JEFF ROWLAND 102 User manual

MODEL 102 S STEREO AMPLIFIER
OWNER’S MANUAL MODEL 102 STEREO AMPLIFIER

© Jeff Rowland design gRoup 2007. all Rights ReseRved.
TABLE OF CONTENTS
Introduction 2
Product Features 3
Package Contents 4
Initial Inspection 5
Maintenance & Cleaning 6-7
Protection Systems 7
Installation, Use & Care 8-9
Signal & Power Connections 10-12
Specications 13
Dimensions 14
OWNER’S MANUAL MODEL 102/102 s sTEREO AMPLIFIER

PO BOX 7231, COLORADO SPRINGS, COLORADO 80933 USA E-mAIL: [e-mail] www.jEffROwLAND.COm TELEPHONE [phone]
2
If you have any additional questions
regarding the installation or operation
of the Model 102 Stereo Amplifier, 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
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 102
Stereo Amplifier serial number begins with
the letters “SD”. This serial number is
located on the rear panel of the chassis.
Please include this number with any corre-
spondence regarding your Model 102
Stereo Amplifier. 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 amplifiers. With its
combination of features such as precision
electronic circuitry, exceptional
efficiency,
and accurately machined chassis compo-
nents throughout, your
Model 102 Stereo
Amplifier will offer you many years of musi-
cally 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
INTRODUCTION
OWNER’S MANUAL MODEL 102/102 s sTEREO AMPLIFIER

© Jeff Rowland design gRoup 2007. all Rights ReseRved.
3
• One pair XLR input connectors for
balanced system congurations.
Same gain and input impedance
characteristics are ensured whether
XLR or RCA adapted inputs are used.
• CE approved speaker output terminals
require no tools for secure, low resis-
tance connections.
• Fully-balanced topology implemented
in both input and output circuitry.
• Low noise, high-current, switch-
mode power supply provides highest
performance at any world-wide
mains operating voltage and ensures
consistent performance under all
operating and AC line conditions.
• Fully-balanced inputs provide
universal compatibility with other
components and eliminate ground
loop noise and EMI.
• High efciency ICEpower® power
conversion technology generates
high output power with very little heat,
promotes long component life and
permits a relatively small physical size.
• Low power consumption permits
constant power-up operation to
eliminate warm-up time.
• Ultra-low resonance, structurally
rigid chassis, precision-machined
from a solid block of aircraft grade
6061-T6 aluminum.
• Remote ON/OFF input jack allows
amplier standby operation from
a remote source for inclusion into
home theater (A/V) systems.
PRODUCT FEATURES
OWNER’S MANUAL MODEL 102/102 s sTEREO AMPLIFIER

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Ensure that all of the auxiliary components listed below are enclosed within the shipping carton
and accessory box. Refer to the illustrations and verify that the proper components are included.
AC POWER CABLE
WARRANTY REGISTRATION
WARRANTY CARD OWNER’S MANUALMODEL 102 STEREO AMPLIFIER
PACKAGE CONTENTS
OWNER’S MANUAL MODEL 102/102 s sTEREO AMPLIFIER

© Jeff Rowland design gRoup 2007. all Rights ReseRved.
5
Inspect the shipping container for damage. If any portion of 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 notication and inspection within 24 hours of delivery to determine the nature of damages incurred.
Your Model 102 Stereo Amplifier 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 amplifier does not operate correctly,
please notify your dealer immediately.
We strongly suggest that you save all of the packing materials. If the amplifier 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 MODEL 102/102 S STEREO AMPLIFIER

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All JRDG products are designed to provide a lifetime of enjoyment
and listening pleasure. The Model 102 Stereo
Amplifier 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 MODEL 102/102 S STEREO AMPLIFIER

© Jeff Rowland design gRoup 2007. all Rights ReseRved.
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Protection SyStemS
The Model 102 Stereo Amplifier 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
amplifier
will not be used for extended periods of time, the amplifier
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 Model
102 Stereo Amplifier, 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.

