DS225 Manual 112 Kb
Contents
1. 5 Model DS225 audio research DEFINITION SERIES STEREO POWER AMPLIFIER DS225 HIGH DEFINITION TO PREVENT FIRE AND SHOCK HAZARD DO NOT RISK OF ELECTRIC SHOCK EET MOUTH MINNESOTA EXPOSE THIS DEVICE TO RAIN OR MOISTURE DO NOT OPEN 12V REMOTE MADE IN U S A UNIT MUST BE OPERATED IN A HORIZONTAL POSITION MODEL DS225 H CAUTION STEREO AMPLIFIER O O audio research WARNING N our DO NOT OPERATE WITH COVERS REMOVED BALANCED BALANCED UNIT CONTAINS VOLTAGES WHICH MAY BE HAZARDOUS WARNING RIGHT INPUT LEFT INPUT WARNING RISK OF HAZARDOUS ENERGY SINGLE ENDED RISK OF HAZARDOUS ENERGY MAKE PROPER SPEAKER MAKE PROPER SPEAKER CONNECTIONS CONNECTIONS SEE OWNERS MANUAL D Q SEE OWNERS MANUAL RIGHT LEFT OUTPUT CAUTION CE OUTPUT FOR PROTECTION AGAINST FIRE HAZARD REPLACE ONLY WITH SAME RATING FUSES O 6A FUSE SLO BLO 2 2301 MAX POWER CONSUMPTION 720 W50 60 HZ Model DS225 Preface Please take time to carefully read and understand the fol lowing instructions before you install or attempt to operate this equipment Becoming familiar with the product and its correct operating procedures will help assure you of maxi mum musical enjoyment and reliable operation The effort you invest now will be well rewarded in the years ahead Warnings 1 DO NOT POWER ON THIS AMPLIFIER WITH OUT INPUTS OR SPEAKER LOAD CONNECTED TO IT To prevent fire or shock hazard do not expose2. 2 12 remote start in and out jacks 2 Switches for XLR or RCA input operation L amp R IMPORTANT Use the best available speaker wires and interconnects As your system improves in reso lution from the addition of quality components it becomes increasingly important to avoid the limita tions of inferior system interconnections It is important sonically that your entire system be connected so that the audio signal arriving at the speakers has correct absolute polarity or phase i e is not inverted Connect the black or speaker ter minal to the wire that connects to the appropriate Model DS225 channel binding post on the amplifier Connect the red or speaker terminal to the wire that con nects to the appropriate channel binding post on the DS225 Using the knurled black knob tighten the binding posts firmly to assure good contact for best sonic results For bi wired loudspeaker systems i e running separate wires to bass and treble speaker termi nals simply repeat the above instructions taking care that all connections have the same or polarity AC POWER CONNECTIONS It is essential that the DS225 amplifier be connected to a wall AC power receptacle or a similar heavy duty source If it is connected to convenience receptacles on preampli fiers etc the full sonic capabilities of both the am plifier and the preamplifier will be compromised The AC power sourc
3. Owner s Manual DEFINITION SERIES Model DS225 STEREO POWER AMPLIFIER audio research HIGH DEFINITION 3900 ANNAPOLIS LANE NORTH PLYMOUTH MINNESOTA 55447 5447 PHONE 763 577 9700 FAX 763 577 0323 Wwww audioresearch com Contents Model DS225 Page No ISI LE ulus Gee zs mamataq Susa s Zam Sus eee Be S es 1 hs usos Se sus ps Q Ses S eee oes Gaga ws 1 PACKAGING coke eu RiGee ee kb Gea eo wee He acon tee sweet es teen eee ee eee eee bas 1 Accessories Lu he ee oe EE Pe Ee ee ee et Description of Controls Conneclions 1 2 Single Ended Operation 2 Balanced Operaio u c eo eee ore ea aoe OS ee eee 2 Installcdfion 2 3 Remote Turn on Connections 3 peraring Procedure ORR Eee OR Ee aa 3 Start Up Following Protect Shutdown 3 2024 ov tee eee eo ee pete eae ea 3 SE eo Gee 4 Disposal and Recycling Guidelines 4 Limited EE ee ee ee 4 Specifications
4. form of isolation to prevent ground loops and associated hum Single Ended Operation Single ended inputs should be used with a pream plifier or electronic crossover etc having single ended outputs which does not invert overall phase or polarity When using single ended inputs set two rear panel toggles to SE position Disconnect any balanced cables Balanced Operation Balanced inputs can be used with a preamplifier or electronic crossover etc having balanced outputs When using the balanced inputs set two rear panel toggles to BAL position Disconnect any single end ed cables Installation The amplifier may be installed in a ventilated cabi net observe the following guidelines to maximize the performance and service of your amplifier With proper installation the DS225 may be left on continuously for maximum performance on demand it will draw approximately 35 watts of AC power at idle However the DS225 has been designed and engineered to minimize any warm up necessary for best sonics generally a half hour or 45 minutes of actual playing time will bring the amplifier around to more than acceptable performance lev els with some additional improvement noticeable over the next hour or two Warm up characteristics will depend upon ambient room temperature at start up the nature of the installation and the re solving power of the associated equipment Operate the DS225 only in a horizontal upright pos
