Jeff Rowland Design Group Model 2 User's Manual
Contents
1. 4 A REMOTE connector DIN 5 pin is provided on the rear panel for remotely switching the Amplifier between operational and standby modes The pin connections on this connector parallel the electrical contacts of the FRONT PANEL STANDBY POWER button and lamp An optional wired remote switch or infrared wireless remote sensor can be plugged into the REMOTE connector to facilitate this function Contact your dealer or Jeff Rowland Design Group for further information and availability of this feature Signal Connections The Model 2 amplifier offers unprecedented compatibility with associated audio components When connecting or disconnecting speaker or interconnect cables it is only necessary that the FRONT PANEL STANDBY POWER button be pressed to switch the amplifier to standby mode The button will not be illuminated in this mode 1 When installing the interconnect cables a slight click may be heard when the XLR interconnect plugs are installed correctly and latched The latch located on the input connector and labeled PUSH must be pressed to remove the XLR interconnect cable 2 When using RCA unbalanced interconnects from your preamplifier or other source component install the supplied XLR RCA adapters into both XLR input connectors The Amplifier will still operate in the fully balanced Differential Mode configuration 3 Unscrew RIGHT CHANNEL OUTPUT and LEFT CHANNEL OUTPUT connectors and install the positive and negative loud2. Condition FRONT PANEL STANDBY POWER button illuminates normally but RIGHT LEFT or both Amplifier CHANNELS do no operate or warm up to normal operating temperature AC MAINS CIRCUIT BREAKER rear panel switches off or will not remain on 50 60 Hz hum noise in loudspeakers High frequency random or scratching noise in loudspeakers Basic Troubleshooting you have any additional questions regarding installation or operation please contact your authorized Jeff Rowland Design Group Dealer
3. input muting under anomalous input or output operating conditions Balanced Differential Mode circuit topology implemented from input to output Plug in modules containing critical electronic circuitry enhance thermal stability mechanical integrity and serviceability Low resonance structurally integrated chassis of precision machined aluminum alloy components Product Features XLR Balanced Input jacks for balanced Differential Mode system configurations XLR to RCA Input adapters included User selectable overall gain of 26 or 32 dB User selectable input impedance of 36kQ HD or 6000 LO All internal signal circuitry is totally isolated from chassis and system eround potentials to eliminate noisy ground loops and to provide extreme immunity from RF interference Optional remote wired or wireless power ON OFF switching Automatic temperature stabilizing circuitry maintains constant operating temperature Standby power condition reduces warm up time Fail safe operation provided by user resetable AC circuit breaker located on rear panel vv y 7y Introduction Product Features Contents Contents Ensure that all of the auxiliary components listed below are enclosed within the accessory box Refer to the diagrams illustrated above and verify the components included AC power cable Two 2 XLR RCA adapters Four 4 spiked coupling interface supports Four 4 compliant isolation interface supports O
4. when the output impedance of the preamplifier 600 balanced matches the input impedance of the power Amplifier 6000 balanced When the impedances are matched maximum signal power transfer and signal fidelity are achieved in addition to the advantage of utilization of long lengths 10 meters and ereater of interconnect between components with no sonic degradation However there will be a 6 dB decrease in volume relative to a mismatched condition low driving source impedance driving high load Amplifier input impedance If there is any doubt as to the compatibility of the above mentioned components then HIGH INPUT IMPEDANCE should be selected Since the electrical performance of the Model 2 is not changed when selecting different INPUT IMPEDANCE options apparent differences in sonic quality can be attributed to mismatched impedances Due to different sensitivities of associated equipment used with the Model 2 the OVERALL GAIN switch can be used to optimize the total gain structure of the entire system This allows the volume control of your preamp to be used in an ideal mid range position Operation After following the procedures outlined in the Installation Rear Panel Power Connections and Signal Connections sections the Amplifier can be turned on by pressing the FRONT PANEL STANDBY POWER button Allow approximately twenty 20 minutes for the amplifier to reach operating temperature and maximum performance potential A short warm
5. Miele Stereo Power Amplifier Owner s Manual Introduction VVelcome to the Jeff Rowland Design Group family and congratulations on your purchase of what is unquestionably Jeff Rowland Design Group Inc one of the world s finest audio power amplifiers With its combination of industrial grade active and passive devices 2911 North Prospect Street precision electronic circuitry and accurately machined chassis components throughout your Model 2 Amplifier will offer Colorado Springs CO 80907 you many years of musically satisfying enjoyment Please take a few moments to read the remainder of this Owner s Phone 719 473 1181 Manual A thorough understanding of the operational features will allow you to gain the maximum performance and Fax 719 633 4158 ease of use for which this Amplifier was designed Please note that your Model 2 Stereo Amplifier serial number begins with the letter A This number is recorded below and is also located on the rear panel of the chassis Please include this number with any correspondence regarding your Model 2 Amplifier It has been my joy to create an audio component of enduring value which will reflect a higher ideal of musical and artistic expression It is my hope that these qualities will enrich your experience of ownership Enjoy the music Jeff Rowland President Quiet transient free operation during power and function mode switching Automatic
