Crown SR-2, Studio Reference 2 Owners manual
Operation Manual
Studio Reference Series
®
Studio Reference I
®
Studio Reference II
Obtaining Other Language Versions:
local Crown Distributor. If you need assistance locating your local distributor, please contact Crown at 574-294-8000.
This manual does not include all of the details of design, production, or variations of the equipment. Nor does it cover every possible
situation which may arise during installation, operation or maintenance.
The information provided in this manual was deemed accurate as of the publication date. However, updates to this information may have
occurred. To obtain the latest version of this manual, please visit the Crown website at www.crownaudio.com.
Trademark Notice:
and IQ are registered trademarks of Crown International. Other trademarks are the property of their respective owners.
©2003 by Crown Audio Inc., P.O. Box 1000, Elkhart, Indiana 46515-1000 U.S.A. Telephone: 574-294-8000
Studio Reference, SmartAmp, Grounded Bridge, PIP2 and PIP are trademarks and Crown, Amcron, IOC, ODEP,
To obtain information in another language about the use of this product, please contact your
Some models may be exported under the name Amcron.
®
132176-3
5/03
Important Safety
Instructions
Studio Reference I & II Professional Studio Amplifiers
1) Read these instructions.
2) Keep these instructions.
3) Heed all warnings.
4) Follow all instructions.
5) Do not use this apparatus near water.
6) Clean only with a dry cloth.
7) Do not block any ventilation openings. Install
in accordance with the manufacturer’s instructions.
8) Do not install near any heat sources such as
radiators, heat registers, stoves, or other
apparatus that produce heat.
9) Do not defeat the safety purpose of the polarized or grounding-type plug. A polarized plug
has two blades with one wider than the other.
A grounding-type plug has two blades and a
third grounding prong. The wide blade or the
third prong is provided for your safety. If the
provided plug does not fit into your outlet,
consult an electrician for replacement of the
obsolete outlet.
10) Protect the power cord from being walked on
or pinched, particularly at plugs, convenience
receptacles, and the point where they exit from
the apparatus.
11) Only use attachments/accessories specified by the manufacturer.
12) Use only with a cart, stand, bracket, or table
specified by the manufacturer, or sold with the
apparatus. When a cart is used, use caution
when moving the cart/apparatus combination
to avoid injury from tip-over.
13) Unplug this apparatus during lightning storms or when unused for long periods of time.
14) Refer all servicing to qualified service personnel. Servicing is required when the apparatus
has been damaged in any way, such as powersupply cord or plug is damaged, liquid has
been spilled or objects have fallen into the
apparatus, the apparatus has been exposed to
rain or moisture, does not operate normally,
or has been dropped.
15) To reduce the risk of fire or electric shock, do not expose this apparatus to rain or moisture.
TO PREVENT ELECTRIC SHOCK DO NOT REMOVE
TOP OR BOTTOM COVERS. NO USER SERVICEABLE PARTS INSIDE. REFER SERVICING TO
QUALIFIED SERVICE PERSONNEL.
À PRÉVENIR LE CHOC ÉLECTRIQUE N’ENLEVEZ
PAS LES COUVERCLES. IL N’Y A PAS DES PARTIES SERVICEABLE À L’INTÉRIEUR. TOUS REPARATIONS DOIT ETRE FAIRE PAR PERSONNEL
QUALIFIÉ SEULMENT.
IMPORTANT
Studio Reference Series amplifiers require Class 2
output wiring.
MAGNETIC FIELD
CAUTION! Do not locate sensitive high-gain equipment such as preamplifiers or tape decks directly
above or below the unit. Because this amplifier has
a high power density, it has a strong magnetic field
which can induce hum into unshielded devices that
are located nearby. The field is strongest just above
and below the unit.
If an equipment rack is used, we recommend locating the amplifier(s) in the bottom of the rack and the
preamplifier or other sensitive equipment at the top.
WATCH FOR THESE SYMBOLS:
The lightning bolt triangle is used to alert the user
to the risk of electric shock.
The exclamation point triangle is used to alert the
user to important operating or maintenance instructions.
This device complies with part 15 of the FCC rules. Operation is subject to the following
FCC COMPLIANCE NOTICE
two conditions: (1) This device may not cause harmful interference, and (2) this device
must accept any interference received, including interference that may cause undesired
operation.
CAUTION: Changes or modifications not expressly approved by the party responsible for
compliance could void the user’s authority to operate the equipment.