5. this product to rain or moisture N 9 This unit operates on voltages which cause serious injury or death Do not operate with cov ers removed Any necessary servicing should be carried out by your authorized Audio Research dealer or other qualified personnel A The 14 gauge 3 conductor power cord on this unit is equipped with a standard 3 prong grounding plug If used normally it will provide a safe earth ground connection of the chassis Refer to section on AC Power Connections for detailed information For safe operation and protection against fire hazard replace fuses only with those of the same type and rating of fuses as specified Packaging Save all packaging accompanying this product You have purchased a precision electronic instrument and it should be properly cartoned any time ship ment becomes necessary It is very possible that this unit could be damaged during shipment if repack aged in cartoning other than that designed for it The original packaging materials help protect your investment from unnecessary damage delay and added expense whenever shipment of this unit is required Unpacking The DS225 is packed within two cartons inner and outer which have foam supports in between Be cause of the weight of the unit and because it is a precision electronic instrument it is necessary to take reasonable care during unpacking and prepa ration for use It is best to have a
6. It may be played immediately although best son ic performance will in most cases not be achieved for an hour or so see INSTALLATION for further details Start Up Following Protect hutdown The DS225 amplifier uses a sophisticated non fused sensing circuit to protect the amplifier from DC at the input from thermal overload and from shorting conditions at the output e g defective speaker leads etc This circuit also helps prevent damage to your loudspeakers When the amplifier senses a fault condition in either channel from excessive DC or excessive output cur rent it will automatically shut off left or right outputs from the amplifier Amplifier will automatically re turn to normal operation when fault is removed If the amplifier fails to resume normal operation af ter removal of a fault condition contact your autho rized dealer for further assistance Servicing Because of its careful design and exacting stan dards of manufacture your DS225 amplifier should normally require only minimal service to maintain its high level of performance CAUTION The DS225 amplifier contains sufficient levels of voltage and current to lethal Do not tamper with a component or part inside the unit Even with the power turned off a charge remains in the energy storage capacitors for some time Refer any needed service to your authorized Audio Research dealer or other qualified technician Additional questions regardi
7. als may be disposed of q normal manner Limited Warranty Audio Research Corporation products are covered by a 3 Year Limited Warranty or a 90 Day Limited Warranty vacuum tubes This Limited Warranty ini tiates from the date of purchase and is limited to the original purchaser or in the case of demonstra tion equipment limited to the balance of warranty remaining after original shipment to the retailer or importer In the United States the specific terms conditions and remedies for fulfillment of this Limited Warranty are listed on the warranty card accompanying the product in its shipping carton or may be obtained from the authorized retailer or from the Audio Research Customer Service Department Outside the United States the authorized importing retailer or distributor has accepted the responsibility for war ranty of Audio Research products sold by them The specific terms and remedies for fulfillment of the Limited Warranty may vary from country to country Warranty service should normally be obtained from the importing retailer or distributor from whom the product was purchased In the unlikely event that technical service beyond the ability of the importer is required Audio Research will fulfill the terms and conditions of the Limited Warranty Such product must be returned at the purchaser s expense to the Audio Research fac tory along with a photocopy of the dated purchase receipt for the product a written de
