Crown 1160ma Manual Suplementario

Crown Audio, Inc.

P.O. Box 1000

Elkhart, IN 46515-1000

TEL: 574-294-8200

FAX: 574-294-8FAX

www.crownaudio.com

CH4

7/03 

131955-1A   

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.

© 2003 Crown Audio, Inc.

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. The outputs shall be switch-

able for either low impedance (standard speaker load) or high impedance 

(distributed speaker line) operation. When in 70V (high impedance) opera-

tion, a 70 Hz high-pass filter shall be employed in the signal chain to 

prevent step-down transformer saturation.
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, a recessed switch to select 4/8 ohm or 70V 

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 each channel for output connec-

tion (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 100-240 VAC, at 50/60 Hz. AC 

line current requirement shell be 8.5 A at 100 VAC; 7.1 A at 120 VAC; 

and 3.7 A at 230-240 VAC. A detatchable IEC 15A to NEMA 5-15P AC line 

cord shall be provided for AC connection. Typical quiescent power draw 

shall be 140 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 16.25-inches (36.56-cm) deep behind the rack-mounting 

surface. The amplifier shall weigh 33.3 pounds (15.1 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 and 8 ohm Stereo; 4 ohm at 70V 

Stereo; 4, 8 and 16 ohm Bridge; 8 ohm at 140V Bridge. Voltage gain, 1 kHz, 

1.4V sensitivity: 34 dB at 4/8 ohm and 70V. Output Power at 1 kHz at rated 

THD; in Stereo mode at 8 ohms: 600 watts per channel; in Stereo mode at 4 

ohms: 1,200 watts per channel; in Stereo mode at 2 ohms: 1,400 watts per 

channel; in Stereo mode, 70V operation: 1,200 watts per channel; in Bridge 

mode at 8 ohms: 2,400 watts; in Bridge mode at 4 ohms: 2,800 watts;  

in Bridge mode, 140V operation: 2,400 watts. Frequency Response, 20 Hz 

to 20 kHz at 1 watt: ±0.25 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 102 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 

0.5%  at rated power to 30 dB below rated power at 8 ohms. Damping 

Factor (8 ohm): Better than 700 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 CH4.