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-
fi er—an unsurpassed industry standard. With this unprecedented No-Fault protection, your new
Crown amplifi er is warranted to meet or exceed original specifi cations for the fi rst three years of
ownership. During this time, if your amplifi er fails, or does not perform to original specifi cations,
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 amplifi er.
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.
Specifi cations 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 amplifi er
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 fl ashes synchronously
with the channel’s output signal to indicate its
presence.
Enable Indicator: This indicator lights when the
amplifi er has been “enabled” or turned on, and
AC power is available.
ODEP Indicators: During normal operation of
the amplifi er, 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 amplifi er 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
fl ashes if any type of distortion reaches 0.05%.
Dynamic Range/Level Meters: A fi ve-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: Confi gurable 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 amplifi ers 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 amplifi er
damage in virtually any situation. A four-second
turn-on delay prevents power-on thumps.
Construction
Durable black fi nish 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
