDING BUT NOT LIMITED TO DURING PERIODS OF REPAIR TO THE EXTENT YOUR STATE HAS ENACTED ALAW OF THIS NATURE THEN THE DURATION OF THIS WARRANTY WILL BE EXTENDED AS REQUIRED BY APPLICABLE LAW Notes All information contained in this manual2. 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 fit 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 42 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 42 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 qualified service personnel if any o
3. IEC power cord About This Manual This manual will provide you with all the information you need to install and configure the Sherbourn 4Z 75 Two Channel Four Zone Distribution Amplifier 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 Page 2 Mechanical and Environmental 1 8 SHERBOURN 42 75 75 RACK HANDLES 1 16 4 t j 4 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 Ibs 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 3 Front Panel 1 2 3 4 5 Sherbourn 9 o ON OFF VOLUME 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 flashing 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
4. LED is lit red Reason The 4Z 75 is in Standby mode Press the Standby button or assert a signal at the Trigger Input Problem No sound is heard from any speaker the On Off LED is lit blue but none of the Zone Status LEDs is lit Reason None of the zones is enabled e Press one of the Zone Enable buttons Problem No sound or distorted sound is heard from one or both channels in one or more zones the Status LED is lit blue Reason The 4Z 75 is On and is not indicating a fault e Verify that BOTH the front panel Volume and rear panel Master Volume controls are both set properly and not all the way down e Check your source and your input cabling e Check your speakers and speaker connections Problem No sound is heard the Standby LED is flashing red Reason The 4Z 75 is indicating a fault on one or both channels in one or more zones e Verify that the speaker cable s and speaker terminals are not shorted e Verify that the speaker itself is not shorted or damaged try the speaker on another channel and see if the fault moves e Verify that the source is not faulty try that input cable on another input and see if the fault moves e Disconnect all inputs and outputs and reset the 4Z 75 turn the rear panel Power rocker switch Off and back On If the fault condition persists after all inputs and outputs have been disconnected and the fault has been reset AND the Voltage Select switch is in the pro
5. Volume controls the level of the input AC power input IEC standard C13 C14 inlet and power cord two conductor Page 6 Installation Tips Zone Control The Sherbourn 4Z 75 has two channels of amplification and four separate output zones four zones each zone is stereo The front panel Zone Enable push buttons each independently connect the speakers assigned to one Zone to the amplifier outputs the push buttons toggle state and the indicator LED above each one indicates whether that zone is enabled or disabled Any combination of zones may be enabled as long as the overall load on each channel of the amplifier remains at or above 2 ohms 4 pairs of 8 ohm speakers two pairs of 4 ohm speakers or 2 pairs of 8 ohm speakers and one pair of 4 ohm speakers all satisfy this requirement Zone Enable settings persist in Standby mode when you switch from On to Standby settings are stored and restored when you switch back to On Zone Enable settings do not persist when the 4Z 75 is completely shut down either via the rear panel power switch or when AC power is removed altogether When powered On after a full AC shutdown the 4Z 75 will return to its default state Zone 1 Enabled Zones 2 4 Disabled The Volume control on the 4Z 75 remains at its current setting when power is cycled via either the front panel On Off button or the rear panel Power switch Ventilation and Cooling Even though the 4Z 75 is quite efficient it can s
6. channels of audiophile quality sound with flexible output switching and the ability to drive even the most difficult 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 flexibility The 4Z 75 is one amplifier that can solve all of your tricky distribution problems 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 difficult 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 five way binding posts and the 4Z 75 uses a convenient removable
7. excessive operating temperature shorted speaker connections ground faults and other common fault conditions If a fault occurs the 4Z 75 will automatically power down and the front panel Standby LED will flash red To reset the protection turn the 4Z 75 Off and then On again using the On Off button or the rear panel power switch after the fault has been removed Page 9 Features The Sherbourn 4Z 75 Two Channel Four Zone Distribution Amplifier combines the latest cutting edge technology with solid engineering and high quality components to deliver superior sound quality performance and features Some of the more important features of the 4Z 75 include 2 channels of fully discrete audiophile quality amplification Each channel delivers 95 watts RMS per channel x2 into 8 ohms 150 watts RMS per channel x2 into 4 ohms 270 watts RMS per channel x2 into 2 ohms One set of stereo inputs with loop output for chaining additional amps 4 sets of individually relay controlled stereo speaker outputs Front panel master Volume control and output switching controls with status indicators Stable into low impedance loads and other difficult loads Speaker connections via full sized five way binding posts Convection cooled no fans Massive toroidal power supply Intelligent protection from electrical faults Intelligent protection from thermal faults and overheating Operates from 115 VAC or 230 VAC user selectable Rack mountabl
