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  9. Crown Studio Reference I User manual

Crown Studio Reference I User manual

Studio Reference ISTUDIO REFERENCE SERIES
T
The stunning realism you will experience
when listening to a Crown®Studio Refer-
ence™ amplifier will redefine your expec-
tations. 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 excel-
lence 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.
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 sup-
plies and ultra-low crosstalk.
Crown’s unconventional Grounded Bridge™ cir-
cuitry delivers incredible voltage swings with-
out using stressful output transistor configu-
rations like other more traditional amplifiers.
This results in significantly lower distortion and
superior reliability.
For more details about the Studio Reference I
and Studio Reference II, contact the Crown
Technical Support Group at 800-342-6939 or
574-294-8200. Also, visit the Crown Audio
website at www.crownaudio.com.
Specifications
The following apply to units in dual mode with both channels
driven into 8 ohm loads and an input sensitivity of 26 dB gain
unless otherwise specified.
Power
Output Power: See power charts below.
Features
• Patented ODEP
®
(Output Device Emulation
Protection) circuitry detects and compen-
sates 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) con-
nector 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 Parallel-
Mono) for driving a wide range of load imped-
ances.
• Custom-designed, tape-wound, low-noise
toroidal supplies with extremely high power
density.
Performance
Frequency Response: ±0.1 dB from 20 Hz to
20 kHz at 1watt.
Phase Response: +5 to –15 degrees from 20
Hz to 20 kHz at 1 watt.
Signal-to-Noise (A-weighted) below rated full
bandwidth power: Studio Reference I: 120 dB.
Studio Reference II: 117 dB.
Total Harmonic Distortion (THD): Less than
0.1% at full bandwidth power.
Intermodulation Distortion (IMD): (60 Hz and
7 kHz 4:1)
Studio Reference I:< 0.005% from full
bandwidth power to 78 watts, rising
linearly to 0.025% at 78 milliwatts.
Studio Reference II:< 0.005% from full
bandwidth power to 36 watts rising linearly
to 0.025% at 36 milliwatts.
Crosstalk (below rated full bandwidth power):
Studio Reference I:>100 dB from 20
Hz to 400 Hz and >70 dB at 20 kHz.
Studio Reference II:>100 dB from 20 Hz
to 400 Hz and >65 dB at 20 kHz.
Damping Factor: >20,000 from 10 Hz to 400
Hz.
Voltage Gain (at the maximum level setting):
Studio Reference I:
103:1 ± 6% or 40 dB ±0.5 dB at
0.775 volt sensitivity.
57:1 ± 6% or 35 dB ± 0.5 dB at
1.4 volt sensitivity.
20:1 ± 6% at 26 dB gain ± 0.5 dB.
Studio Reference II:
69:1 ± 6% or 37 dB ± 0.5 dB at
0.775 volt sensitivity.
38:1 ± 6% or 32 dB ± 0.5 dB at
1.4 volt sensitivity.
20:1 ± 6% at 26 dB gain ± 0.5 dB
Load Impedance: Safe with all types of loads.
4-8 ohms in Stereo mode, 8-16 ohms in
Bridge-mono mode, and 2-4 ohms in Parallel-
Mono mode.
AC Line Voltage and Frequency Configurations
Available (± 10%): 50 or 60 Hz; 100, 120, 200,
220 or 240VAC. Power draw at idle is 90 watts
or less.
Studio Reference II fi
8 ohm Bridge-Mono
*1 kHz
Power
2,220W
780W
1,160W
2,315W
1,580W
16 ohm Bridge-Mono
2 ohm Parallel-Mono
4 ohm Stereo (per channel)
8 ohm Stereo (per channel)
1,565W
4 ohm Parallel-Mono
Studio Reference I
*1 kHz Power: refers to maximum average power in watts
at 1 kHz with 0.05% THD.
8 ohm Bridge-Mono
*1 kHz
Power
1,100W
355W
555W
1,115W
715W
16 ohm Bridge-Mono
2 ohm Parallel-Mono
4 ohm Stereo (per channel)
8 ohm Stereo (per channel)
710W
4 ohm Parallel-Mono
Studio Reference II
*1 kHz Power: refers to maximum average power in watts
at 1 kHz with 0.05% THD.
