Jeff Rowland Design Group 501 User's Manual
Contents
1. 501 Mono Amplifier must not be modified in any way other than according to official service bulletins from JRDG Otherwise the factory warranty will be immediately voided JEFF ROWLAND DESIGN GROUP 2007 ALL RIGHTS RESERVED Be sure the amplifier power switch is turned off or AC power cable is removed before connecting or disconnecting any loudspeaker or interconnect cables When operating the Model 501 a properly grounded AC receptacle should be used A potential shock hazard may result if the supplied 3 wire grounded AC cable ground terminal is defeated or lifted or the unit is connected to a 2 wire ungrounded AC outlet cC Su EE G G The Model 501 is designed to per form optimally with no adjustments or maintenance for the lifetime of the product Do not attempt to open the bottom cover of the amplifier and refer all service issues to qualified personnel The voltages inside the Model 501 can be hazardous Because of the energy efficiency of the Model 501 there is no need to turn the unit off when not in use except in the event of severe voltage hazards as mentioned previously 10 PO BOX 7231 COLORADO SPRINGS COLORADO 80933 USA SIGNAL amp POWER CONNECTIONS OWNER S MANUAL MODEL 501 MONO AMPLIFIER The Model 501 Mono Amplifier offers unprecedented compatibility with associated audio and A V components When connecting or discon necting speaker or interconnect cables the amplifier Master AC2. Power Switch 5 should be turned OFF 1 POWER INDICATOR LED When the amplifier is connected to AC mains and the Master AC Power Switch 5 is turned ON the small front panel power indicator will illuminate blue When the Master AC Power Switch is OFF the indicator will be off f E MAIL JRDG JEFFROWLAND COM 2 BALANCED SIGNAL INPUT If you are using balanced XLR inter connects from your source components they should be connected to the balanced input connector The connector unlocking tab must be pressed to disconnectthe XLR interconnect cable from the amplifier NOTE Pin 2 of the XLR connector is signal positive with respect to speaker output positive Also JRDG recommends balanced cables as the preferred method of interconnection XLR to RCA adaptors are available from JRDG if RCA single ended interconnects are used Amplifier gain is not affected by choice of input type SERIAL MD0000 BALANCED INPUT Bo 3 MODEL 501 MONO AMPLIFIER INPUT IMP MADE IN U S A 40K OHMS WWW JEFFROWLAND COM TELEPHONE 719 473 1181 SIGNAL amp POWER CONNECTIONS OWNER S MANUAL MODEL 501 MONO AMPLIFIER 3 LOUDSPEAKER OUTPUT Unscrew the knob that secures the speaker output connector and pull the securing block out far enough to allow access to the binding posts Install the positive usually red loudspeaker cable spade terminal to the positive binding post and the negati
3. notify your dealer immediately We strongly suggest that you save all of the packing materials If the amplifier is returned to your dealer or J RDG the original packing materials must be used for shipment to avoid possible damage Neither J RDG northe shipper can be held responsible for damages incurred during transit if the original factory packing is not used All factory returns require that RDG issue a Return Authorization RA number prior to shipment JEFF ROWLAND DESIGN GROUP 2007 ALL RIGHTS RESERVED 6 PO BOX 7231 COLORADO SPRINGS COLORADO 80933 USA MAINTENANCE amp CLEANING OWNER S MANUAL MODEL 501 MONO AMPLIFIER All J RDG products are designed to provide a lifetime of enjoyment and listening pleasure The Model 501 Mono Amplifier is uniquely constructed from a solid block of precision machined aluminum It s chassis is sealed to prevent dust from entering the interior of the chassis and thus should never need interior cleaning during the lifetime of the product All internal circuitry is maintenance free such that no adjustments of any kind are necessary over the lifetime of the product If the amplifier is ever in need of service updating or upgrading it should only be returned to an authorized repair facility or technician for servicing The front panel of the unit is precision machined in a unique process thatincorporates a diamond tipped cutting tool This process was refined over many years to produce an attrac