NOTE: This equipment has been tested and found to comply with the limits for a Class B
digital device, pursuant to part 15 of the FCC Rules. These limits are designed to provide
reasonable protection against harmful interference in a residential installation. This equipment generates, uses, and can radiate radio frequency energy and, if not installed and used
in accordance with the operation manual, may cause harmful interference to radio communications. However, there is no guarantee that interference will not occur in a particular
installation. If this equipment does cause harmful interference to radio or television reception, which can be determined by turning the equipment off and on, the user is encouraged
to try to correct the interference by one or more of the following measures:
• Reorient or relocate the receiving antenna.
• Increase the separation between the equipment and receiver.
• Connect the equipment into an outlet on a circuit different from that to which the receiver
is connected.
• Consult the dealer or an experienced radio/TV technician for help.
page 2
Operation Manual
Studio Reference I & II Professional Studio Amplifiers
Crown International, Inc.
Issued By: Crown International, Inc.
1718 W. Mishawaka Road
Elkhart, Indiana 46517 U.S.A.
European Representative's Name and Address:
Nick Owen
19 Clos Nant Coslech
Pontprennau
Cardiff
CF23 8ND United Kingdom
Equipment Type: Commercial Audio Power Amplifiers
Family Name: Studio Reference
Model Names: Studio Reference I, Studio Reference II
EMC Standards:
EN 55103-1:1995 Electromagnetic Compatibility - Product Family Standard for Audio, Video, Audio-Visual and Entertainment Lighting Control Apparatus for Professional Use, Part 1: Emissions
EN 55103-1:1995 Magnetic Field Emissions-Annex A @ 10 cm and 1 M
EN 61000-3-2:1995+A14:2000 Limits for Harmonic Current Emissions (equipment input current ≤16A per phase)
EN 61000-3-3:1995 Limitation of Voltage Fluctuations and Flicker in Low-Voltage Supply Systems Rated Current ≤16A
EN 55022:1992 + A1: 1995 & A2:1997 Limits and Methods of Measurement of Radio Disturbance Characteristics of ITE: Radiated, Class B Limits; Conducted, Class B
EN 55103-2:1996 Electromagnetic Compatibility - Product Family Standard for Audio, Video, Audio-Visual and Entertainment Lighting Control Apparatus for Professional Use, Part 2: Immunity
EN 61000-4-2:1995 Electrostatic Discharge Immunity (Environment E2-Criteria B, 4k V Contact, 8k V Air Discharge)
EN 61000-4-3:1996 Radiated, Radio-Frequency, Electromagnetic Immunity (Environment E2, criteria A)
EN 61000-4-4:1995 Electrical Fast Transient/Burst Immunity (Criteria B)
EN 61000-4-5:1995 Surge Immunity (Criteria B)
EN 61000-4-6:1996 Immunity to Conducted Disturbances Induced by Radio-Frequency Fields (Criteria A)
EN 61000-4-11:1994 Voltage Dips, Short Interruptions and Voltage Variation
Safety Standard:
EN 60065: 1998 Safety Requirements - Audio Video and Similar Electronic Apparatus
I certify that the product identified above conforms to the requirements of the EMC Council Directive 89/336/EEC as amended by 92/31/EEC, and the Low Voltage Directive 73/23/EES as amended by 93/68/EEC.
Signed
Larry Coburn
Title: Senior Vice President of Manufacturing
DECLARATION of CONFORMITY
Date of Issue: January 1, 2000
Sue Whitfield
574-294-8289
swhitfield@crownintl.com
Operation Manual
DUE TO LINE CURRENT HARMONICS, WE RECOMMEND THAT YOU CONTACT YOUR SUPPLY AUTHORITY BEFORE CONNECTION.
