JEFF ROWLAND CONCERTO User manual

OWNER’S MANUAL CONCERTO STEREO PREamPlifiER

TABLE OF CONTENTS

OWNER’S MANUAL CONCERTO STEREO PREAMPLIFIER

Introduction 2

Product Features 3

Package Contents 4

Initial Inspection 5

Maintenance & Cleaning 6-7

Protection Systems 7

Installation, Use & Care 8-9

Remote Transmitter Operation 10-11

Front Panel Functions 12-13

Rear Panel Signal Connections 14-15

Rear Panel Power Connections 16-17

Specications 18

Dimensions 19

Optional Adjustments 20-25

PO BOX 7231, COLORADO SPRINGS, COLORADO 80933 USA E-mAIL: jRDG@jEffROwLAND.COm www.jEffROwLAND.COm TELEPHONE (719) 473-1181

If you have any additional questions

regarding the installation or operation

of the CONCERTO Stereo Preampliﬁer,

please contact your authorized Jeff

Rowland Design Group dealer or check

the Jeff Rowland Design Group web site

at www.jeffrowland.com.

Enjoy the music!

Jeff Rowland

President,

Jeff Rowland Design Group

CONCERTO

Stereo Preampliﬁer. 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 CONCERTO

Stereo Preampliﬁer serial number begins

with the letters “PA.” This serial number is

located on the rear panel of the chassis.

Please include this number with any corre-

spondence regarding your CONCERTO

Stereo Preampliﬁer. 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.

Welcome to the Jeff Rowland Design

Group “family” and congratulations on your

purchase of what is unquestionably one

of the world’s ﬁnest preampliﬁers. With its

combination of features such as numerous

function control and interconnect possi-

bilities, system conﬁguration ﬂexibility,

precision electronic circuitry, exceptional

efﬁciency, and accurately machined chassis

components throughout, your CONCERTO

Stereo Preampliﬁer 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

INTRODUCTION

OWNER’S MANUAL CONCERTO STEREO PREAMPLIFIER

• Two pairs XLR input connectors for

balanced system congurations.

• Three pairs RCA input connectors for

unbalanced system congurations.

• Two pairs of parallel, high-current,

balanced line level preamplier outputs

to allow driving of external ampliers,

subwoofers, zones, etc.

• Fully-balanced transformer-coupled

inputs provide

universal compatibility

with other

components and eliminate

ground loop noise and EMI.

• Fully-balanced circuit topology

implemented on all inputs and outputs.

• Bypass function allows for transpar-

ent use in combination audio/home

theater systems.

• Regulated, high-current, linear power

supply provides stable operating volt-

age with the lowest possible noise and

distortion artifacts under all operating

and line conditions.

• Low power consumption permits

constant power-up operation to

eliminate warm-up time.

• Optical encoder type volume control

maintains quiet, trouble-free perfor-

mance and accuracy over the entire

lifetime of the product.

• Dual range volume control allows

large volume level changes when

knob is rotated abruptly, yet allows

small, precise volume level changes

when knob is rotated slowly.

• Six function, hand-held infrared

remote transmitter.

• Ultra-low resonance, structurally

rigid chassis,

precision-machined

from a solid block of aircraft grade

6061-T6 aluminum.

• Optional plug-in phono cards

(installed internally) convert Line

Input 2 to high performance phono

inputs. Three gain and loading

options can accommodate moving

magnet (MM), moving coil (MC)

cartridge types and high output

moving coil cartridge types.

PRODUCT FEATURES

OWNER’S MANUAL CONCERTO STEREO PREAMPLIFIER

PO BOX 7231, COLORADO SPRINGS, COLORADO 80933 USA E-mAIL: jRDG@jEffROwLAND.COm www.jEffROwLAND.COm TELEPHONE (719) 473-1181

PACKAGE CONTENTS

OWNER’S MANUAL CONCERTO STEREO PREAMPLIFIER

WARRANTY REGISTRATION

WARRANTY CARD

INPUT

MUTE

BAL L

BAL R

VOL

AC POWER CABLE

REMOTE TRANSMITTER OWNER’S MANUAL

CONCERTO STEREO PREAMPLIFIER

Inspect the shipping container for damage. If any portion of the shipping container, packing material,

preampliﬁer, or accessories are damaged or missing, notify your dealer and the shipper (if a claim

is to be made) immediately.