8. is accurate to the best of our knowledge at the time of publication In keeping with our policy of product improvement we reserve the right to make changes to the design and features of our products without prior notice User Manual Revision 1 1 Feb 2013 Page 14 Sherbourn Technologies 131 Southeast Parkway Court Franklin TN 37064 www sherbourn com U MOGQ ISUS
9. materials and workmanship for the longer of the following i tne amount of time remaining under the original warranty or ii 120 days from your receipt ofthe repaired or replaced product The duration described in the previous 3 sentences is hereinafter referred to as the Term TO THE FULLEST EXTENT PERMITTED BY LAW ALL IMPLIED WARRANTIES RELATED TO THE ORIGINAL PRODUCT AND ANY REPLACEMENT PRODUCT OR PARTS INCLUDING IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE EXPRESSLY LIMITED TO THE TERM OF THIS LIMITED WARRANTY SOME STATES DO NOT ALLOW LIMITATIONS ON HOW LONG AN IMPLIED WARRANTY LASTS SO THE ABOVE LIMITATION MAY NOT APPLY TO YOU A claim under this warranty must be made by you within the Term A claim shall not be valid and Sherbourn has no obligation related to the claim if it is not made within the Term and if it is not made in strict compliance with the requirements of the How do you get service section What will Sherbourn do Sherbourn will at its option either i repair the product or ii replace the product with a new consumer product which is identical or reasonably equivalent to the product Sherbourn may provide you with a refund of the actual purchase price of the product in the event i Sherbourn is unable to provide replacement and repair is not commercially practicable or cannot be timely made or ii you agree to accept a refund in lieu of other remedies hereunder When a
10. 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 Page 4 Rear Panel 1 2 34 5 O 7 TRIGGER INPUTVOLTAGE FUSE 8 MASTER VOLUME n 0 6 O INPUT 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 five 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
11. 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 Page 5 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 five 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 flashing 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
12. product or part is repaired or replaced any replacement item becomes your property and the replaced item becomes Sherbourn s property When a refund is given the product for which the refund is provided must be returned to Sherbourn and becomes Sherbourn s property What is not covered by this warranty This warranty does not apply i to damage caused by use with non Sherbourn products where the non Sherbourn product is the cause of the damage ii to damage caused by service or maintenance performed by anyone who is not a representative of Sherbourn iii to damage caused by accident abuse misuse flood fire earthquake or other external causes iv to a product or part that has been modified after its retail purchase where the modification caused or contributed to the damage v to consumable parts such as batteries vi normal wear tear or vii if any Sherbourn serial number has been removed or defaced and Sherbourn cannot otherwise confirm that you are the original retail purchaser or authorized transferee SHERBOURN SHALL NOT BE LIABLE FOR ANY INCIDENTAL OR CONSEQUENTIAL Page 13 DAMAGES ARISING FROM OR RELATED TO ANY DEFECTS IN OR DAMAGES TO ITS PRODUCTS SOME STATES DO NOT ALLOW THE EXCLUSION OR LIMITATION OF IN CIDENTAL OR CONSEQUENTIAL DAMAGES SO THE ABOVE LIMITATION OR EXCLUSION MAY NOT APPLY How do you get service In order to make a claim under the warranty you must 1 Call a customer service representative
13. Sherbourn PA 47 75 2 CHANNEL 4 ZONE AMPLIFIER Important Safety Precautions and Explanation of Symbols A A 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 flash 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 sufficient magnitude to constitute a risk of electrical shock to the user Please read this Installation and Operation Manual thoroughly before attempting to install configure or operate the Sherbourn 4Z 75 After successful installation and configuration 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 qualified 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
14. 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 sufficient 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 sufficient forced air ventilation is provided Always install your 4Z 75 according to the manufacturer s instructions and only use attachments or accessories specified 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 47 75
15. by the assertion of a signal at the Trigger Input When the AC mains power for the 4Z 75 is powered Off using the rear panel Power switch or via an external power switch the Volume setting will remain where it was when the 4Z 75 was powered Off but the Zone Enable settings will return to the default configuration Zone 1 Enabled Zones 2 4 Disabled Zone Enable Push Buttons The front panel Zone Enable push buttons each independently connect the speakers assigned to one zone to the amplifier outputs the push buttons toggle state and the indicator LED above each one indicates whether that zone is enabled or disabled Any combination of zones may be enabled as long as the load on each channel of the amplifier remains at or above 2 ohms 4 pairs of 8 ohm speakers two pairs of 4 ohm speakers or 2 pairs of 8 ohm speakers and one pair of four ohm speakers all satisfy this requirement Rear Panel Master Volume Control The rear panel Master Volume control located to the left of the input and output RCA connectors acts as a preset level control in addition to the front panel Volume knob This controls the level of the input signal but does not control the level of the analog line level loop outputs Operating the 4Z 75 in Trigger Mode When the 4Z 75 is in Standby mode On Off LED is lit red asserting a trigger signal turns the 4Z 75 On and it remains On until the trigger is no longer asserted If the trigger signal is already active