page 3
Table of Contents
Studio Reference I & II Professional Studio Amplifiers
Important Safety Instructions .......................................................2
Declaration of Conformity ............................................................3
1 Welcome .................................................... 5
1.1 Features ...........................................................................5
1.2 How to Use This Manual ..................................................6
2 Setup ......................................................... 7
2.1 Unpack Your Amplifier ....................................................7
2.2 Install Your Amplifier ......................................................7
2.3 Ensure Proper Cooling ...................................................7
2.4 Choose Input Wire and Connectors ................................8
2.5 Choose Output Wire and Connectors ..............................8
2.6 Wire Your System ...........................................................9
2.6.1 Stereo Mode ..........................................................9
2.6.2 Bridge-Mono Mode ...............................................10
2.6.3 Parallel-Mono Mode...............................................11
2.7 Connect to AC Mains ......................................................12
2.8 Startup Procedure ...........................................................12
3 Operation ...................................................13
3.1 Precautions .....................................................................13
3.2 Front Panel Controls and Indicators ...............................15
3.3 Back Panel Controls and Connectors...............................17
4 Advanced Features and Options .........................18
4.1 Indicators .......................................................................18
4.2 Protection Systems ........................................................18
4.2.1 ODEP......................................................................18
4.2.2 Standby Mode........................................................19
4.2.3 Transformer Thermal Protection .............................19
4.2.4 Circuit Breaker ....................................................... 19
4.3 Filter Cleaning ................................................................ 19
4.4 Controls ......................................................................... 20
4.4.1 Level Controls ....................................................... 20
4.4.2 Meter Switches ......................................................20
4.4.3 Ground Lift Switch .................................................21
4.4.4 Input Sensitivity Switch .........................................21
4.5 PIP Modules ...................................................................21
5 Principles of Operation .................................... 22
5.1 Overview ........................................................................22
5.2 Circuit Theory ................................................................ 23
5.2.1 Stereo Operation .................................................... 23
5.2.2 Bridge-Mono Operation .........................................23
5.2.3 Parallel-Mono Operation .......................................23
6 Troubleshooting ............................................ 24
7 Specifications ..............................................25
7.1 Mininum Guaranteed Power Specifications .................... 27
7.2 Maximum Power Specifications ..................................... 29
8. AC Power Draw & Thermal Dissipation ................ 32
9 Service ... .............................................................................. 34
9.1 Worldwide Service .......................................................... 34
9.2 US and Canada Service .................................................. 34
9.2.1 Service at a US or Canada Service Center ............. 34
9.2.2 Factory Service ......................................................34
9.2.3 Factory Service Shipping Instructions ................... 34
10 Warranty ...................................................35
Crown Factory Service Information Form ...................................37
page 4
Operation Manual
Studio Reference I & II Professional Studio Amplifiers
®
1 Welcome
The stunning realism you will experience when
listening to a Crown
fier will redefine your expectations. The evolution of this studio standard ushers in a new era
of powerful, ultraquiet amplifiers capable of
faithfully reproducing the most demanding of
signals. This kind of sonic integrity does not
happen accidentally. It demands the leadership
and technical excellence for which Crown has
long been known.
With the best transfer function in the industry,
ultra-high dynamic range and extraordinary
damping factor, your Studio Reference amplifier
comes closer to the ideal “straight wire with
gain” than any other amplifier. As you listen, it
will become apparent—the amplifier’s low-frequency transient response is the standard by
which all others must be judged.
We have taken great care at every step in the creation of your amplifier—from the selection of its
components to the routing of each wire. It is our
goal to provide you with total satisfaction. This is
one reason why we have spent considerable
®
Studio Reference™ ampli-
effort in providing you with the most complete
Reference Manual in the business. Please read it
carefully—especially the instructions, warnings
and cautions. It will help you successfully install
and use your new amplifier. Be sure to read Sections 2.5.2 and 2.5.3 if you plan to use one of the
amplifier’s two mono modes.
1.1 Features
• Accurate Studio Reference amplifiers integrate
several cutting edge technologies that make
them the most accurate reference amplifiers
available. For example, in Stereo mode each
channel can actually be treated as a separate
amplifier because of its separate high-voltage
power supplies and ultra-low crosstalk. Here are
some of its many impressive features:
• Crown’s unconventional Grounded Bridge™
circuitry delivers incredible voltage swings without using stressful output transistor configurations like other more traditional amplifiers. This
results in significantly lower distortion and
superior reliability.
• Patented ODEP
®
(Output Device Emulation
Protection) circuitry detects and compensates
for overheating and overload to keep the amplifier working when others would fail.
®
• IOC
(Input/Output Comparator) circuitry
immediately alerts you of any distortion that
exceeds 0.05% to provide dynamic proof of distortion-free performance.
• PIP™ (Programmable Input Processor) connector accepts accessories that tailor your
amplifier to suit specific applications.
• Extremely wide dynamic range.
• Ultra-high damping factor delivers superior
loudspeaker motion control for the cleanest,
tightest bottom end you’ve ever felt—or heard.