Crown International
P.O. Box 1000
Elkhart, IN 46515-1000
TEL: 574-294-8200
FAX: 574-294-8FAX
www.crownaudio.com
7/03 136734-1
Crown’s Three-Year, No-Fault, Fully Transferable Warranty
Crown offers a Three-Year, No-Fault, Fully Transferable Warranty for every new Crown ampli-
fier—an unsurpassed industry standard. With this unprecedented No-Fault protection, your new
Crown amplifier is warranted to meet or exceed original specifications for the first three years of
ownership. During this time, if your amplifier fails, or does not perform to original specifications,
it will be repaired or replaced at our expense. About the only things not covered by this warranty
are those losses normally covered by insurance and those caused by intentional abuse. And the
coverage is transferable, should you sell your amplifier.
See your authorized Crown dealer for full warranty disclosure and details. For customers outside
of the USA, please contact your authorized Crown distributor for warranty information or call
574-294-8200.
Specifications subject to change without prior notice. Latest
information available at www.crownaudio.com.
Grounded Bridge, PIP, and Studio Reference are trademarks,
and Crown, ODEP, and IOC are registered trademarks of
Crown International. Other trademarks are the property of
their respective owners. Printed in U.S.A.
© 2003 Crown Audio, Inc.
Controls
Power: A two-position front panel pushbutton
on/off switch. Four-second turn-on delay.
Level: An independent 31-position detented
front-panel level control for each channel.
Reset Switch: This back panel switch can be
used to trip and reset the AC mains circuit
breaker.
Stereo/Mono Switch: Back-panel switch
selects between Stereo, Bridge-mono, and
Parallel-mono modes.
Ground Lift Switch: The input signal ground
may be isolated from the AC ground with this
back-panel switch to help prevent unwanted
ground loops. It affects only the phone jacks.
It has no effect on the PIP module’s XLR
connectors. Activating the switch inserts an
impedance between the sleeve of each phone
input jack and the circuit ground.
Input Sensitivity Switch: The three-position
input sensitivity switch inside the amplifier
can be accessed by removing the PIP module.
Settings include 0.775 volts and 1.4 volts for
rated output, and 26 dB voltage gain.
Meter Switches: Two switches behind the
front panel can make the output meters dis-
play either the dynamic range of the output
signal in dB (factory default), or the output
level in dB.
Indicators
Signal Presence: The green front panel indi-
cator for each channel flashes synchronously
with the channel’s output signal to indicate its
presence.
Enable Indicator: This indicator lights when the
amplifier has been “enabled” or turned on, and
AC power is available.
ODEP Indicators: During normal operation of
the amplifier, the ODEP (Output Device Emu-
lation Protection) indicators glow brightly to
show the presence of reserve thermodynamic
energy. They dim proportionally as energy
reserves decrease. In the rare event that energy
reserves are depleted, the indicators turn off
and ODEP proportionally limits the output drive
so the amplifier can safely continue operating
even under severe conditions. These indicators
also help to identify more unusual operating
conditions.
Input/Output Comparator: The red Input/Output
Comparator (IOC) indicator for each channel
flashes if any type of distortion reaches 0.05%.
Dynamic Range/Level Meters: A five-segment
output meter is provided for each channel. The
meters are factory-set to show dynamic range
of the signals in dB, which is computed as the
ratio of peak to average output power. Also,
the meter can optionally be set to show output
levels.
Input/Output
Input Connectors: Balanced ¼-inch (6.35-mm)
phone jack for each channel. Balanced three-
pin female XLR connector on the PIP-FX for
each channel.
Input Impedance: Nominally 10 k ohms, bal-
anced. Nominally 5 k ohms, unbalanced.
Input Sensitivity: Configurable for 26 dB gain,
0.775 volt sensitivity, or 1.4 volt sensitivity.
Output Connector: Two pairs of versatile 5-way
binding posts are provided for the output of
each channel so multiple loudspeakers can be
connected easily. They accept banana plugs,
spade lugs or bare wire.
