Crown-audio I-T4000 Manuel d'utilisateur télécharger pdf

Crown International

1718 W. Mishawaka Rd.

Elkhart, IN 46517-9439

TEL: 574-294-8200

FAX: 574-294-8FAX

www.crownaudio.com

I-T4000

The power ampliﬁ er shall be a solid-state two-channel model employing

Class I (BCA

) output circuitry.

The ampliﬁ er shall contain protection from shorted, open and mismatched

loads, general overheating, DC, high-frequency overloads, under/over volt-

age, and internal faults.

If an ampliﬁ er channel starts to overheat, the Thermal Level Control (TLC)

circuit shall engage that channel’s input compressor in an amount propor-

tional to the amount of overheating, in order to generate less heat. If the

channel becomes too hot for safe operation, the channel shall shut off,

and the Thermal Indicator for that channel shall illuminate brightly to alert

the user that a state of thermal stress or overload has caused the channel

to shut down.

The front-panel controls shall be a power switch, Menu/Exit button, Previ-

ous button, Next button, Encoder 1 knob and Encoder 2 knob (Channel

Level Controls).

Rear-mounted controls shall include a reset switch for the circuit breaker.

The recommended load impedance in Dual mode shall be 1/2/4/8/16 ohms.

The load impedance in Bridge-Mono mode shall be 2/4/8/ ohms. The

ampliﬁ er shall be safe when driving any kind of load, including highly

reactive ones.

The rear-mounted output connectors shall be two high-current, 50A Neutrik

Speakon NL4MLP (mates with NL4FC or NL4)(one per channel), two pairs

of high-current, 60A color-coded 5-way binding posts (for banana plugs,

spade lugs or bare wire), two male XLR passive analog loop-through

connectors, and one XLR active/re-clocked AES/EBU digital loop through

connector.

The rear-mounted input connectors shall be a 3-pin female XLR analog

input connector for each channel, and a 3-pin female XLR digital input

connector that accepts a digital signal in the AES/EBU format.

The rear-mounted Ethernet connector accepts an RJ-45 connector for

HiQnet™ or TCP/IQ™ networking and optional CobraNet™ transport from

a standard network cable. Built into the connector shall be a yellow LINK

ACTIVITY indicator that shows network activity, and a green 100Mb indica-

tor that shows a 100Mb network connection.

The rear-mounted Data indicator shall be a yellow LED that indicates con-

trol data activity. The rear-mounted Preset indicator shall be a yellow LED

that ﬂ ashes to signal the number of the current preset if active.

The I-T4000 shall be fully compatible with Harman Pro System Archi-

tect and the Crown

System

and HiQnet or TCP/IQ networks. The

I-T4000CN shall be compatible with CobraNet networks.

Front panel indicators shall include an LCD Control Screen with white LED

backlight to control the ampliﬁ er’s setup and operation, a yellow Bridge-

Mode Indicator that illuminates when the ampliﬁ er is set to Bridge-Mono

mode, a green Ready Indicator (one per channel) that illuminates when the

channel is initialized and ready to produce audio output and is off when

the ampliifer is in standby mode via the control software, a green Signal

Indicator (one per channel) that illuminates to indicate the presence of

input signals above –40 dBu, a red Clip Indicator that illuminates when

the THD of the channel’s output signal reaches the onset of audible clip-

ping (and illuminates during Thermal Level Control (TLC) limiting, a red

Thermal Indicator (one per channel) that illuminates when the channel has

shut down due to thermal stress or overload, a red Fault Indicator (one

per channel) that ﬂ ashes when the ampliﬁ er output channel has stopped

operating, a yellow Data Indicator that ﬂ ashes during network data activity,

I-T4000

6/05 137252-1E

, Inc.

Speciﬁ cations subject to change without prior notice. Latest

information available at www.crownaudio.com.

Crown, Crown Audio, BCA, and IQ System are registered trade-

marks of Crown International. HiQnet is a trademark of Harman

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

Architectural & Engineering Speciﬁ cations

I-TECH SERIES

a blue Power Indicator that illuminates when the ampliﬁ er has been turned

on and AC power is available (and ﬂ ashes when the AC line voltage is 15%

above or below the nominal rated value), and a green AC Mains Present

Indicator in the power switch that indicates AC power is present at the

power cord.

The ampliﬁ er shall include onboard DSP with 24-bit conversion and 32-bit

ﬂ oating-point processing, DSP presets in ﬁ rmware and downloadable, load

supervision, error reporting, and a global power supply with Power Factor

Correction.

The power ampliﬁ er shall meet or exceed the following performance crite-

ria. Input sensitivity for rated output: adjustable in 0.1V steps from 1.4V to

7.75V. Voltage gain: 37.1 dB to 22.2 dB. Rated output with both channels

driven in Dual mode with 0.35% THD (20 Hz to 20 kHz): 1800 watts per

channel into 2 ohms, 2000 watts per channel into 4 ohms, and 1250 watts

per channel into 8 ohms. Rated output in Bridge-Mono mode with both

channels driven at 0.35% THD (20 Hz to 20 kHz): 3600 watts into 4 ohms

and 4000 watts into 8 ohms. Frequency Response at 1 watt, 20 Hz to

20 kHz: ±0.25 dB. Signal to Noise Ratio below rated power, A-weighted:

greater than 105 dB. Total Harmonic Distortion at full rated power: less

than 0.35%. Intermodulation Distortion (60 Hz and 7 kHz at 4:1, from full

rated output to –35 dB): less than 0.35%. Damping Factor (20 Hz to 100

Hz): greater than 5000. Crosstalk (below rated power, 20 Hz to 1 kHz):

greater than 80 dB. Common Mode Rejection (20 Hz to 1 kHz): greater

than 50 dB. DC Output Offset: less than ±3 mV. Input Impedance (nominal):

20 kilohms balanced, 10 kilohms unbalanced. Maximum Input Level: +15

dBu or +21 dBu, depending on input sensitivity. Latency (analog, digital

inputs): 1.13 mS analog, 1.81 mS digital (96 kHz).

The ampliﬁ er chassis shall be constructed of aluminum with a durable

silver ﬁ nish and shall be designed for dual-zone, microprocessor con-

trolled, continuously variable-speed forced-air ventilation from the front

panel to the back panel.

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

standard (RS-310-B) rack mounting. The ampliﬁ er shall be 3.5 inches

(8.9 cm) tall, and 16.2 inches (41.1 cm) deep behind the rack-mounting

surface.

The ampliﬁ er shall weigh 28 pounds (10.5 kg).

The ampliﬁ er shall be designated the Crown I-T4000.

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Crown International1718 W. Mishawaka Rd.Elkhart, IN 46517-9439TEL: 574-294-8200FAX: 574-294-8FAXwww.crownaudio.comI-T4000 The power ampliﬁ er shall be

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Crown-audio I-T4000 Manuel d'utilisateur

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