4. 501 Mono Amplifier please contact your authorized J eff Rowland Design Group dealer or check the J eff Rowland Design Group web site at www jeffrowland com Enjoy the music J eff Rowland President J eff Rowland Design Group WWW JEFFROWLAND COM TELEPHONE 719 473 1181 PRODUCT FEATURES OWNER S MANUAL MODEL 501 MONO AMPLIFIER e XLR input connector for balanced system configurations Same gain and input impedance characteristics are ensured whether XLR or RCA adapted inputs are used Transformer coupled input provides universal compatibility with other components and eliminates ground loop noise and EMI e High efficiency ICEpower amp power conversion technology generates high output power with very little heat promotes long component life and permits a relatively small physical size JEFF ROWLAND DESIGN GROUP 2007 ALL RIGHTS RESERVED Multistage AC line filtering in power supply reduces AC line noise pollution throughout amplifier signal circuitry CE approved speaker output terminals require no tools for secure low resis tance connections Fully balanced topology implemented in both input and output circuitry Proprietary switch mode power supply technology ensures consistent performance under all operating and AC line conditions Low power consumption permits constant power up operation to eliminate warm up time Selectable overall gain of 26 or 32 dB Ultra low reso
5. J 103 on the rear panel board ofthe unit Using needle nose pliers move the jumper from between pins 2 and 3 to pins 1 and 2 See FIGURES 1 and 2 Overall amplifier gain increases to 32 dB STEP 4 Reinstall the bottom cover and replace the ten screws to secure itto the chassis JEFF ROWLAND DESIGN GROUP 2007 ALL RIGHTS RESERVED DEFAULT 26 dB GAIN 1 2 3 ALTERNATE 32 dB GAIN FIGURE 2 Close up of J103 settings for the Model 501 FIGURE 1 Location of Jumper J103 on the inside back panel of the Model 501 RISK OF ELECTRICAL SHOCK WARNING The instructions in this section are meant for qualified JRDG service personnel only however if you as an end user choose to attempt these adjustments yourself JRDG cannot be held liable for any damage that may occur to your Model 501 Mono Amplifier because of your actions Further accessing the interior of your Model 501 by removing the bottom cover can expose you to dangerous potentially lethal electrical voltages Thus JRDG cannot be held liable for any injury you may sustain should you undertake any of these adjustments yourself 15 PO BOX 7231 COLORADO SPRINGS COLORADO 80933 USA E MAIL JRDG JEFFROWLAND COM WWW JEFFROWLAND COM TELEPHONE 719 473 1181
6. OWNER S MANUAL MODEL 501 MONO AMPLIFIER n NR INTRODUCTION OWNER S MANUAL MODEL 501 MONO AMPLIFIER Welcome to the J eff Rowland Design Group family and congratulations on your purchase of what is unquestionably one of the world s finest amplifiers With its combination of features such as precision electronic circuitry exceptional efficiency and accurately machined chassis compo nents throughout your Model 501 Mono Amplifier will offer you many years of musi cally satisfying enjoyment Please take a few minutes to read the remainder ofthis Owner s Manual before proceeding with the installation of the amplifier A thorough understanding of the operational features will allow you 2 PO BOX 7231 COLORADO SPRINGS COLORADO 80933 USA to gain the maximum performance and ease of use for which this amplifier was designed Please note that your Model 501 Mono Amplifier serial number begins with the letters MD This serial number is located on the rear panel of the chassis Please include this number with any corre spondence regarding your Model 501 Mono Amplifier It has been my joy to create an audio component of enduring value that reflects the highest ideals of musical and artistic expression It is my hope that these qualities will enrich your experience and pride of ownership E MAIL JRDG JEFFROWLAND COM If you have any additional questions regarding the installation or operation ofthe Model
7. an the chassis The use ofa cleanser or abrasive to clean the chassis that has not been approved by the factory will almost certainly damage the finish and will not be covered under warranty NOTE Cleaner polish should be applied directly to the cloth and not the chassis JEFF ROWLAND JEFF ROWLAND DESIGN GROUP 2007 ALL RIGHTS RESERVED PROTECTION SYSTEMS The Model 501 Mono Amplifier is equipped with internal fuses for protection against excessive AC current draw however since no protection circuitry or system can completely protect a product from every electrical hazard certain precautions should be observed In the event of severe voltage hazards such as lightning or when the amplifier will not be used for extended periods of time the amplifier should be unplugged from the AC mains to avoid potential damage to the internal circuitry All other audio video system components should also be disconnected from AC mains power as hazardous voltages can easily travel throughout an interconnected system INSTALLATION USE amp CARE OWNER S MANUAL MODEL 501 MONO AMPLIFIER Locate the amplifier as close as possible to its final installation point Allow access to the rear panel for making connections Due to it s design the Model 501 Mono Amplifier is energy efficient eliminating the need for heatsinks or forced air cooling As a result the Model 501 Mono Amplifier can be housed in a cabinetor custom enclosure