NOTE:

Many shippers require notication and inspection within 24 hours of delivery to determine the nature of damages incurred.

Your CONCERTO Stereo Preampliﬁer 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 preampliﬁer does not operate correctly,

please notify your dealer immediately.

We strongly suggest that you save all of the packing materials. If the preampliﬁer is returned to your

dealer or JRDG, the original packing materials must be used for shipment to avoid possible damage.

Neither JRDG 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 JRDG issue a Return Authorization

(RA) number prior to shipment.

INITIAL INSPECTION

OWNER’S MANUAL CONCERTO STEREO PREAMPLIFIER

PO BOX 7231, COLORADO SPRINGS, COLORADO 80933 USA E-mAIL: jRDG@jEffROwLAND.COm www.jEffROwLAND.COm TELEPHONE (719) 473-1181

All JRDG products are designed to provide

a lifetime of enjoyment

and listening pleasure. The CONCERTO Stereo Preampliﬁer 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

that incorporates a diamond tipped cutting tool. This process was reﬁned

over many years to produce an attractive 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.

• Please allow the front panel, which is coated with an automotive-grade polyure-

thane nish, 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 ne oil-based furniture polish. Because of the

ne nish of the front panel, use of any other cleaning agent may permanently

scratch the nish.

• The top cover, sides and bottom are protected by a durable black anodized nish

and can be cleaned with a soft cotton cloth (such as an optical lens cleaning cloth

or ne 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.

Maintenance & cleaning

OWNER’S MANUAL CONCERTO STEREO PREAMPLIFIER

Protection SyStemS

The CONCERTO Stereo Preampliﬁer 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 pream-

pliﬁer will not be used for extended periods of time, the preampliﬁer

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.

If you have any questions about the care or cleaning of your

CONCERTO Stereo Preampliﬁer, please contact your dealer or the

JRDG factory before attempting to clean the chassis. The use of a

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.

PO BOX 7231, COLORADO SPRINGS, COLORADO 80933 USA E-mAIL: jRDG@jEffROwLAND.COm www.jEffROwLAND.COm TELEPHONE (719) 473-1181

Locate the preampliﬁer as close as possible to its ﬁnal installation point. Allow access to the rear

panel for making connections. Due to it’s design, the CONCERTO Stereo Preampliﬁer is energy

efﬁcient, eliminating the need for heatsinks or forced-air cooling. As a result, the

CONCERTO

Stereo Preampliﬁer can be housed in a cabinet or custom enclosure with no fear of overheating.

The efﬁcient and compact design of the CONCERTO allows it to be installed in any number of

music, ﬁlm, and surround sound systems. For connection instructions for a typical two-channel

stereo system, please see page 15 of this manual. For instructions regarding the use of the BYPASS

INPUTS for surround sound or home theater system use, please see page 15 of this manual.

The main chassis of the CONCERTO 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

preampliﬁer 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 CONCERTO STEREO PREAMPLIFIER by removing the bottom

cover. Doing so will void your warranty and could expose you to dangerous, potentially lethal electrical voltages.

InstallatIon, Use & care

OWNER’S MANUAL CONCERTO STEREO PREAMPLIFIER

The JRDG CONCERTO Stereo

Preampliﬁer 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 kept in mind when

operating the preampliﬁer:

• Do not expose the preamplier to

rain, moisture, or excessively

damp conditions.

• Make sure that the voltage indicated

on the rear panel matches the mains

voltage in your area.

•

The CONCERTO Stereo Preamplier

must not be modied in any way,

other than according to ofcial

service bulletins from JRDG.

Otherwise, the factory warranty

will be immediately voided.

• Be sure the preamplier is muted

(red front panel indicator light on)

before connecting or disconnecting

any interconnect cables.

• When operating the

CONCERTO

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 CONCERTO is designed to per-

form

optimally with no adjustments

maintenance for the lifetime of the

product. Do not attempt to open the

bottom cover of the preamplier and

refer all service issues to qualied

personnel. The voltages inside the

CONCERTO can be hazardous.

• Because of the energy efciency

of the CONCERTO, there is no need

to unplug the unit when not in use;

however, the preamplier can be

muted if desired.

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