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Locate the amplifier as close as possible to its final installation point. Allow access to the rear
panel for making connections.
Due to it’s design, the Model 102 Stereo Amplifier is energy efficient, eliminating the need for
heatsinks or forced-air cooling. As a result, the Model 102 Stereo Amplifier can be housed in
a cabinet or custom enclosure with no fear of overheating.
The efficient and compact design of the Model 102 allows it to be installed in any number of
music, film and surround sound systems. For connection instructions for use in a typical two-
channel stereo system, please see page 11 of this manual.
The main chassis of the Model 102 is machined out of a solid block of aluminum to create
as rigid an enclosure as possible, impervious
to lateral and torsional forces. The amplifier 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 MODEL 102 STEREO AMPLIFIER 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 MODEL 102/102 S STEREO AMPLIFIER

© Jeff Rowland design gRoup 2007. all Rights ReseRved.
9
The JRDG Model 102 Stereo
Amplifier 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 amplifier.
• Do not expose the amplier to
rain, moisture, or excessively
damp conditions.
• Due to auto-ranging circuitry and
dual-stage voltage regulation, the
audio performance will not be
affected by any voltage uctuations
within the operating voltage range.
The Model 102 Stereo Amplier can
be operated at any mains voltage
over the range of 85 to 265 VAC
without any adjustments necessary.
• The Model 102 Stereo Ampli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 amplier power switch
is turned off or AC power cable
is removed
before connecting or
disconnecting any loudspeaker or
interconnect cables.
• When operating the Model 102,
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 Model 102 is designed to per-
form
optimally with no adjustments
or
maintenance for the lifetime of the
product. Do not attempt to open the
bottom cover of the amplier and
refer all service issues to qualied
personnel. The voltages inside the
Model 102 can be hazardous.
• Because of the energy efciency
of the Model 102, there is no need
to turn the unit off when not in use
except in the event of severe voltage
hazards as mentioned previously.

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The Model 102 Stereo Amplifier offers excellent
compatibility with associated audio and A/V
components. Before attempting any system
interconnection, please familiarize yourself with
the panel controls and indicators of the Model
102. The descriptions correspond with the
illustrations identified as numbers 1-4.
POWER INDICATOR LEDs: When the amplifier is first connected to AC mains, (or the AC main
switch is switched “on”, 102 S only) the small front panel power indicators will illuminate red.
After one second the indicators will switch to green. The amplifier is in operational mode when-
ever the indicators are green. If either or both indicators are red, an operational error condition
is indicated such as an overdrive or overheat fault condition. If the amplifier is placed into
STANDBY MODE, both indicators will switch to red.
MASTER AC POWER SWITCH (102 S Only, INSET): This switch controls the operating status
of the amplifier. Pressing the “I” symbol on the switch will turn the amplifier ON. Pressing the
“
O ” symbol on the switch will turn the amplifier OFF .
1 32 1 2
4
INSET: Master AC
Power Switch (102 S Only)
signal & power connections
OWNER’S MANUAL MODEL 102/102 S STEREO AMPLIFIER

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(1) LOUDSPEAKER OUTPUT: Unscrew the knob that secures the speaker output connector
and pull the securing block out far enough to allow access to the binding posts. Install the
positive (usually red) loudspeaker cable spade terminal to the positive (+) binding post and the
negative spade terminal to the negative (-) binding post. Secure the loudspeaker connections by
tightening the knob securely with your fingers. The Model 102 will only accept spade terminated
loudspeaker cables. Banana plugs or bare wire connections can be used but require an optional
clamp available from your JRDG Dealer.
(2) BALANCED INPUTS: XLR interconnects from your preamplifier or multichannel processor
should be connected to BALANCED INPUTS LEFT and RIGHT. A slight mechanical click may be
heard when the balanced XLR interconnect cables are correctly installed and locked into
the rear
panel connector. The unlocking tab must be pressed to disconnect the XLR interconnect cable
from the amplifier. When using unbalanced RCA interconnects, you can convert the XLR inputs
to unbalanced operation by installing an XLR to RCA adapter, available from your JRDG dealer.
NOTE: Pin 2 of the XLR connector is signal positive with respect to speaker output positive. Also, JRDG recommends
balanced cables as the preferred method of interconnection. XLR to RCA adaptors are available from JRDG if RCA,
single-ended interconnects are used. Amplier gain is not affected by choice of input type.
INSET: Master AC
Power Switch (102 S Only)
WARNING: Both positive and negative outputs
are electrically active with respect to chassis
and/or system ground potential. Therefore, this
amplier cannot be used in certain loudspeaker
switching congurations, such as those used in retail
demonstrations. Failure to avoid these precautions
may short the outputs to ground and can result in
damage to the amplier and will void the warranty.
Certain subwoofer speakers which derive signals from
amplier outputs will require additional circuitry to
properly isolate the amplier output. Please contact
JRDG before connecting these types of subwoofers.
signal & power connections
OWNER’S MANUAL MODEL 102/102 S STEREO AMPLIFIER