• Super-low harmonic and intermodulation distortion give your amplifier the best transfer function in the business.
• Two mono modes (Bridge-Mono and ParallelMono) for driving a wide range of load impedances.
• Custom-designed, tape-wound, low-noise
toroidal supplies with extremely high power density.
• High-voltage headroom and high-current
headroom provide energy reserves that make it
easy to drive low-impedance loads and highly
reactive loads to full power.
• Full protection against shorted outputs, mismatched loads, general overheating, DC and
Operation Manual
page 5
1 Welcome
Studio Reference I & II Professional Studio Amplifiers
high-frequency overloads. Full overvoltage and
internal fault protection.
• Indicators include Enable, ODEP, IOC, Signal
Presence and the Dynamic Range/Level meter.
• Balanced phone jacks and XLR connectors
are provided for input. Two pair of 5-way binding
posts per channel are provided for versatile output connection.
• Ground lift switch isolates the AC power and
phone jack audio grounds.
• Efficient heat sinks and a self-contained, ondemand, infinitely variable forced-air cooling
system prevents overheating and prolongs component life.
• Internal three-position input sensitivity switch
provides settings of 0.775 volts and 1.4 volts for
standard 1 kHz power, and 26 dB gain.
• Mounts in a standard 19 inch (48.3 cm)
equipment rack, or units can be stacked directly
on top of each other.
• Three year “No-Fault” full warranty completely protects your investment and guarantees
its specifications.
1.2 How to Use This Manual
This manual provides you with the necessary
information to safely and correctly setup and
operate your amplifier. It does not cover every
aspect of installation, setup or operation that
might occur under every condition. For additional information, please consult Crown’s
Amplifier Application Guide (available online at
www.crownaudio.com), Crown Technical Support, your system installer or retailer.
We strongly recommend you read all instructions, warnings and cautions contained in this
manual. Also, for your protection, please send in
your warranty registration card today. And save
your bill of sale — it’s your official proof of purchase.
page 6
Operation Manual
Studio Reference I & II Professional Studio Amplifiers
2 Setup
Figure 2.1 Removing an
End Cap
2.1 Unpack Your Amplifier
Please unpack and inspect your amplifier for
any damage that may have occurred during
transit. If damage is found, notify the transportation company immediately. Only you can initiate a claim for shipping damage. Crown will
be happy to help as needed. Save the shipping
carton as evidence of damage for the shipper’s
inspection.
We also recommend that you save all packing
materials so you will have them if you ever
need to transport the unit. Never ship the
unit without the factory pack.
YOU WILL NEED (not supplied):
• Input wiring cables
• Output wiring cables
Rack for mounting amplifier (or a stable surface
for stacking)
WARNING: Before you start to set up
your amplifier, make sure you read and
observe the Important Safety Instructions found at the beginning of this
manual.
Before proceeding, make sure the meter
switches are set to your liking. The front panel
assembly must first be removed to changed
these switches, so it is easier to do before the
unit is mounted (see Section 4.4.2).
The rack ears are covered by two attractive end
caps which are held in place by phillips screws
(see Figure 2.1). To use the rack ears, remove
the screws and lift off the caps. With sufficient
side clearance, you can reinstall the end caps
once the amplifier is mounted in the rack.
2.2 Install Your Amplifier
CAUTION: Before you begin, make sure
your amplifier is disconnected from the
power source, with the power switch in
the “off” position and all level controls
turned completely down (counterclockwise).
Use a standard 19-inch (48.3 cm) equipment
rack (EIA RS-310B). See Figure 2.2 for amplifier dimensions.
You may also stack amps without using a
cabinet.
NOTE: When transporting, amplifiers should be
supported at both front and back.
®
FRONT VIEW
19 in
(48.3 cm)
SIDE VIEW
16 in
(40.6 cm)
(3.6 cm)
Figure 2.2
Dimensions
1.4 in
7 in
(17.3 cm)
2.3 Ensure Proper Cooling
When using an equipment rack, mount units
directly on top of each other. Close any open
spaces in rack with blank panels. DO NOT
block front, rear or side air vents. The side
walls of the rack should be a minimum of two
inches (5.1 cm) away from the amplifier sides,
and the back of the rack should be a minimum
of four inches (10.2 cm) from the amplifier back
panel.
Figure 2.3 illustrates standard amplifier airflow.