16. e 10 year Sherbourn Technologies Limited Warranty You can find more information about the 4Z 75 Two Channel Four Zone Distribution Amplifier on our website at www sherbourn com Page 10 Periodic Maintenance The Sherbourn 4Z 75 requires no periodic maintenance Cleaning the 4Z 75 e If necessary the 4Z 75 should be cleaned gently with a soft rag If something sticky gets on the front panel or case of the 4Z 75 it should be cleaned with a mild cleaning solution applied to a soft rag followed by wiping with a clean rag dampened with plain water and drying with a soft dry rag or cloth Note DO NOT spray water or cleaning solution directly onto the 4Z 75 or into the vents Page 11 Troubleshooting If problems occur the first step should be to verify that the 4Z 75 is set to the proper line voltage for your AC power source and that your power source is operating correctly Problem No sound is heard from any speaker the On Off LED is not lit Reason You have no AC power e Verify that the circuit is live and the rear panel Power switch is On e Verify that the line cord on the 4Z 75 is fully inserted and is tight Problem Sound is clean but there is insufficient volume even when the knob is fully clockwise Reason The rear panel Master Volume adjustment is set too low e Adjust the rear panel Master Volume adjustment to a more appropriate setting Problem No sound is heard from any speaker the On Off
17. f 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 TO REDUCE THE RISK OF ELECTRICAL SHOCK DO NOT REMOVE COVER NO USER SERVICEABLE PARTS INSIDE REFER SERVICING TO QUALIFIED SERVICE PERSONNEL 42 75 Two Channel Four Zone Distribution Amplifier Contents Important Safety Precautions and Explanation of Symbols aiino LNL iS a P ee ee ee The Sherbourn 4Z 75 sn tacanel pe terei ddd b Dina e About This Maniu stare ia ara ru i e aa Mechanical and Environmental eee eee Font PNG PEDRO RR RR RPR RAR IDR RR ORI RI RR RR NINE RR PRR RI Rear Pan ERROR PRE ee Inputs and Outputs zu en Installation Dl OS nn een Configuration and Operation ccccccccccccsssssseeseeeeeeeeeeeeeeseeeeeeeees Performance Specifications sia east sa ian de iai aia Features oiiaee EEE DRP ERIE RR DIOR BEE SIE RV IRI ORE DI RER Page 1 Introduction Thank you for choosing the Sherbourn 4Z 75 Two Channel Four Zone Distribution Amplifier The 4Z 75 combines two powerful
18. per position please contact Sherbourn Technical Support Page 12 Sherbourn Technologies LLC Ten Year Limited Warranty What does this warranty cover Sherbourn Technologies LLC Sherbourn warrants its products against defects in materials and workmanship This warranty is subject to revision at any time How long does this coverage last This warranty commences on the date of retail purchase by the original retail purchaser and runs for a period of ten 10 years thereafter with the following exceptions 1 receivers including the SR 8100 SR 8200 and SR 120 preamp processors including the PT 7030 PT 720C4 and PT 7020 preamplifiers including the PRE 1 and the CD 1 CD Player with the exception of the slot load CD engine are covered by this warranty for five 5 years from the date of retail purchase by the original purchaser and 2 electromechanical components including the slot load CD engine on the CD 1 CD Player and all fans including the C 12 Cooling Unit are covered by this warranty for three 3 years from the date of retail purchase by the original retail purchaser This warranty is transferrable upon written notification to Sherbourn to any person that owns the warranted product however if ownership is transferred the Term shall be no longer than five 5 years from the date of purchase by the original purchaser Sherbourn warrants any replacement product or part furnished hereunder against defects in
19. till produce significant heat especially when driving low impedance loads To avoid overheating be sure to provide adequate clearance and ventilation especially on the top and bottom of the unit and do not block the vents 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 filled 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 flow options including external ducting includes professional features like triggered operation and thermostatic control and takes up only 2U of rack space Rack Mounting Options The Sherbourn 4Z 75 may be rack mounted using our 2RU rack mount kit Page 7 Configuration and Operation Operating Voltage Verify that the 42 75 is configured for the correct operating voltage for your area Voltage is set via the Input Voltage switch on the rear panel of the 4Z 75 Trigger and Zone Control Persistence Volume and Zone Enable settings on the 4Z 75 persist when the power is switched to Standby and returned to On via the front panel On Off push button or
20. when mains power is applied the 4Z 75 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 4Z 75 is On after being switched on by an asserted trigger the On Off switch will override the trigger and the 4Z 75 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 4Z 75 back to On Page 8 Performance Specifications 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 five 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 ANY combination that totals 2 ohms or higher per channel Power output 95 watts RMS per channel x2 into 8 ohms 150 watts RMS per channel x2 into 4 ohms 270 watts RMS per channel x2 into 2 ohms Input sensitivity for full output 800 mV S N ratio gt 95 dB A weighted Frequency response 20 Hz to 20 kHz 0 02 dB at 1 watt 1 5 dB at 80 kHz Trigger and control Trigger Input 5 20 VAC or VDC Protection The 4Z 75 is protected against
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