8. e expensive and esoteric accessories As we have never found the perfect or universal power conditioner or cable itis not possible to recommend any particular type or brand for use with the Model 501 Mono Amplifier Please use your dealer s help and knowledge as a resource to select the proper accessories for your individual system needs NOTE Due to the exceptionally low power consumption rating of the Model 501 it is recommended that the unit not be disconnected from AC mains unless it is to be moved or reinstalled in another location It is recommended that the amplifier simply be left on when the unit is not in use WARNING Serious damage to internal circuitry can occur if improperly wired or unapproved AC power cords are used Your dealer can be a helpful resource for selecting the proper accessories for your needs Also if the unit is plugged into a voltage different from the range listed on the back panel it will result in serious damage and will void the warranty 12 PO BOX 7231 COLORADO SPRINGS COLORADO 80933 USA E MAIL JRDG JEFFROWLAND COM WWW JEFFROWLAND COM TELEPHONE 719 473 1181 SPECIFICATIONS OWNER S MANUAL MODEL 501 MONO AMPLIFIER Output Power Continuous RMS Frequency Response Peak Output Current Dynamic Range Load Impedance Range Input Impedance THD Noise 0 1 watts 500 watts 4 ohm CCIF Intermodulation Distortion 19 20 kHz Damping Factor 1 kHz Overall Gain Common Mode Rejection Ratio Ab
9. nance structurally rigid chassis precision machined from a solid block of aircraft grade 6061 T6 aluminum Remote ON OFF input jack allows amplifier standby operation from a remote source for inclusion into home theater A V systems PACKAGE CONTENTS OWNER S MANUAL MODEL 501 MONO AMPLIFIER Ensure that all of the auxiliary components listed below are enclosed within the shipping carton and accessory box Refer to the illustrations and verify that the proper components are included MODEL 501 MONO AMPLIFIER AC POWER CABLE WARRANTY CARD OWNER S MANUAL 4 PO BOX 7231 COLORADO SPRINGS COLORADO 80933 USA E MAIL JRDG JEFFROWLAND COM WWW JEFFROWLAND COM TELEPHONE 719 473 1181 INITIAL INSPECTION OWNER S MANUAL MODEL 501 MONO AMPLIFIER Inspectthe shipping container for damage If any portion ofthe shipping container packing material amplifier or accessories are damaged or missing notify your dealer and the shipper if a claim is to be made immediately NOTE Many shippers require notification and inspection within 24 hours of delivery to determine the nature of damages incurred Your Model 501 Mono Amplifier has undergone extensive performance evaluations listening tests quality control inspections and a minimum 72 hour burn in period prior to shipment and should therefore be in perfect operating condition upon delivery If the amplifier does not operate correctly please
10. perly isolate the amplifier output Please contact JRDG before connecting these types of subwoofers 11 SIGNAL amp POWER CONNECTIONS OWNER S MANUAL MODEL 501 MONO AMPLIFIER 6 12V REMOTE TRIGGER A 1 8 3 5 mm mini plug connector is provided on the rear panel for remotely switching the amplifier between Operational and Standby modes When connected to another component with the proper circuitry the amplifier standby function can be turned ON and OFF remotely in a custom installation theater or automated system setup See FIGURE 1 Constant 3v To 15v DC Signal 12VDC Typical tip Ground sleeve FIGURE 1 Detail of 12V remote trigger and mini plug connector requirements NOTE Please be aware that the remote feature simply places the amplifier in standby mode and does not disconnect the unit from power or AC mains NOTE If a 12V DC switching source is not available then a short circuit between the tip and sleeve of the 1 8 mini plug connector will place the amplifier into the STANDBY MODE Removing the short circuit will return the amplifier to the OPERATIONAL MODE POWER CONDITIONING AC power conditioners and AC mains power cables are a common accessory in many high performance audio and video systems and can be used to improve the quality of reproduction in certain instances We have tried to provide the best possible basic power cord with the Model 501 however many users wish to experiment with mor
11. solute Phase Inputs Outputs Power Consumption Amplifier Weight Overall Amplifier Dimensions H x W x D JEFF ROWLAND DESIGN GROUP 2007 ALL RIGHTS RESERVED 500 watts 8 ohms 1000 watts 4 ohms 5 Hz 45 kHz 3 dB 8 ohms gt 45 amps 120 dBa 2 ohms 16 ohms 40k ohms lt 1 Typically 01 1 kHz 00296 1000 Selectable Internal J umper 26 or 32 dB gt 90 dB 20 Hz 20 kHz Non inverting Pin 2 Positive 1 Balanced XLR Unbalanced operation requires an optional XLR to RCA adapter 1 CE Approved Speaker Wire Clamp Idle 15 watts Maximum 1300 watts 17 lbs 7 8 kg 3 3 x 8 4 x 14 6 85 mm x 213 mm x 372 mm 15 DIMENSIONS OWNER S MANUAL MODEL 501 MONO AMPLIFIER oo 8 4 in 213 mm 4 uuu ZZ Ul g z uuu Z6Z U O L 14 6 in 372 mm L 58 ul 1 14 PO BOX 7251 COLORADO SPRINGS COLORADO 80933 USA E MAIL JRDG JEFFROWLAND COM WWW JEFFROWLAND COM TELEPHONE 719 473 1181 OPTIONAL ADJUSTMENTS OWNER S MANUAL MODEL 501 MONO AMPLIFIER ADJUSTING AMPLIFIER OVERALL GAIN STEP 1 Unplug the Model 501 Mono Amplifier power cable from the wall AC outlet STEP 2 Place the unit upside down on a soft clean surface Using a 2 Phillips screwdriver remove the ten screws that secure the bottom cover ofthe unit STEP 3 Locate jumper
