Crown studio reference ii 仕様ガイド

Crown International

1718 W. Mishawaka Rd.

Elkhart, IN 46517-9439

TEL: 574-294-8200

FAX: 574-294-8FAX

www.crownaudio.com

STUDIO

REFERENCE

04/05 138314-1

Speciﬁcations subject to change without prior notice. Latest

information available at www.crownaudio.com.

Crown and Crown Audio are registered trademarks of Crown

International, Inc. Printed in U.S.A.

, Inc.

Architectural & Engineering Speciﬁcations

S T U D I O R E F E R E N C E S E R I E S

Studio Reference II (120 V, 60 Hz models)

The Crown

Studio Reference II power ampliﬁer shall be a solid-state two-

channel model employing multi-mode (AB+B) grounded bridge(TM) output

circuitry with a variable impedance (VZ) power supply for each channel.

The outputs shall be switchable as stereo, bridged-mono or parallel-mono

modes of operation. The bridged-mono mode shall bridge the outputs to

provide increased output voltage. The parallel-mono mode shall parallel the

outputs to provide increased output current.

The output impedance of each channel shall be less than 10 milliohms in

series with less than 2 microhenries in stereo mode.

The variable impedance power supplies shall reduce unnecessary voltage

across the output devices by automatically switching to a parallel mode

when less voltage is required by the output circuitry and to a series mode

when more voltage is required.

The ampliﬁer shall contain protection circuitry which limits the drive level

placed on the output devices before their SOA (Safe Operating Area) is

exceeded. This protection circuitry shall calculate the instantaneous volt-

age across and current through the output devices while factoring in their

simulated junction temperatures to predict how close they are to their

operating limits. This protection will be called “ODEP.”

The ampliﬁer shall contain controlled slew-rate voltage circuitry to protect

it against radio frequency interference burnouts. It shall also be protected

from current overload at its output stage. The slew rate of the ampliﬁer

shall be greater than 30 volts per microsecond in stereo mode.

The ampliﬁer shall temporarily go into a stand-by mode if its power trans-

former becomes excessively hot and shall automatically resume normal

operation once it has cooled to a safe operating temperature.

Front-panel controls shall include an enable on/off switch and a detented

input level control for each channel.

Rear-mounted controls shall include a ground lift switch to isolate the

signal ground from the chassis ground, a switch which selects between

stereo, bridged-mono and parallel-mono modes of operation and a reset

switch for the AC mains circuit breaker.

Internal controls shall include an input sensitivity switch to select between

0.775 V, 1.4 V or a ﬁxed voltage gain of 26 dB for full rated output.

A Crown P.I.P. and P.I.P.2-compatible expansion connector shall be pro-

vided behind an access panel in the rear to accept auxiliary input modules.

It shall be fully compatible with the Crown IQ System.

Front panel indicators shall include an amber power enable indicator, an

amber ODEP protection system indicator for each channel which shall

normally be illuminated to conﬁrm the availability of reserve thermody-

namic energy and which shall dim in proportion to limiting when the power

demands of the output stages have been exceeded, a green IOC indicator

for each channel, and a green Signal indicator for each channel which shall

normally ﬂash at moderate intensity to show the presence of an audio

signal.

The power ampliﬁer shall meet or exceed the following performance

criteria. Input sensitivity for rated output: 26 dB voltage gain (unbalanced).

Rated FTC output in stereo mode with less than 0.1% THD: 355watts per

channel (20 Hz to 20 kHz) into 8 ohms. Hum and noise: at least 120 dB

(A weighted) below full rated output power. Phase response: +5 to –15

degrees from 20 Hz to 20 kHz at 1 watt. Frequency response: 20 Hz to 20

kHz, 0.1 dB at 1 watt into 8 ohms per channel in stereo mode. Damping

factor: greater than 20,000 from 10 to 200 Hz into 8 ohms. Intermodula-

tion distortion (SMPTE): less than 0.005% from full bandwidth power to

78 watts rising linearly to better than 70 dB at 20 kHz. Harmonic distortion:

less than 0.02% at rated low-distortion 1 kHz power.

The ampliﬁer shall be safe when driving any kind of load—even highly

reactive ones.

The power requirements shall be 120 VAC at 60 Hz. At idle, the ampliﬁer

shall draw 90 watts or less.

The ampliﬁer chassis shall be constructed of steel with a durable black

ﬁnish and shall be designed for ﬂow-through fan-assisted ventilation from

the front panel to the side panels. The ampliﬁer shall have an aluminum

front panel with super-gloss Imron ﬁnish and Lexan overlay.

The dimensions of the ampliﬁer shall allow for 19 inch (48.3 cm) EIA

standard (RS-310-B) rack mounting. The ampliﬁer shall be 7 inches (17.8

cm) tall, 16 inches (40.6 cm) deep behind the rack-mounting surface, and

2.75 inches (7 cm) in front of the rack-mounting surface.

The ampliﬁer shall weigh 56 pounds, 2 ounces (25.5 kg) and shall have a

center of gravity approximately 6 inches (15.2 cm) behind the front panel.

The ampliﬁer shall be designated the Crown Studio Reference II.