6. decoupling of the Amplifier chassis to the supporting structure As a general rule most installations allow the Amplifier chassis to be rigidly coupled to the supporting structure via the spiked coupling interface supports In carpeted installations these supports provide excellent coupling from the Amplifier chassis to the rigid supporting structure below In installations where the integrity of the supporting structure is poor the Amplifier chassis can be loosely coupled to the supporting structure via the compliant isolation interface supports This will help attenuate the transfer of spurious energy from the supporting structure into the Amplifier chassis Note Another installation option when incorporating the optional Battery Power Source utilizes its chassis as a stable high mass structural support for the Amplifier chassis In this configuration the Battery Power Source chassis is rigidly coupled to the supporting structure via the spiked coupling interface supports and the Amplifier is placed directly above the Battery Power Source and isolated via the compliant isolation interface supports If desired a coin may be placed directly under the point of the spiked coupling support to prevent damage to various surfaces i e hardwood floors Installation Rear Panel Power Connections Signal Connections ouTPUT ati 5 0000 SE 0 weer B a Ga O K N rab os Ko 26 A E 4 Remote
7. he right to change or modify product specifications without notice or obligation Specifications 75 watts 150 watts 0 1 Hz to 160 kHz 3 dB 80 volts per microsecond Less than 0 05 at rated power Greater than 100 20 Hz to 20 kHz 8 ohms 20 amps continuous 35 amps peak User selectable on rear panel 26 dB or 32 dB 141 mV or 71 mV User selectable on rear panel 36k or 600 ohms 36k or 600 ohms Greater than 60 dB 20 Hz to 20 kHz Performance Output Power Continuous RMS watts 8 ohms 4 ohms Power Bandwidth Slew Rate THD and Noise Damping Factor Output Current Overall Gain S Sensitivity 1 watt 8 ohms Input Impedance Unbalanced Balanced Common Mode Rejection Ratio Operation Specifications Basic Troubleshooting A summary of fault conditions their causes and remedies are listed below The Model 2 Amplifier can produce high power levels which without well designed protection circuitry could damage loudspeakers Therefore most fault Remedy Remove STANDBY POWER button from front panel and replace bulb located under button Use replacement bulb kit and instructions supplied by JRDG Review Installation Rear Panel Power Connections section Reset CIRCUIT BREAKER on amplifier rear panel Consult dealer or JRDG Repair or replace source component preamplifier Identify and correct abnormal conditions such as low frequency rumble and or acoustic feedback caused by phono playbac
8. k components if applicable Reduce volume slightly or use higher efficiency loudspeakers Cause Light bulb defective Incorrect power connections or AC MAINS CIRCUIT BREAKER on Amplifier rear panel is tripped Abnormal operation of Model 2 Amplifier internal circuitry Excessive sub sonic signals produced by source components Severe clipping of Amplifier circuitry under intermittent overload conditions conditions which may occur during use will be indicated by the Model 2 reverting to a standby condition JRDG Jeff Rowland Design Group Inc Condition FRONT PANEL STANDBY POWER button lamp does not illuminate after pressing although the Amplifier operates normally FRONT PANEL STANDBY POWER button lamp does not illuminate after pressing and Amplifier does not operate normally FRONT PANEL STANDBY POWER button reverts to standby condition during listening but can be returned to operational condition Remedy Consult dealer or JRDG Reconfigure Amplifier to proper AC mains voltage operation Consult dealer or JRDG Reorient or increase distance between source component and Amplifier Insert compensation network on Amplifier OUTPUT connector s available from JRDG Cause Internal DC fuses defective AC mains service voltage too high for Amplifier Sensitive source component s located too close to Amplifier Unstable conditions created by excessive capacitance in loudspeaker cables
9. ne 1 speaker terminal hand wrench 7 16 inch O 0 AQ One 1 warranty card in some countries warranties are provided by the respective importer Initial Inspection Inspect the shipping container for damage If the shipping container packing material amplifier or accessories are damaged or missing notify your dealer and the shipper if a claim is to be made Note Many shippers require notification and an inspection within twenty four 24 hours of delivery to ascertain the nature of damages incurred Your Model 2 Amplifier has undergone extensive performance evaluations listening tests quality control inspections and a minimum seventy two 72 hour burn in period prior to shipment and should be in a perfect operational condition upon receipt If the Amplifier does not operate correctly please notify your dealer immediately We strongly suggest that you save all packing materials If the Amplifier is returned to your dealer or Jeff Rowland Design Group the original packing materials must be used for shipment Neither Jeff Rowland Design Group nor the shipper can be held responsible for damages incurred during transit if the original factory packing is not used All factory returns require that a Return Authorization number be issued by Jeff Rowland Design Group prior to shipment Initial Inspection Contents Front Rear Panel Function Controls Front Rear Panel Function Controls Before attempting any s
