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Introduction

Thank you for choosing the PA 2-250 Stereo Power Amplifier. 
The PA 2-250 combines the superb sound quality and virtually endless power reserves necessary 

to satisfy a discerning audiophile. It posesses with the flexibility 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 amplification are needed. 

The Sherbourn Team

About This Manual

This manual will provide you with all the information you need to install and configure the PA 

2-250 Stereo Power Amplifier 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 flat over the audio band. A massive 

toroidal power supply and discrete fully symmetrical circuit design enable the PA 2-250 to run even 

difficult 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 flexible 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 five 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. 

Summary of Contents for PA 2-250

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Page 3: ... 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 T...

Page 4: ...r 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 yo...

Page 5: ...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 circ...

Page 6: ...e PA 2 250 2 About this manual 2 Mechanical and environmental 3 Inputs and outputs 4 Installation tips 5 Configuration 6 Performance specifications 7 Features 8 Operation 9 Periodic maintenance 10 Troubleshooting 11 10 year Limited Warranty 12 Notes 13 PA 2 250 STEREO POWER AMPLIFIER ...

Page 7: ... 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 flat over the audio band A massive toroidal power supply and discrete...

Page 8: ...g 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 9: ...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 Protect Channel Status LEDs 2 blue indicates normal operation flashing red indicates a fault may be disabled by rear panel Status LED switch Rear panel controls and indicators Power rocker switch switches mains powe...

Page 10: ...allations 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 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 amplifier is powered Off when connecting and disconnecting sp...

Page 11: ... rear panel Input Selector switches are set correctly balanced or unbalanced for each input Note Only one input balanced OR unbalanced on each channel is active at once Verify that the rear panel Status LEDs switch is set to On if you want the front panel status LEDs to be active Note When the Status LEDs switch is set to Off the two channel Status LEDs will be Off and the front panel On Off LED w...

Page 12: ...nel into 8 ohms Frequency response 20 Hz to 20 kHz 0 05 dB at 1 watt 0 6 dB at 50 kHz 1 0 dB at 80 kHz Trigger and control Trigger Input 5 20 V AC or DC Trigger Output 12 V DC 10 mA max Protection The PA 2 250 is protected against excessive operating temperature shorted speaker connections ground faults and other common fault conditions If a fault occurs the PA 2 250 will automatically power down ...

Page 13: ...quality components used throughout Independent balanced XLR and unbalanced RCA inputs for each channel Full sized five way binding posts for speaker connection Audiophile grade gold plated machined RCA connectors Trigger input and output Switchable front panel status indicators Channel Status LEDs are disabled power LED dims Intelligent protection from electrical faults Intelligent protection from...

Page 14: ...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 ...

Page 15: ... with a soft rag If something sticky gets on the front panel or case of the PA 2 250 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 PA 2 250 or into the vents ...

Page 16: ...ing a fault Verify that the input configuration for that channel is correct Check your source and your input cabling Check your speakers and speaker connections Problem No sound is heard from one or both channels the On Off LED and one or both Channel Status LEDs are flashing red The PA 2 250 is indicating a fault on one or both channels the flashing Channel Status LEDs correspond to the channels ...

Page 17: ...ITED 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 requirem...

Page 18: ... Parcels arriving without a RMA number on the outside of the box will be refused Sherbourn Technologies LLC Attn Repair Department 135 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 INCIDE...

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