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Summary of Contents for Audio Research Reference 250 SE
- Page 1 H I G H D E F I N I T I O N ® Reference 250 SE...
- Page 3 Thank you for choosing the Reference 250 SE to be a part of your high performance music listening system. Since 1970, Audio Research has been creating some of the world’s finest audio equipment. Each piece is handcrafted in Minnesota, and has been designed to provide many years of listening enjoyment.
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Page 4: Table Of Contents
Contents Warnings Installation Before Operating the Reference 250 SE In Your System Connections Back Panel Controls and Connections Input Connectors Output Connectors Matching Remote Turn-on A.C. Power Connection Operation Front Panel Controls and Displays Start-Up Shut-Down Display Brightness Adjustment Meter... -
Page 5: Warnings
Save all packaging in a dry place away from The detachable power cord on your fire hazard. Your Reference 250 SE Reference 250 SE is equipped with a heavy amplifier is a precision electronic instrument gauge, 3-conductor cable and a standard and should be properly cartoned any three-prong grounding plug. -
Page 6: Installation
FRONT Before operating the Reference 250 SE Remove all screws fastening the top cover. Your Reference 250 SE amplifier is shipped Carefully remove each vacuum tube with the vacuum tubes packed in foam from its protective foam and match its blocks. -
Page 7: In Your System
Installation In your system The ‘ambient’ operating temperature should To insure normal component life and safe never exceed 120° F or 49° C. Improper operation this unit must be operated installation will cause premature tube only in an upright position. Adequate failure and will affect your warranty, airflow and proper cooling can occur only as well as the service life of the unit. -
Page 8: Connections
Connections Back Panel Controls and Connections XLR input INPUT REFERENCE 250 MONAURAL AMPLIFIER 200K BAL PLYMOUTH, MINNESOTA MADE IN U.S.A. CAUTION RISK OF ELECTRIC SHOCK DO NOT OPEN WARNING CAUTION TO PREVENT FIRE AND SHOCK HAZARD, DO NOT EXPOSE THIS DEVICE TO RAIN OR MOISTURE. FOR CONTINUED PROTECTION AGAINST UNIT MUST BE OPERATED IN A HORIZONTAL POSITION. -
Page 9: Input Connectors
Connections Input Connectors Important The Reference 250 SE uses a fully balanced Use the best available speaker wires circuit topology and has a balanced XLR and interconnects. Audio Research input connector on the rear panel. It cannot emphasize this enough. As... -
Page 10: Remote Turn-On
Connections Remote Turn-on The Reference 250 SE has a built-in 12V DC remote turn-on/off circuit for operation by a master control system in a home theater or large audio system. Use a 3.5mm (.140”) diameter mono mini plug to connect to the +12V IN jack on the rear of the Reference 250 SE. -
Page 11: A.c. Power Connection
Only use the power switch on when properly connected to a grounded the front of the Reference 250 SE for On/ wall receptacle. If there is any question Off control of the amplifier, or the 12V regarding proper grounding procedures in start-up trigger for remote installations. - Page 12 Operation Front Panel Controls and Displays Panel output and bias meter CHECK CHECK LIGHT POWER BIAS METER VACUUM TUBE REFERENCE 250 POWER AMPLIFIER HIGH DEFINITION Meter Speed On/Off Display Bias/ Brightness Operate Main Power Switch Bias Adjust Bias Adjust V1/V3/V5 V2/V4/V6...
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Page 13: Operation
‘Light’. Press this button to toggle • Press Reference 250 SE front panel control through the three available settings. switch. Green power LED will light. • The Reference 250 SE has an automatic... - Page 14 27 watts of their 75 power level monitoring function. watt rating. This point of operation The Reference 250 SE is shipped from the provides ‘enriched’ Class AB1, and will factory with all tubes properly biased and satisfy the most critical listener.
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Page 15: Maintenance
Cleaning It is recommended that you replace the To maintain the new appearance of this vacuum tubes of your Reference 250 SE amplifier, occasionally wipe the front in sets. All of the tubes in your amplifier panel and top cover with a soft, damp have been matched to have similar (not wet) cloth to remove dust. -
Page 16: Warranty
Limited Warranty are listed on the Audio Research factory, along with a the warranty card accompanying the photocopy of the dated purchase receipt product in its shipping carton. The... -
Page 17: Specifications
Specifications Power Output: 250 watts per channel Overall Negative Feedback: 8.8dB continuous from 20Hz to 20kHz. 1kHz total Slew Rate: 20 volts/microsecond harmonic distortion typically 0.5% at 250 watts, below .04% at 1 watt. Approximate Rise Time: 1.5 microseconds actual power available at “clipping” 270 watts (1kHz). - Page 18 D E F I N I T I O N ® 3900 Annapolis Lane North Plymouth, MN 55447 www.audioresearch.com Specifications subject to change without notice. ©2015 Audio Research Corporation. Reproduction of this document in part or whole is expressly forbidden without written consent from Audio Research Corporation.
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