10. ng your Model 2 Amplifier Verify that the supplied connector jumper and cover are installed correctly to the JUMPER BPS 2 CONNECTOR This connector jumper can serve as an interlock to prevent unauthorized operation of the amplifier when not in place When using the companion BPS 2 Battery Power Source this connector jumper must be removed and the BPS 2 DC power cable must be installed in its place Verify that the VOLTS 50 60 Hz INPUT identified on the rear panel corresponds to the AC mains voltage of your service area Install the AC power cable between the Amplifier and an active AC mains outlet The Model 2 Amplifier is convection cooled eliminating the need for fan or 1 forced air cooling When operating the chassis should have at least two 2 inches of air space around the heatsink areas Multiple chassis can be stacked vertically thus facilitating an upward flow of warm air currents throughout the vertical heatsink fin areas This upward flow must not be impeded or recirculated around the chassis if proper cooling is to be maintained Supplied with your Model 2 Amplifier are two different support systems 2 An assessment of the supporting structure should be made to determine the proper system for the Amplifier Both spiked and compliant interface supports can be easily installed within the indentations on each of the four chassis pods located underneath the corners of the chassis These system options permit the coupling or
11. speaker cable spade terminals to the respective Amplifier OUTPUT Red is normally positive black is normally negative ALWAYS USE THE SUPPLIED SPEAKER TERMINAL HAND WRENCH WHEN CONNECTING OR DISCONNECTING LOUDSPEAKER CABLES DO NOT OVERTIGHTEN THESE TERMINALS A WARNING Both positive and negative OUTPUTS of both channels are electrically active with respect to chassis and or system eround potential It is important that both of these outputs are electrically isolated from system ground potential This precludes the use of this Amplifier in certain loudspeaker switching configurations sometimes used in retail demonstrations and testing or servicing situations where either positive or negative outputs can be connected to ground potentials Failure to observe these precautions may result in damage to the Amplifier and may void your warranty Consult the factory first if the Amplifier is to be used under these conditions Signal Connections To achieve the maximum performance for which this Amplifier was designed it is recommended that balanced signal source INPUT and LOW INPUT IMPEDANCE options are used This condition requires that the driving source component preamplifier is equipped with balanced outputs and sufficient output current to properly drive the input of the Model 2 when the LOW INPUT IMPEDANCE option is selected Most high quality solid state pream plifiers can satisfy these conditions and best results are obtained
12. up time is dependent upon the amplifier being plugged in to an active AC mains power source for at least two hours prior to activating the FRONT PANEL STANDBY POWER button Therefore it is recommended that the Amplifier be continuously connected to an active AC mains power source If you desire to disconnect the AC mains for an extended period of time simply disconnect the AC power cable from the wall outlet and reconnect upon your return Slight transients may be heard in the loudspeakers during the AC mains connect disconnect transitions Your new Model 2 Amplifier will require an initial break in period of at least eighty 80 hours before maximum performance can be expected Efficient break in procedures require the Amplifier to be fully operational playing music Continuous and noticeable performance improvements will occur during subsequent months of operation 25 watts standby 175 watts operating idle 400 watts maximum User selectable on rear panel With supplied XLR RCA adapter 2 XLR connectors 1 pair binding posts per channel 17 5 in W x 14 25 in D x 5 25 in H 445 cm W x 30 2 cm Dx 13 3 cm 1 24 in W x 20 in Dx 12 in H 61 cm W x 50 8 cm D x 30 5 cm H 47 lbs 21 5 kg 75 Ibs 34 0 kg Power Consumption Inputs Unbalanced Balanced Outputs Dimensions Shipping Dimensions Weight Shipping Weight Because Jeff Rowland Design Group is constantly analyzing new design improvements we reserve t
13. ystem interconnection please familiarize yourself with the front and rear panel controls of the Model 2 Amplifier The descriptions below refer to the numbers associated with the features in the diagram above Front Panel A FRONT PANEL STANDBY POWER button Press to operate Amplifier in standby mode This button will illuminate when the Amplifier is operational When the button is not illuminated all Amplifier inputs are muted and internal circuitry is reverted to power saving standby mode Note All ON OFF power switching should be initiated ONLY with this button Anomalous operating conditions will automatically switch the Amplifier off no illumination and will prevent the Amplifier from being switched back on again until such a condition is eliminated Rear Panel Note The switches described below can be switched if desired while the Amplifier is operational and playing music 1 INPUT IMPEDANCE switch This switch selects between a high 36KQ or low 6000 input impedance 2 OVERALL GAIN switch This switch selects between a high 32 dB or normal 26 dB overall gain structure of the Amplifier Front Rear Panel Function Controls Rear Panel Power Connections Installation Rear Panel Power Connections L ocate the Amplifier as close as possible to its final installation point Important Please strictly follow the steps in order as outlined below Allow access to the rear panel for making connections before operati
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