Jeff Rowland Design Group 302 User Manual

Model 302

Stereo Power Amplifier

Owner’s Manual

Table of ContentsTable of Contents

Introduction.......................................................................................................................................4

Product Features...............................................................................................................................5

Initial Inspection.................................................................................................................................7

Package Contents.............................................................................................................................7

Unpacking the Amplifier.....................................................................................................................9

Maintenance, Cleaning, and Protection..........................................................................................11

Installation, Use, and Care...............................................................................................................12

Front Panel Functions and Indicators...............................................................................................15

Rear Panel Power Connections........................................................................................................17

Rear Panel Signal Connections........................................................................................................19

Internal Adjustments........................................................................................................................20

Specifications..................................................................................................................................21

Dimensions......................................................................................................................22

Additional and Contact Information................................................................................................23

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IntroductionIntroduction

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. Please take a few minutes to

read the remainder of this Owner's Manual before proceeding with the installation of the amplifier. A

thorough understanding of the operational features will allow you to gain the maximum performance

and ease of use for which this amplifier was designed. Please note that your Model 302 Stereo

Amplifier serial number begins with the letter “T.” 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 302 Stereo Amplifier. It has been my joy to create an audio component of enduring value that

reflects the higher ideals of musical and artistic expression. It is my hope that these qualities will enrich

your experience of ownership.

Enjoy the music!

Jeff Rowland

President,

Jeff Rowland Design Group

P.O. Box 7231 Colorado Springs, Colorado 80933

Tel: 719-473-1881 Fax: 719-633-4158 E-mail: jrdg@jeffrowland.com Web: www.jeffrowland.com

Tel: 719-473-1881 Fax: 719-633-4158 E-mail: jrdg@jeffrowland .com Web: www .jeffrowland.com

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Product FeaturesProduct 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.

! Fully-balanced circuit topology implemented from input to output.

! Power Factor correction in power supply reduces AC line harmonic noise pollution and increases

AC line power utilization to 99%.

! Proprietary switch-mode power supply technology ensures consistent performance under all

operating conditions.

! 12V remote ON/OFF remote power switching via 1/8” jack on rear panel.

! CE approved speaker output terminals require no tools for secure, low resistance connections.

! Standby power mode reduces warm-up time.

! Fail-safe operation provided by user-resetable thermal circuit breaker located on rear panel.

! Quiet, transient-free operation during power ON/OFF and input configuration switching.

! Selectable overall gain of 26 or 32 dB.

! Ultra-low resonance, structurally rigid chassis constructed of precision-machined aircraft grade

6061-T6 aluminum.

! 3-point self-leveling chassis support.

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Package ContentsPackage Contents

AC Power CableAC Power Cable

CareCare

Care and Maintenance

Instruction Card

Compliant Isolation

Pads

WARRANTY REGISTRATIONWARRANTY REGISTRATION

Warranty CardWarranty Card

Owner’s ManualOwner’s Manual

Model 302 Stereo Power AmplifierModel 302 Stereo Power Amplifier

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Initial InspectionInitial 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)

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

immediately. Note: Many shippers require notification and inspection within twenty-four hours of

delivery to determine the nature of damages incurred.

Your Model 302 Stereo Power Amplifier has undergone extensive performance evaluations, listening

Your Model 302 Stereo Power Amplifier has undergone extensive performance evaluations, listening tests, quality control inspections, and a minimum seventy-two hour burn-in period prior to shipment

tests, quality control inspections, and a minimum seventy-two hour burn-in period prior to shipment and should therefore be in perfect operating condition upon receipt. If the amplifier does not

and should therefore be in perfect operating condition upon receipt. If the amplifier does not operate correctly, please notify your dealer immediately.

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

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 to avoid damage.

Rowland Design Group, the original packing materials must be used for shipment to avoid damage. Neither Jeff Rowland Design Group nor the shipper can be held responsible for damages incurred

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 Jeff Rowland

during transit if the original factory packing is not used. All factory returns require that Jeff Rowland Design Group issue a Return Authorization (RA) number prior to shipment.

Design Group issue a Return Authorization (RA) number prior to shipment.

ContentsContents

Ensure that all of the auxiliary components listed below are enclosed within the shipping carton and

accessory box. Refer to the diagrams illustrated on the adjacent page and verify that the proper

accessory box. Refer to the diagrams illustrated on the adjacent page and verify that the proper components are included.

components are included.

1 One (1) AC Power Cable

2 One (1) Warranty Card (In some countries, warranties are provided by the respective importer.)

3 One (1) Care and Maintenance Instruction Card

4 One set of three (3) Compliant Isolation Pads

5 One (1) Owner’s Manual

6 One (1) Model 302 Stereo Power Amplifier

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Unpacking the AmplifierUnpacking the Amplifier

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Jeff Rowland Design Group 302 User Manual

Specifications and Main Features

Frequently Asked Questions

User Manual