Model 302 Stereo Power Amplifier Owner’s Manual
Table of Contents Introduction.......................................................................................................................................4 Product Features...............................................................................................................................5 Initial Inspection.................................................................................................................................7 Package Contents..................................
Introduction Welcome to the Jeff Rowland Design Group “family ” and congratulations on your purchase of what is unquestionably one of the world's finest audio power amplifiers. With its combination of features such as numerous function control and interconnect possibilities, precision electronic circuitry, exceptional efficiency, and accurately machined chassis components throughout, your Model 302 Stereo Power Amplifier will offer you many years of musically satisfying enjoyment.
Product Features ! XLR input connectors for balanced system configuration. ! RCA input connectors for unbalanced system configurations. ! Dual Speaker Output Terminals on each channel for bi-wiring applications. ! User selectable switching between balanced and unbalanced connections. ! Transformer coupled inputs provide universal compatibility with other components and eliminate ground loop noise and EMI. ! Ultra-high efficiency output section generates high power output with very little heat.
Package Contents WARRANTY REGISTRATION Compliant Isolation Pads AC Power Cable Warranty Card Care Care and Maintenance Instruction Card Owner’s Manual Model 302 Stereo Power Amplifier 6
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) immediately. Note: Many shippers require notification and inspection within twenty-four hours of delivery to determine the nature of damages incurred.
Unpacking the Amplifier 1 2 4 3 5 8
Unpacking the Amplifier Amplifier The Model 302 is a large and heavy amplifier. Due caution should be taken when unpacking and installing the amplifier to avoid injury or damage to the amplifier. The Model 302 should be unpacked by at least two people, however it is possible for one person to unpack the amplifier safely. There should be a portion of carpet or soft, padded cloth to stand the amplifier on when unpacking it from the shipping box.
Amplifier Maintenance, Cleaning, and Protection 10
Amplifier Maintenance, Cleaning, and Protection Maintenance and Cleaning All Jeff Rowland Design Group products are designed to provide a lifetime of enjoyment and listening pleasure. The chassis is sealed to prevent dust from entering and the interior of the chassis should not need cleaning during the lifetime of the product. All internal circuitr y is self-adjusting such that no adjustments or maintenance of any kind are necessary over the lifetime of the product.
Amplifier Installation, Use, and Care Locate the amplifier as close as possible to its final installation point. Allow access to the rear panel for making connections. The Model 302 Stereo Power Amplifier is extremely efficient and convection cooled, eliminating the need for fans or forced-air cooling. Multiple chassis can be stacked vertically, facilitating an upward flow of warm air currents throughout the vertical heatsink areas.
Amplifier Installation, Use, Use,and andCare Care(Cont.) (Cont.) ! ! ! When operating the Model 302, 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. The output terminals or loudspeaker cables should never be shorted to each other or to ground. Shorting of the outputs will result in damage to the output section.
Amplifier Front Panel Functions and Indicators Front Panel Power/Standby Button 14 Front Panel Power/Standby Indicator
Amplifier Front Panel Functions and Indicators Before attempting any system interconnection, please familiarize yourself with the front panel control of the Model 302 Stereo Power Amplifier. The descriptions below refer to the illustration on the adjacent page. FRONT PANEL STANDBY/POWER BUTTON: Press this button to operate the amplifier. Press again to place the amplifier in Standby mode. FRONT PANEL STANDBY/POWER INDICATOR: This small, blue light will illuminate when the amplifier is operational.
Amplifier Rear Panel Power Connections UNBALANCED INPUT UNBALANCED INPUT RIGHT INPUT SELECT LEFT INPUT SELECT NEUTRIK NEUTRIK PUSH PUSH BALANCED INPUT BALANCED INPUT MODEL 302 302 STEREO POWER AMPLIFIER MADE A RIGHT SPEAKER OUTPUT B IN .U.S.A LEFT SPEAKER OUTPUT A 1200 W. MAX B VOLTS AC SERIAL NUMBER T0000 AC MAINS PUSH TO RESET REMOTE ON / OFF OFF 12V 5 A M P CAUTION TO PREVENT FIRE OR SHOCK HAZARD, DO NOT REMOVE COVER. DO NOT EXPOSE TO RAIN OR MOISTURE.
Amplifier Rear Panel Power Connections Important: Please strictly follow the following steps outlined below in order before operating your Model 302 Stereo Power Amplifier. K Verify that the 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. L Verify that the AC MAINS circuit breaker is closed (no white area visible on breaker).
Amplifier Rear Panel Signal Connections 2 1 3 UNBALANCED INPUT UNBALANCED INPUT RIGHT INPUT SELECT LEFT INPUT SELECT NEUTRIK NEUTRIK PUSH PUSH BALANCED INPUT BALANCED INPUT MODEL 302 STEREO POWER AMPLIFIER MADE IN U.S.A. A RIGHT SPEAKER OUTPUT B 1200 W. MAX LEFT SPEAKER OUTPUT A B VOLTS AC REMOTE ON / OFF 12V SERIAL NUMBER T0000 AC MAINS PUSH TO RESET CAUTION TO PREVENT FIRE OR SHOCK HAZARD, DO NOT REMOVE COVER. DO NOT EXPOSE TO RAIN OR MOISTURE. NO USER SERVICEABLE PARTS INSIDE.
Amplifier Rear Panel Signal Connections The Model 302 Stereo Power Amplifier offers unprecedented compatibility with associated audio components. When connecting or disconnecting speaker or interconnect cables, the amplifier should be placed in Standby mode (blue POWER INDICATOR LED on the front panel OFF). If you are using balanced XLR interconnects from your preamplifier or source component, position the INPUT SELECT switch (1) to BALANCED INPUT.
Internal Adjustments Overall Gain The overall gain of the Model 302 Stereo Power Amplifier can be adjusted between 26 dB and 32 dB. The setting from the factory is 26 dB, which is adequate for the majority of applications, though some systems involving low efficiency loudspeakers may require the higher gain setting. There is no sonic difference between the two settings.
Model 302 Stereo Power Amplifier Specifications Output Power: Continuous RMS watts, both channels driven @ 8 ohms @ 4 ohms 300 watts. 500 watts. Power Bandwidth: 5 Hz - 60 kHz, -3 dB. Peak Output Current: >45 Amps. Dynamic Range: 117 dBA. THD + Noise, 0.1W-500W/4 ohm: <.05%, typically .006 @ 1kHz. CCIF Intermodulation Distortion, 19/20 kHz: <.002%. Damping Factor @ 1kHz: 275. Overall Gain: (Balanced or Unbalanced) Selectable Internal Jumper, 26 or 32 dB. Input Impedance: 40k ohms.
Dimensions A summary summary of ofthe theamplifier amplifierchassis chassisdimensions dimensions is indicated is indicated below. below. 18.3 in. (46.9 cm) 10.0 in. (25.4 cm) 14.5 in. (36.8 cm) 15.5 in. (39.4 cm) 16.0 in. (40.6 cm) 10.6 in. (26.
Additional Information If you have any additional questions regarding the installation or operation of the Model 302 Stereo Power Amplifier, please contact your authorized Jeff Rowland Design Group dealer or check the Jeff Rowland Design Group web site at http://www.jeffrowland.com.
