I-Tech HD Series Power Amplifiers

4 Advanced Operation

4.8.10 Crossover Filters

The Crossover section lets you use infi nite impulse response (IIR) or fi nite impulse response (FIR) fi lters for the crossover.

FIR advantages: FIR has a longer processing latency but has less phase artifacts compared to IIR. FIR allows for brickwall, 48dB/oct and 24dB/octave fi lters.

IIR advantages: FIR has one processing block per channel; IIR has one or more. For example, you can place an FIR at only one end of a channel, but you can place an IIR at either end.

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The amplifi er contains two FIR blocks which can be used in various confi gurations:

•2x2 mode: One FIR fi lter per channel can be used.

•Bridge mono mode: Both FIR fi lters can be used.

•1x2 mode: Two modes are available – Duplicate or Unique. In Duplicate mode the same settings are used on both channels, allowing two FIR

fi lters per bandpass. In Unique mode the FIR fi lters are limited to one per bandpass. However, if the High Pass of Channel 1 and Low Pass for Channel 2 are set to identical slopes and frequencies, you can use FIR on all the bandpasses. The logic for this operation is built into the software controls. In addition, the Processing (FIR) latency sets the minimum frequency that can be set for an FIR.

A polarity inverter button lets you change the polarity of each channel independently.

Each audio channel has three separate places where fi lters can be placed in the system: input EQ (16 fi lters), Crossover, and Output EQ. Up to 24 fi lters per channel are available, plus crossover fi lters and 4 fi lters for the signal generator. Each fi lter has up to +/-24dB of gain. The following fi lters are available:

•Lowpass: Bessel 2-4, Butterworth1-4, and Linkwitz-Riley 8

•Highpass: Bessel 2-4, Butterworth1-4, and Linkwitz-Riley 8

•Lowshelf: Low-frequency shelving EQ

•Highshelf: High-frequency shelving EQ

•Lowpass EQ: Variable bandwidth, can be expressed as Q (0.100 to 35) or Octaves (0.041 to 6.672)

•Highpass EQ: Variable Q from 0.1 to 25

•Parametric EQ: Variable Q form 0.1 to 35

Operation Manual

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Crown Audio I-T5000 HD, IT9000 HD, I-T12000 HD, I-T9000 HD operation manual Crossover Filters
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I-T9000 HD, I-T12000 HD, IT9000 HD, I-T5000 HD specifications

Crown Audio has established itself as a leader in the audio amplification industry, and its IT series, including the IT9000 HD, I-T9000 HD, I-T5000 HD, and I-T12000 HD, exemplifies this commitment to quality and innovation. These amplifiers are engineered to deliver exceptional audio performance, reliability, and user-friendly operation, making them ideal for a variety of applications, from concert sound to installed audio systems.

The IT9000 HD is a powerhouse that provides robust performance through its high-efficiency design. Featuring advanced Class I technology, it can deliver a staggering output of up to 9000 watts. This model is built with a lightweight, compact chassis that allows for easy installation and portability. The IT9000 HD incorporates Crown’s proprietary DriveCore technology, which combines the amplifier’s driver and output stage into a single chip, significantly increasing efficiency and reducing the overall size of the amplifier.

Next in line, the I-T9000 HD offers similar power output capabilities but adds flexibility with its network connectivity options. This model supports the latest in digital signal processing, allowing users to tailor their audio system with precision. It also features intelligent fan cooling technology that adjusts the fan speed based on heat generation, ensuring optimal performance under varying load conditions.

The I-T5000 HD stands out with its unique ability to deliver a maximum of 5000 watts, making it an ideal choice for smaller venues or mobile applications where power-to-weight ratio is critical. It shares many of the technological advancements of its larger counterparts, including enhanced DSP capabilities and comprehensive monitoring via onboard indicators and remote software control.

Lastly, the I-T12000 HD is the flagship model in this series, capable of an impressive 12000 watts output. It boasts advanced power management features and offers multiple operating modes, including stereo and bridged operation. The I-T12000 HD is designed for the most demanding applications, ensuring ultra-reliable performance and pristine sound quality in even the largest spaces.

All models in the Crown IT series feature a rugged construction for durability, along with intuitive front-panel controls for easy operation. They also include comprehensive network control options, allowing users to manage and monitor their systems remotely via DSI (Digital Signal Interface) and DSP capabilities.

In conclusion, Crown Audio's IT9000 HD, I-T9000 HD, I-T5000 HD, and I-T12000 HD amplifiers represent the pinnacle of amplifier technology, delivering unmatched performance, efficiency, and versatility for a wide range of audio applications. Whether for live events or permanent installations, these amplifiers provide the power and reliability necessary to meet the demands of modern audio environments.
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