I-Tech HD Series Power Amplifiers

9.2 A Closer Look at CobraNet

Licensed by Cirrus, CobraNet is a protocol, fi rmware and hardware that lets you trans- mit digital audio over a 100Base-T Fast-Ethernet network.

This section provides an overview of CobraNet. Cirrus Logic has provided a number of technical papers that describe CobraNet in detail. These papers are available at: http://www.cobranetinfo.com.

9.2.1 Fast Ethernet (100Base-T)

Fast Ethernet (100Base-T) runs at 100Mbps (Megabits per second). It uses a hub or network switch to interconnect all network nodes (components). This forms a star network (see Figure 9.1). In a star network, all PCs are connected to a centralized hub or switch. Messages are sent from the originating PC to the hub, which then transmits the message either to the whole network or, if a switched hub (network switch) is used, to the destination device only.

In larger Fast Ethernet networks, additional hubs, concentrators, and other network hardware are used to form a larger network, as shown in Figure 9.2.

Figure 9.3 Star Topology

Today, commonly available networking cards are 10/100Base-T capable, which allows them to be used on either 10BaseT or 100Base-T networks.

The maximum length of cable for CobraNet is the same as for Ethernet:100 meters over CAT-5 copper cable, 2 kilometers over multimode fi ber. Proprietary “Fast Ethernet via single mode fi ber” networks can reach even further.

9.2.2 Audio Specs

Sample rate: CobraNet can handle sample rates of 48 kHz or 96 kHz. I-Tech HD is switchable between 48 kHz and 96 kHz.

Bit depth: Set each channel to transmit 16-, 20- or 24-bit audio data as desired.

Latency: The transmitter and receiver buffers required for reliable transmission are set to 256 samples as a default. This gives a network transmission latency of 5.333 mS (256 samples at 1/48 kHz per sample). I-Tech HD latency is switchable between 1.33, 2.66, and 5.33 mS.

9.2.3 Bundles and Audio Channels

You assign all audio channels to groups called Bundles for transmission over the

CobraNet network. Bundles were formerly called Network Channels.

A bundle can carry up to 8 audio channels. Up to 8 bundles can be sent in a 100 Mbps line, depending on the signal’s bit depth and sampling rate. Only 4 bundles are avail- able when 96 kHz sampling rate is in use.

Figure 9.4 Multi-Star Topology

The usual assignment is 8 channels at 20 bits. You can use fewer channels per bundle, but maximum size bundles are suggested for the most effi cient use of network band- width. If 24-bit data is desired, then only 7 audio channels can be loaded into a single Bundle. With a 96 kHz sample rate, only 4 channels of audio are available.

Operation Manual

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Crown Audio I-T9000 HD Closer Look at CobraNet, Fast Ethernet 100Base-T, Audio Specs, Bundles and Audio Channels
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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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