Crown Audio I-Tech Series Advanced Operation, I-TechSeries Power Amplifiers, page, User Presets

I-Tech Series Power Amplifiers

4 Advanced Operation

4.3 Presets

4.3.1 Introduction

Your I-Tech amplifier has a wide variety of onboard Digital Signal Process- ing (DSP). Some applications for this DSP are speaker configuration (set- ting the drive levels, frequency bands, delays and limiting for your particular speakers), EQ, filtering, compression, and much more. Those functions are described in Section 4.6. IQwic or System Architect software lets you adjust the DSP settings, such as filter slope, compression ratio, EQ frequency bands, and so on.

A preset is a group of DSP settings that configure the amp for a specific application. For example, you might use one preset that optimizes the amp’s DSP for a JBL Vertec Line Array. You might use another preset that sets up the DSP for a stereo pair of loudspeakers of your choice. You can choose any of 20 presets with the LCD Control Screen.

The I-Tech amplifier works with two types of presets:

1.User presets. Using IQwic or System Architect, you can create your own custom DSP presets, label them, and send them to the I-Tech ampli- fier. The amp stores those presets in firmware. You can recall those presets from the LCD Control Screen.

2.Downloadable presets. Crown and JBL engineers have designed presets that are optimized for various JBL loudspeakers, such as Vertec Line Arrays. You can download presets from http://www.crownaudio.com/ amp_htm/itech-download.htm. Then in the software, send the preset files to the I-Tech amplifier, where you can recall them from the LCD Control Screen.

We will describe each type of preset in detail.

4.3.2 User Presets

User presets are DSP presets that you set up. This is the basic procedure:

1.Adjust the DSP settings as desired in the IQwic or System Architect soft- ware (not with the LCD Control Screen).

2.Save this group of settings as preset. Give it a label.

3.Download the preset to the I-Tech amplifier. See the software Help file for details. Basically, you will open and engage a data frame.

4.Select that preset from the LCD Control Screen. The preset will automat- ically set the DSP parameters as you set them up in IQwic.

Setting the parameters of the DSP in the I-Tech amplifier is done using the control software, not by the amplifier’s LCD Control Screen. For example, if you want to set filter Q, compression ratio, or graphic EQ, you would do so within the IQwic software.

After setting the DSP parameters as desired,

1.Save them as a preset in the software. Presets are stored and recalled through the Presets Page in IQwic. See the Presets Help file in IQwic for details. In System Architect, Presets are stored and recalled from the main panel. Descriptions are edited on the General page.

2.Download the preset to the I-Tech amplifier. See the Help file for details. Basically, you will open and engage a data frame.

3.When you want to recall the preset, select it on the LCD Control Screen.

4.3.3 Downloadable Presets

Crown and JBL engineers have designed I-Tech DSP presets that are opti- mized for various JBL loudspeakers, such as Vertec Line Arrays. To use them, follow this procedure in IQwic:

1.Go to the I-Tech website at www.crownaudio.com/itech/.

2.Select Downloads.

3.Click on the file of your choice. It will download to your computer.

4.In IQwic, select File > Open. Browse to the downloaded preset file and open it.

5.In IQwic, see the Help file on Presets for details on downloading the pre- set to an I-Tech amplifier. Basically, you will open and engage a data frame. The file will overwrite the preset you designate.

6.Recall the preset from the LCD Control Screen. Then your amp will be configured to work with the specified loudspeaker model.

4.4 Digital Audio Options (AES/EBU)

Digital audio inputs allow you to keep the amplifier input signals in the digital domain. Keeping the input signal digital reduces the number of Dig- ital-to-Analog and Analog-to-Digital conversions. This provides better sound quality and reduces pickup of electrical interference.

The AES/EBU connector provides the most widely accepted format. Con- nect an AES/EBU signal to the AES/EBU connector on the rear panel.

Operation Manual page 23