12. tive and unique appearance Because the surface is not finished in the typical fashion of most audio and video equipment there are a few rules that must be kept in mind when cleaning the equipment E MAIL JRDG JEFFROWLAND COM Please allow the front panel which is coated with an automotive grade polyure thane finish to cure for 6 months before attempting to clean it This will prevent small scratches from marring the surface before the surface coating has had a chance to harden completely The front panel of the unit should never be cleaned with anything other than a very soft cotton cloth and plain water or fine oil based furniture polish Because of the fine finish of the front panel use of any other cleaning agent may permanently scratch the finish The top cover sides and bottom are protected by a durable black anodized finish and can be cleaned with a soft cotton cloth such as an optical lens cleaning cloth or fine furniture polishing rag dampened with plain water Water should be applied directly to the cloth and not the chassis A very mild plastic or glass cleaner that does not contain ammonia may also be used If a mark has been left on the chassis do not use any type of abrasive or chemical cleaner to remove the mark WWW JEFFROWLAND COM TELEPHONE 719 473 1181 If you have any questions aboutthe care or cleaning of your Model 501 Mono Amplifier please contact your dealer or the J RDG factory before attempting to cle
13. ve spade terminal to the negative binding post Secure the loudspeaker connections by tightening the knob securely with your fingers The Model 501 will only accept spade termi nated loudspeaker cables Banana plugs or bare wire connections can be used but require an optional clamp available from your J RDG Dealer 4 AC INPUT CONNECTOR Verify thatthe VOLTS AC input identified on the rear panel near the AC input socket is the same as the AC mains voltage in your area If the voltage does not match DO NOT CONNECT THE AMPLIFIER TO AC POWER and contact your dealer immediately Install the AC Power Cable between the AC input connector and your AC mains outlet 5 MASTER AC POWER SWITCH This switch controls the operating status of the amplifier Pressing the I symbol on the switch will turn the amplifier ON Pressing the O symbol on the switch will turn the amplifier OFF JEFF ROWLAND DESIGN GROUP 2007 ALL RIGHTS RESERVED WARNING Both positive and negative outputs are electrically active with respect to chassis and or system ground potential Therefore this amplifier cannot be used in certain loudspeaker switching configurations such as those used in retail demonstrations Failure to avoid these precautions may short the outputs to ground and can result in damage to the amplifier and will void the warranty Certain subwoofer speakers which derive signals from amplifier outputs will require additional circuitry to pro
14. with no fear of overheating The efficient and compact design of the Model 501 allows itto be installed in any number of music film and surround sound systems For connection instructions for use in a typical two channel stereo system please see page 11 of this manual The main chassis of the Model 501 is precision machined out of a solid block of aluminum to create as rigid an enclosure as possible impervious to lateral and torsional forces The amplifier is particularly non resonant however various damping and resonance control accessories may be used to yield greater audio performance in some audio systems RISK OF ELECTRICAL SHOCK WARNING Do not attempt to access the interior of the MODEL 501 MONO AMPLIFIER by removing the bottom cover Doing so will void your warranty and could expose you to dangerous potentially lethal electrical voltages 8 PO BOX 7231 COLORADO SPRINGS COLORADO 80933 USA E MAIL JRDG JEFFROWLAND COM WWW JEFFROWLAND COM TELEPHONE 719 473 1181 The J RDG Model 501 Mono Amplifier has been designed to operate at the highest level of efficiency and performance in any normal operating situation however there are a few impor tant use and care principles that must be keptin mind when operating the amplifier Do not expose the amplifier to rain moisture or excessively damp conditions Make sure that the voltage on the backside of the panel matches the mains voltage in your area The Model
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