Figure 2.3 Airflow
Operation Manual
page 7
2 Setup
2.4 Choose Input Wire and Connectors
Crown recommends using pre-built or professionally wired, balanced line (two-conductor plus shield), 22-24 gauge cables and
connectors. Use either 3-pin male XLR connectors orTRS phone
plugs at the amplifier inputs.
Unbalanced lines may also be used but may result in noise over
long cable runs.
Connector pin assignments and wiring are shown in thes
Figures:
Figure 2.4: Unbalanced XLR
Figure 2.5: Balanced XLR
Figure 2.6: Balanced and unbalanced phone plugs.
NOTE: Custom wiring should only be performed by
qualified personnel.
2.5 Choose Output Wire and Connectors
Crown recommends using pre-built or professionally wired, highquality, two-conductor, heavy gauge speaker wire and connectors.
You may use banana plugs, spade lugs, or bare wire for your output connectors (Figure 2.7). To prevent the possibility of shortcircuits, wrap or otherwise insulate exposed loudspeaker cable
connectors.
NOTE: Binding post outputs on European models come
with safety plugs installed to prevent European powercord plugs from being inserted. The top & bottom entry
positions for these connectors should therefore be used
with European models.
Using the guidelines below, select the appropriate size of wire
based on the distance from amplifier to speaker.
Distance Wire Size
up to 25 ft. 16 AWG
26-40 ft. 14 AWG
41-60 ft. 12 AWG
61-100 ft. 10 AWG
101-150 ft. 8 AWG
151-250 ft. 6 AWG
CAUTION: Never use shielded cable for output wiring.
Studio Reference I & II Professional Studio Amplifiers
Figure 2.5 Balanced Input Wiring
Figure 2.6 Balanced and Unbalanced Phone Plugs
Figure 2.4 Unbalanced Input Wiring
Figure 2.7
Output Connector
Wiring
Note: Each output channel has two sets of
binding posts (not shown here) to make it
easier to connect multiple loudspeaker
cables to each channel.
page 8
Operation Manual
Studio Reference I & II Professional Studio Amplifiers
2 Setup
2.6 Wire Your System
2.6.1 Stereo Mode
Typical input and output wiring is shown in
Figure 2.8.
Turn off the amplifier and set the
Stereo/Mono Switch to Stereo.
INPUTS: Connect input wiring for both channels.
NOTE: Crown provides a reference of wiring pin
assignments for commonly used connector
types in the Crown Amplifier Application Guide
available at www.crownaudio.com.
OUTPUTS: Each output channel has two sets of
binding posts to make it easier to connect multiple loudspeaker cables to each channel.
Maintain proper polarity (+/–) on output connectors.
Connect Channel 1 loudspeaker’s positive (+)
lead to Channel 1 positive (red) terminal of amp;
repeat for negative (–). Repeat Channel 2 wiring
as for Channel 1.
CAUTION: In Stereo mode, never tie an
amplifier’s outputs together directly, and
never parallel them with the output of
another amplifier. Such connections do not
result in increased output power, but may
activate the protection circuitry to prevent overheating.
CHANNEL 1
CHANNEL 2
MIXER
CH-2 CH-1
STUDIO REFERENCE
AMPLIFIER
STEREO
PARALLEL
MONO
CAUTION: TURN OFF AMPLIFIER
BEFORE CHANGING THIS SWITCH!
BRIDGE
MONO
FX
PUSHPUSH
STUDIO
Referen ce
CHANNEL 2
LOUDSPEAKER
CHANNEL 1
LOUDSPEAKER
–
+
+
–
Figure 2.8
Stereo Wiring
Operation Manual
page 9
2 Setup
2.6.2 Bridge-Mono Mode
Bridge-Mono mode is used to drive loads with a
total impedance of 4 ohms or higher.
Typical input and output wiring is shown in
Figure 2.9.
Turn off the amplifier and set the
Stereo/Mono Switch to Bridge Mono.
INPUTS: Use only the Channel 1 input
connector.
NOTE: Crown provides a reference of wiring pin
assignments for commonly used connector
types in the Crown Amplifier Application Guide
available at www.crownaudio.
OUTPUTS: Connect the speaker across the red
binding post of each channel. Do not use the
black binding posts when the amp is being operated in Bridge-Mono mode.
The load MUST be balanced (neither side
shorted to ground).
NOTE: The Channel 2 level control MUST
be turned down (full CCW) when operating the amplifier in Bridge-Mono mode.