PO BOX 7231, COLORADO SPRINGS, COLORADO 80933 USA E-mAIL: [e-mail] www.jEffROwLAND.COm TELEPHONE [phone]
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(4) POWER CONDITIONING: AC power conditioners and
custom AC mains power cables are a
common accessory
in many high performance audio and video systems and
can be used to improve the quality of music reproduction
in certain instances. We have supplied the best
possible
basic power cord with the Model 102; however, many users
may wish to use aftermarket AC power cords available from
many cable manufacturers. Since we have not found an
optimal universal power conditioner or cable we cannot
recommend any particular type or brand for use with the
Model 102. Please use your dealer’s help and knowledge
as a resource to select the proper accessories for your
individual system needs.
WARNING: Serious damage to internal circuitry can occur if
improperly wired or unapproved AC power cords are used. Your
dealer can be a helpful resource for selecting the proper accessories for
your needs. Also, if the unit is plugged into a voltage different from the
range listed on the back panel, it will result in serious damage and will
void
the warranty.
FIGURE 1: Detail of 12V remote trigger and mini-plug connector
requirements
NOTE: Please be aware that the remote feature simply places the
amplier in standby mode and does not disconnect the unit from
power or AC mains.
NOTE: If a 12V DC switching source is not available, then a short
circuit between the “tip” and “sleeve” of the 1/8” mini-plug connector
will place the amplier into the STANDBY MODE. Removing the
short circuit will return the amplier to the OPERATIONAL MODE.
Constant 3v To 15v DC Signal
(12VDC Typical) (tip)
Ground (sleeve)
(3) 12V REMOTE TRIGGER: A 1/8” (3.5 mm) mini-plug connector is provided
on the rear
panel for remotely switching the amplifier between Operational
and Standby modes. When connected to another component with
the proper
circuitry, the amplifier standby
function can be turned ON and OFF remotely
in a custom installation, theater, or automated system setup. (See FIGURE 1)
signal & power connections
OWNER’S MANUAL MODEL 102/102 S STEREO AMPLIFIER

© Jeff Rowland design gRoup 2007. all Rights ReseRved.
13
Output Power, Continuous RMS 100 watts @ 8 ohms, 200 watts @ 4 ohms per channel
Frequency Response 5 Hz – 65 kHz, -3 dB @ 8 ohms
Peak Output Current 11 amps
Dynamic Range 110 dBa
Load Impedance Range 3 ohms – 16 ohms
Input Impedance 48k ohms
THD + Noise, 0.1 watts – 200 watts, 4 ohms < 0.2%, Typically .02% @ 1 kHz
CCIF Intermodulation Distortion, 14/15 kHz < .0005%, 10 watts, 4 ohms
Damping Factor @ 1 kHz > 1000
Overall Gain (Balanced or Unbalanced) 27 dB
Common Mode Rejection Ratio > 85 dB, 20 Hz – 20 kHz
Absolute Phase Non-inverting, Pin 2 Positive
Inputs 1 Balanced (XLR) per channel
(Unbalanced operation requires an optional XLR to RCA adapter)
Outputs 1 CE-Approved Speaker Wire Clamp per channel
Power Consumption Idle – 10 watts, Maximum – 500 watts
Amplifier Weight
7.4 lbs. / 3.4 kg
Overall Amplifier Dimensions (H) x (W) x (D) 2.9” x 13.7” x 7.3”
74mm x 348mm x 185mm
SPECIFICATIONS
OWNER’S MANUAL MODEL 102/102 S STEREO AMPLIFIER

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13.7 in. (348 mm)
2.9 in. (74 mm)
7.3 in. (185 mm)
2.4 in. (61 mm)
5.8 in. (147 mm)
DIMENSIONS
OWNER’S MANUAL MODEL 102/102 S STEREO AMPLIFIER

PO BOX 7231, COLORADO SPRINGS, COLORADO 80933 USA E-mAIL: [e-mail] www.jEffROwLAND.COm TELEPHONE [phone]