Crown Audio CL1 User Manual

Architectural & engineering speciﬁcations

Crown Audio, Inc.

P.O. Box 1000

Elkhart, IN 46515-1000

TEL: 574-294-8200

FAX: 574-294-8FAX

www.crownaudio.com

CL1

7/03

131956-1A

Speciﬁcations subject to change without prior notice. Latest

information available at www.crownaudio.com.

Crown

is a registered trademark of Crown International, Inc.

Printed in U.S.A.

Architectural & Engineering Speciﬁcations

C O N T R A C T O R S E R I E S

CL1 (120V, 60 Hz models)

The ampliﬁer shall be a solid-state two-channel model. Each ampliﬁer

channel shall have the ability to operate individually, or paired with the

other channel in a bridged conﬁguration to provide increased output volt-

age over that of an individual channel output.
Front panel controls shall include a rocker switch for selecting power on

and off. Rear panel controls shall include a recessed detented rotary control

for each channel to adjust input level, a recessed switch to select Stereo

or Bridge modes of operation, and a reset switch for the AC mains circuit

breaker.
Internal controls shall include a jumper block to allow selection of input

sensitivity of either 0.775V or 26 dB gain as a service option. Sensitivity

shall be factory-set to 1.4V.
Front panel indicators shall include a green LED to indicate that the ampli-

ﬁer is turned on and power is applied; a red LED for each channel which

shall blink to indicate any of the following 5 conditions: 1) When the

ampliﬁer is ﬁrst powered up, until the unit is ready for operation. 2) If

the heatsinks reach a temperature above normal working limits. 3) If the

transformer thermal protection circuit is activated. 4) If the ampliﬁer wires

develop a short circuit, and 5) should the ampliﬁer output stage become

non-operational; a red LED for each channel which shall turn on to indicate

when distortion of any type becomes audible in the ampliﬁer output; and

a green LED for each channel which shall ﬂash dimly to indicate when a

low-level signal (> -40 dBm) is present at the input of the ampliﬁer.
Rear-panel connectors shall include a combination XLR and ¼-in (6.35 cm)

phone connector in parallel with a three-terminal barrier block for each

channel for balanced input connection (on the standard input module);

a four-terminal touch-proof barrier block for output connection (on the

standard output module); and an RJ11 jack for connection to an external

circuit for the purpose of remotely monitoring fault conditions.
The ampliﬁer power requirements shall be 120 VAC, 6.3 A at 60 Hz. A

detatchable IEC 15A to NEMA 5-15P AC line cord shall be provided for AC

connection. Typical quiescent power draw shall be 60 watts.
The ampliﬁer chassis shall be constructed of steel with a durable black

ﬁnish. The ampliﬁer shall employ a cooling system consisting of internal

heat exchangers, along with a variable-speed cooling fan which shall oper-

ate according to internal thermal demand. Airﬂow through the chassis shall

be from front to rear.
The dimensions of the ampliﬁer shall allow for 19 inch (48.3 cm) EIA Stan-

dard (RS-310-B) rack mounting. The ampliﬁer shall be 5.25 inches (13.34

cm) tall and 12.25 inches (31.11 cm) deep behind the rack-mounting

surface. The ampliﬁer shall weigh 32.6 pounds (14.79 kg).
The ampliﬁer shall be protected against shorted, open or mismatched

loads; overloaded power supplies; excessive temperature; chain destruc-

tion phenomena; input overload damage; and high-frequency blowups.

The ampliﬁer shall protect loudspeakers from input/output DC, large or

dangerous DC offsets and turn-on/turn-off transients.
Input Impedance of the ampliﬁer shall be nominally 20 k ohms, balanced;

nominally 10 k ohms, unbalanced.
The power ampliﬁer shall meet or exceed the following performance criteria

(ampliﬁer in stereo mode with 8 ohm loads and an input sensitivity of

26 dB gain, 1 kHz at rated power unless otherwise speciﬁed): Load imped-

ance (safe with all types of loads): 2, 4 & 8 ohm Stereo; 4, 8 & 16 ohm

Bridge. Voltage gain, 1 kHz, 1.4V sensitivity: 30.5 dB at 4/8 ohm. Output

Power at 1 kHz at rated THD; in Stereo mode at 8 ohms: 275 watts per

channel; in Stereo mode at 4 ohms: 450 watts per channel; in Stereo mode

at 2 ohms: 560 watts per channel; in Bridge mode at 8 ohms: 900 watts;

in Bridge mode at 4 ohms: 1,100 watts. Frequency Response, 20 Hz to 20

kHz at 1 watt: ±0.1 dB. Phase Response: ±15 degrees deviation from linear

phase from 20 Hz to 20 kHz at 1 watt. Signal to Noise Ratio, A-Weighted:

Better than 105 dB below rated 1-kHz power. Total Harmonic Distortion

(THD), 1 kHz at rated power: 0.5% or less true THD from 20 Hz to 20 kHz.

Intermodulation Distortion (60 Hz and 7 kHz at 4:1): Less than 0.1% at

rated power to 30 dB below rated power at 8 ohms. Damping Factor (8

ohm): Better than 400 from 10 Hz to 400 Hz. Crosstalk, 20 Hz to 20 kHz:

Better than 50 dB below rated power. Common Mode Rejection (CMR):

Better than 40 dB from 20 Hz to 1 kHz. DC Output Offset (Shorted Input):

±10 mV.
The ampliﬁer shall be designated the Crown CL1.