CAUTION: Connect only balanced
equipment (meters, switches, etc.) to the
Bridge-Mono output. Both sides of the
line must be isolated from the input
ground, or oscillations may occur.
MIXER
STUDIO REFERENCE
AMPLIFIER
STEREO
PARALLEL
MONO
CAUTION: TURN OFF AMPLIFIER
BEFORE CHANGING THIS SWITCH!
Studio Reference I & II Professional Studio Amplifiers
–
+
LOUDSPEAKER
DO NOT USE
THE BLACK
BINDING
POSTS.
BRIDGE
MONO
CHANNEL 1
FX
DO NOT USE
THE CHANNEL 2
INPUTS.
STUDIO
Referen ce
Bridge-Mono Wiring
CH-2 CH-1
PUSHPUSH
Figure 2.9
page 10
Operation Manual
Studio Reference I & II Professional Studio Amplifiers
2 Setup
2.6.3 Parallel-Mono Mode
Parallel-Mono mode is used to drive loads with
a total impedance of less than 4 ohms.
Typical input and output wiring is shown in
Figure 2.10.
Turn off the amplifier and set the
Stereo/Mono Switch to Parallel-Mono.
Note: It is normal for the Channel 2 IOC
indicator to stay on in Parallel-Mono mode.
INPUTS: Use only the Channel 1 input
connector.
NOTE: Crown provides a reference of wiring pin
assignments for commonly used connector
types in the Crown Amplifier Application Guide
available at www.crownaudio.
OUTPUTS:
• Connect speaker positive (+) lead to
Channel 1 red (+) binding post.
• Connect speaker negative (–) lead to
Channel 2 black (–) binding post.
• Add a 14 gauge or larger jumper between the
Channel 1 and 2 red (+) binding posts.
NOTE: The Channel 2 level control MUST
be turned down (full CCW) when operating the amplifier in Parallel-Mono mode.
CAUTION: When Parallel-Mono wiring is
installed, do not attempt to operate in
Stereo or Bridge-Mono mode until the
wiring is removed (especially the jumper
wire). Failure to do so will lresult in high
distortion and excessive heating.
MIXER
STUDIO REFERENCE
AMPLIFIER
STEREO
PARALLEL
MONO
CAUTION: TURN OFF AMPLIFIER
BEFORE CHANGING THIS SWITCH!
CHANNEL 1
ADD A 14 GAUGE
JUMPER BETWEEN
THE CHANNEL 1
BINDING POSTS
PUSHPUSH
BRIDGE
MONO
FX
THE CHANNEL 2
INPUTS ARE
NOT USED
Referen ce
STUDIO
Figure 2.10 Parallel-Mono Wiring
OR LARGER
AND 2 RED (+)
CH-2 CH-1
+
–
LOUDSPEAKER
Operation Manual
page 11
2 Setup
Studio Reference I & II Professional Studio Amplifiers
2.7 Connect to AC Mains
Connect your amplifier to the AC mains power
source (power outlet) with the supplied AC power
cordset. First, connect the IEC end of the cordset to
the IEC connector on the amplifier; then, plug the
other end of the cordset to the AC mains.
WARNING: The third prong of this connector
(ground) is an important safety feature. Do
not attempt to disable this ground connection by using an adapter or other methods.
Amplifiers don’t create energy. The AC mains voltage and current must be sufficient to deliver the
power you expect. You must operate your amplifier
from an AC mains power source with not more than
a 10% variation above or a 15% variation below the
amplifier’s specified line voltage and within the
specfied frequency requirements (indicated on the
amplifier’s back panel label). If you are unsure of the
output voltage of your AC mains, please consult
your electrician.
2.8 Startup Procedure
Use the following procedure when first turning on
your amplifier:
1. Turn down the level of your audio source.
2. Turn down the level controls of the amplifier.
3. Turn on the “Enable” switch. The Enable indicator should glow.
4. Turn up the level of your audio source to an
optimum level.
5. Turn up the Level controls on the amplifier until
the desired loudness or power level is
achieved.
6. Turn down the level of your audio source to its
normal range.
If you ever need to make any wiring or installation
changes, don’t forget to disconnect the power cord.
For help with determining your system’s optimum
gain structure (signal levels) please refer to the
Crown Amplifier Application Guide, available online
at www.crownaudio.com.
page 12
Operation Manual
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