Hollywood 24CX-4, 24CX-3, 24CX-2 owner manual Introduction, Crossover Fundamentals

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Introduction

Thank you for purchasing the TDM 24CX series electronic crossover. These units are made from the finest components and engineered to exacting standards. Precision components are used in all critical circuitry for the finest sonic quality and performance. To get the most out of your new crossover, please take a few minutes to review this manual and familiarize yourself

with the proper operation of the unit.

The remainder of this section provides background information about the theory of crossover operation. Individuals that do not need this information may skip directly to the next section: Mounting the Unit in a Rack.

Crossover Fundamentals

A crossover is used to divide a full-range sound signal into one or more frequency bands for reproduction. This is necessary because most speaker components are designed to reproduce only a portion of the audible frequency spectrum. A speaker system is made up of a collection of speaker components, each of which can reproduce some part of the spectrum. The crossover’s role is to divide the full-range sound source into the frequency bands appropriate to each of the components in the speaker system.

Almost all sound reproducing systems have crossovers. In the majority of systems, including most home and car stereo systems, and many commercial systems, the crossovers are in the speaker cabinets. A speaker cabinet typically contains two or three, and sometimes even four or five different kinds of components. In some cases a single component is duplicated. For instance, some cabinets have more than one low-frequency driver to increase low-frequency power- handling ability and efficiency. The full-range power signal that is fed into a speaker cabinet goes through a crossover that splits it into the different bands. The outputs of the crossover are connected to each of the different speaker components to create a complete system. Figure 1 illustrates this configuration.

© 2003 TDM Audio, Inc.

Electronic Crossover Owner’s Manual

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Contents TDM Read Before Using Table of Contents Introduction Crossover FundamentalsSignal Source Power Amplifier Passive Crossover Shows a typical active crossover configuration Crossover TerminologyHow Crossovers Work Filter Frequency Response Curve24 dB per Octave Filter Curve Three-Way Crossover Response Using the Security Cover Mounting the Unit in a RackWhat You’ll Need Hooking Up the CrossoverMaking Adapter Cables Two-Way Operation 24CX-2 or 24CX-4 Basic Hook-UpThree-Way Operation 24CX-2 or 24CX-4 Three-Way Operation 24CX-3 Four-Way or Five-Way Operation 24CX-4Operating the Crossover Front Panel ControlsAdjusting the Crossover Frequencies Three-Way Control MeaningsUsing the CD Horn Boost Checking the HookupAdjusting the Output Levels Adjusting the Input LevelsTDM Option Cards Optional Output Limiters No Signal Output Troubleshooting and SupportDistortion Excessive Noise Hertz Hum or BuzzContacting TDM Specifications 24CX-2, 24CX-4
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