8. e for the amplifier should be capable of supplying 6 amperes for 100 or 120 volt units or 3 amperes for 220 or 240 volt units For the very best performance on domestic 100 or 120 volt circuits the DS225 should be connected to its own AC power circuit branch protected by a 15 amp breaker The preamplifier and other audio equipment should be connected to a different power circuit and breaker Avoid the use of extension cords If they must be used on a temporary basis use 14 gauge or heavier cords The DS225 utilizes a compatible grounding system that generally does not require a ground lifter adapter plug on the AC power cord to minimize hum The power cord on your DS225 has a stan dard three prong grounding plug to provide maxi mum safety when it is connected to a grounded wall receptacle If there is any question regarding the safety of grounding procedures be certain to seek competent help with the installation Do not substi tute a lighter gauge power cord for the one sup plied with this unit If an electronic crossover or other AC powered equipment is used with the amplifier it may be nec essary to use ground lifter adapters on the power plugs of that equipment to minimize system hum Generally the lowest hum is achieved when the only direct connection between audio common ground and true earth ground occurs in the pre amplifier through its grounded power cord Other equipment in the system should have some
9. inuous 12VDC signal at 20mA per DS225 for the duration of amplifier on time Do not use a mo mentary or data pulse control signal The front power switch on the DS225 must be off to use the remote turn on Front power switch is dis abled when 12 volt trigger is energized The front power switch will not turn the DS225 off if the 12 volt trigger is energized The 12VDC remote jacks have polarity protection so they will not operate if a 12VDC signal is acci dentally connected or if the control wires are reversed Operating Procedure 1 Make sure you have read and followed the IN STALLATION and CONNECTION instructions prior to attempting operation Secure all rear panel connections between DS225 and input source and loudspeakers Make sure the amplifier is properly connected to a high current AC power receptacle via the sup plied power cord see CONNECTIONS Your preamplifier should be On and muted and or set at minimum gain Turn Power switch from Off to On Unit is ready to play when LED is on Note if the power indicator LED fails to light turn the Power switch to Off and check the appropriate fuse for pos sible failure Extra fuses for AC power are includ ed with the unit If green light is blinking after 9 P turn low line voltage condition exists turn off amplifier and check line voltage 6 Your amplifier should now operate satisfactorily
10. ition Adequate airflow and proper cooling can be maintained only if there is no restriction around the unit The five 5 non marring feet provide adequate spacing and mechanical damping only from a smooth hard surface Never operate the unit while it is sitting on a soft irregular surface such as a rug or carpet If the unit is to be operated in an enclosure such as an equipment rack make certain that adequate air flow above and below the unit is provided The ambient operating temperature should never ex ceed 120 F or 49 Improper installation will cause premature component failure and will affect your warranty as well as the service life of the unit N Model DS225 It is normal for the DS225 power amplifier to run lightly to moderately warm to the touch All compo nents within are operated at safe conservative lev els and will not be improperly affected providing the requirements outlined above are adhered to Remote Turn on Connections The DS225 has a built in 12VDC 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 mini plug to connect to the 12V IN jack on the rear of the DS225 Two identical leled jacks are provided to allow chaining connec tions to control two or more DS225s or other equip ment The 12V IN jack should be connected to the 12VDC output of the master control system using a cont