Output Impedance: <10 milliohms in series
with 2.5 microhenries.
DC Output Offset: ± 2 millivolts.
Output Signal
Dual: Unbalanced, two channel.
Bridge-Mono: Balanced, single channel. Chan-
nel 1 controls are active; channel 2 controls
should be turned down.
Parallel-Mono: Balanced, single channel.
Channel 1 controls are active; channel 2 con-
trols should be turned down.
Protection
Studio Reference amplifiers provide extensive
protection and diagnostics capabilities. Protec-
tion systems include ODEP, standby mode, an
AC circuit breaker and transformer thermal pro-
tection. These systems will prevent amplifier
damage in virtually any situation. A four-second
turn-on delay prevents power-on thumps.
Construction
Durable black finish on aluminum chassis.
Dimensions: EIA Standard 19-inch (48.3-cm)
rack mount width (EIA RS-310B), 7 inches
(17.8 cm) high and 16 inches (40.6 cm) deep
behind mounting surface and 2.75-inch (7-cm)
protrusion in front of mounting surface
Net Weight:
Studio Reference I:60.7 lb (27.6 kg)
Studio Reference II: 56.1 lb (25.5 kg).
Shipping Weight:
Studio Reference I:74.2 lb (33.7 kg)
Studio Reference II:69.6 lb (31.6 kg).
Cooling: Flow-through ventilation from front to
sides. On-demand proportional speed fan.
Studio Reference I
Studio Reference II
Registered with the
U.S. Patent Office.
4,330,809
4,611,180
CAUTION: To prevent electric
shock do not remove the top or
bottom covers. There are no user
serviceable parts inside. Please
refer all servicing to qualified
service personnel. Disconnect
the power cord before removing
the P.I.P. module to access the
input sensitivity switch inside
the amplifier.
ATTENTION: Débrancher avant
d'ouvrir.
WARNING: To reduce the risk
of fire or electric shock, do not
expose this equipment to rain or
moisture.
BRIDGE-MONO OUTPUT WIRING
Turn the amplifier off. PARALLEL-MONO OUTPUT WIRING
Turn the amplifier off.
Set the Stereo/Mono
switch to Parallel-Mono.
Add jumper (14+ gage)
across “+” terminals.
Output across the
Ch-1 terminals only.
1
2
3
4
1
2
3+
–
+
–
UNBALANCED
INPUT WIRING
BALANCED
INPUT WIRING CH-2 CH-1
+
–
TIP
RING
SLEEVE
GND
INPUT GROUND LIFT
LIFT
+TIP
SLEEVE
GND
(AFFECTS PHONE INPUTS ONLY.)
(MONO)
CAUTION: Turn off the amplifier
before changing this switch!
STEREO
BRIDGE
MONO
PARALLEL
MONO
This amplifier is equipped with a selectable input sensitivity. Remove the P.I.P. module to access the sensitivity switch.
OFF RESET ON CH-2 CH-1
Set the Stereo/Mono
switch to Bridge-Mono.
Output across the
“+” terminals only.
Ch-1 is positive.
Class 1 output wiring is required.
Designed and constructed by
the Professional Audio Division
of Crown International, Inc.
1718 West Mishawaka Rd.
Elkhart, Indiana 46517 U.S.A.
Model: Reference 1
50/60 Hz AC Volts: 120 Current: 17.8 Amps
Maximum Output: 1,160 watts per channel
into 4 ohms at 1 kHz with no more than 0.02%
THD (in Stereo mode).
Model: Reference 2
50/60 Hz AC Volts: 120 Current: 8.8 Amps
Maximum Output: 560 watts per channel into
4 ohms at 1 kHz with no more than 0.02% THD
(in Stereo mode).
®INTERNATIONAL, INC.
ELECTRONIC EQUIPMENT
ELKHART, IN 46517
MADE IN U.S.A.
SERIAL NUMBER
0000
000000
Programmable
Input Processor (P.I.P.)
3
12
GND
INPUT INPUT
CH-2 CH-1
PUSHPUSH
FX
OFF

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