Model 12 Model 12 Mono Power Amplifier Mono Power Amplifier Owner’s Manual Owner’s Manual
Introduction W elcome to the Jeff Rowland Design Group “family” and congratulations on your purchase of what is J eff Rowland Design Group, Inc. unquestionably one of the world’s finest audio power amplifiers.
Product Features • XLR input connectors for balanced (Differential Mode) system • Automatic bias adjustment maintains optimal bias setting regardless of source material or loudspeaker load. configuration. • RCA input connectors for unbalanced system configurations. • Standby power condition reduces warm-up time. • Selectable overall gain of 26 or 32 dB.
Contents Model 12 Amplifier Section Model 12 Power Supply DC Power Supply Cable AC Power Cable Warranty Card
Initial Inspection Contents I nspect E nsure that all of the auxiliary components listed below are enclosed 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 ascertain the nature of damages incurred.
Care, Cleaning, and Maintenance
Care T he Model 12 Mono Power Amplifier is finely constructed from pieces of solid aluminum. The surface of the unit is cut in a unique process that uses a diamond tipped blade. This process was refined over many years to produce an artistic and attractive finish. The front, top, bottom and side panels are then finished with fine automobile polyurethane clear coat after a light anodizing to preserve the clarity of the finish and are not raw or exposed metal. based furniture wax or polish.
Amplifier Front and Rear Panel Function Controls Amplifier Front Panel Standby/Power Button Power Indicator LED Amplifier Rear Panel NEUTRIK PUSH NEUTRIK Input Select Switch
Amplifier Front and Rear Panel Function Controls Controls B efore attempting any system interconnection, please familiarize yourself with the front and rear panel controls of the Model 12 Mono Power Amplifier. The descriptions below refer to the diagrams above. Front Panel Rear Panel 1 FRONT PANEL STANDBY/POWER BUTTON: Press this button to (Note: If desired, the switch described below can be switched while the amplifier is operational and playing music.) operate the amplifier.
Rear Panel Power Connections Amplifier Rear Panel NEUTRIK PUSH NEUTRIK DC Power Supply Cable Connector Volts AC Indicator Power Supply Rear Panel AC Power Cable Connector
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. The Model 12 Mono Power Amplifier is convection cooled, eliminating the need for fan or forced-air cooling. When operating, the chassis should have at least two (2) inches of air space around the heatsink areas.
Signal Connections and Remote Input Select Switch Amplifier Rear Panel NEUTRIK 12V Remote Connector PUSH NEUTRIK Balanced Input Connector Parallel Input Connector Power Supply Rear Panel Speaker Output
Signal Connections and Remote T he Model 12 Mono Power Amplifier offers unprecedented compatibility with associated audio components. When Connecting or disconnecting speaker or interconnect cables, it is necessary to place the amplifier in Standby mode (orange POWER INDICATOR LED on the front panel OFF). 1 If you are using balanced XLR interconnects from your preamplifier or source component, position the INPUT SELECT switch to BALANCED INPUT.
Parallel Connection Diagram 0.5 Meter XLR Interconnect NEUTRIK PUSH NEUTRIK XLR Interconnect from Preamp Output NEUTRIK PUSH NEUTRIK + and – Speaker Wire Outputs to Loudspeakers 0.5 Meter Speaker Cable Jumper from + to + 0.
Parallel Connection Instructions The Model 12 Mono Power Amplifier provides 200 watts of audio output power, sufficient to drive nearly any loudspeaker. In a few instances, there may be a need for more output current in order to drive a very low impedance or current demanding loudspeaker.
Internal Function Controls Overall Gain DC Protection System T he overall gain of the Model 12 Mono 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 in a small number of situations involving low efficiency systems the higher gain setting may be necessary. There is no sonic difference between the two settings.
Model 12 Mono Power Amplifier Specifications Power Consumption: 100 watts idle, 530 watts maximum Driven at Full Output Power Inputs: User Selectable, Balanced XLR Unbalanced RCA 30 volts/microsecond Outputs: One Pair Binding Posts THD + Noise: <.008% Amplifier Section Dimensions: 17.5” W x 11.7” D x 3.1” H 44.5cm W x 33.5cm D x 6.5cm H Damping Factor: >100, 20 to 20 kHz Amplifier Section Weight: Gain (1 watt, 8 ohms): User Selectable Internal Jumper, 26 dB or 32 dB 30 lbs. 13.
Basic Troubleshooting A summary of fault conditions and their causes and remedies are listed below. The Model 12 Mono Power Amplifier can produce high power levels that, without well-designed protection circuitry, could damage loudspeakers. Therefore, most fault conditions will result in the Model 12 reverting into Standby Mode.
Additional Information I f you have any additional questions regarding the installation or operation of the Model 12 Mono 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.
Post Office Box 7231 Colorado Springs, Colorado 80933 USA