11. large open work area with available help Set the carton upright in the center of the work area and with a small knife carefully slit the taped edges of the outer carton s top flaps Fold the flaps to the sides and while holding the inner carton in place roll the unit upside down You can now lift the outer carton off and set it and the filler panels aside Now slit the inner carton s taped seams on the bottom now facing upward Again fold the flaps over and while holding the unit in roll it over as before You can now lift the inner carton off to find your 05225 sitting upright undamaged and uncartoned Carefully remove the plastic wrap Now while it is fresh in your mind reassemble the carton system for future use Accessories Spare Fuses 2 6 MDA slo blo 100 amp 120v 2 2 Amp Super Time Lag TT 220 240V Description of Controls The front panel has 1 Power line On Off switch 1 Power On LED Green indicator POWER ON OFF SWITCH Press the power switch to initiate or terminate AC line power to the amplifi er When the LED is illuminated the amp is on and ready to play Connections The rear panel has 2 RCA input connectors for single ended connections L amp R 2 XLR input connectors for balanced connection L amp R 4 Output binding posts L amp R 1 Power line fuseholder 1 Power line cord 15A IEC connector for remov able power cord supplied
12. ng the operation main tenance or servicing of your amplifier may be re ferred to the Customer Service Department of Audio Research Corporation at 763 577 9700 CST When ordering a service manual from Audio Research or an authorized dealer be sure to identify the serial number on your amplifier x Model DS225 Cleaning To maintain the new appearance of this unit occa sionally wipe the front panel and top cover with a soft damp not wet cloth to remove dust A mild non alkaline soap solution or dilute isopropyl alco hol may be used to remove fingerprints or similar smudges Cleaners containing abrasives should not be used as they will damage the anodized finish of the front panel A small soft paint brush is effective in removing dust from bevels the recessed name plate and other features of the front panel Disposal and Recycling Guidelines To dispose of this electronic product do not place in landfill In accordance with the European Union Waste Electrical and Electronic Equipment WEEE directive effectiveAugust 2005 this product may contain regulated materials which upon disposal re quire special reuse and recycling processing Please contact your dealer or importing distributor for instructions on proper disposal of this product in your country Or contact Audio Research Corpora tion 763 577 9700 for the name of your importing distributor and how to contact them Packing and shipping materi
13. scription of the problem s encountered and any information necessary for return shipment The cost of return shipment is the responsibility of the purchaser Model DS225 Specifications POWER OUTPUT 225 watts per channel into 8 ohms 1 THD 360 watts per channel into 4 ohms both channels driven FREQUENCY RESPONSE 3dB points at 1 watt 5Hz to 55 kHz INPUT SENSITIVITY 2 15V RMS for rated output 26 0dB Gain single ended or balanced INPUT IMPEDANCE 150K ohms single ended 300K ohms balanced differential OUPUT POLARITY Non inverting from single ended inputs Balanced pin 2 IEC 268 OUTPUT REGULATION 0 06dB 8 ohm load to open circuit Damping factor 167 OUTPUT CURRENT 15 amps peak at protective shut down SLEW RATE 5 volts microsecond 20 maximum duty cycle RISE TIME 5 0 microseconds HUM amp NOISE 300 microvolts RMS 103dB below rated output IHF A weighted POWER SUPPLY CAPACITANCE 160 000 uF total POWER REQUIREMENTS 100 125VAC 60Hz 200 250VAC 50Hz 488 watts at rated output 225WPC 8 ohms 758 watts at 360WPC 4 ohms 35 watts idle Standby 1 watt DIMENSIONS 19 48 cm W standard rack panel x 51 4 13 3 cm H x 141 4 36 2 cm D front panel back Optional handles extend 11 2 3 8 cm forward of the 1 4 thick front panel Output connectors extend 0 9 be hind rear panel WEIGHT 34 9 Ibs 15 8 kg Net 41 Ibs 18 6 kg Shipping Specifications subject
14. to change without notice 2010 Audio Research Corporation
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