Chapter 1: Crown Amplifiers In-Depth

17

Figure 1.25

Inductive Load (Trans- former) Network

4. Never connect the amplifi er’s input and output grounds together.

5. Never tie the outputs of multiple amplifi ers together.

6. Keep loudspeaker cables well separated from input cables.

7. Install a low-pass fi lter on each

input line (similar to the RF fi lters described in Section 1.2.2).

8.Install input wiring according to the instructions in your amplifi er’s Opera- tion Manual.

Figure 1.26

Typical Distributed Speaker System

Sub-Sonic Currents

Another problem to avoid is the presence of large sub-sonic currents when primarily inductive loads are used. Examples of inductive loads are 70-volt transformers and electro- static loudspeakers.

Inductive loads can appear as a short circuit at low frequencies. This can cause the amplifi er to pro- duce large low-frequency currents and activate its protection circuitry. Always take the precaution of install- ing a high-pass fi lter in series with the amplifi er’s input when inductive loads are used. A 3-pole, 18-dB- per-octave fi lter with a –3 dB fre- quency of 50 Hz is recommended (depending on the application, an even higher –3 dB frequency may be desirable).

Another way to prevent the amplifi er

from prematurely activating its protection systems and to protect inductive loads from large low-frequency currents is to connect a 590 to 708 µF nono- larized capacitor and 4-ohm, 20-watt resistor in series with the amplifi er’s output and the positive (+) lead of the transformer. The circuit shown in Figure 1.25 uses components that are available from most electronic supply stores.

1.3.6 Distributed Speaker Systems

Multiple-speaker systems for paging and background music systems are common in such facilities as schools, restaurants, industrial facilities offi ces and retail. In these systems, many speakers are distributed throughout the facility, often across long distances, making them diffi cult and expensive to implement with traditional, direct low-impedance amplifiers. A less expensive and more reliable method is the distributed speaker system.

A distributed speaker system consists of an amplifier or amplifi er channel driving one or more speakers with transformers connected to a pair of wires called a “home run.” The transformers step the line voltage down to a lower

Amplifier Application Guide

Page 16 Page 18
Page 17
Image 17
Crown Audio 133472-1A manual Distributed Speaker Systems, Sub-Sonic Currents
Page 16 Page 18

133472-1A specifications

Crown Audio 133472-1A is a sophisticated and highly regarded power amplifier designed for professional audio applications. Known for its reliability and high performance, the 133472-1A is favored by sound engineers, musicians, and event organizers who seek exceptional audio clarity and robust amplification.

One of the standout features of the Crown Audio 133472-1A is its impressive power output. This amplifier is capable of delivering substantial wattage, ensuring that it can effortlessly drive a variety of loudspeaker systems without distortion, even at high volumes. This makes it particularly suitable for large venues, concerts, and public gatherings where sound coverage is critical.

The 133472-1A utilizes advanced technologies to enhance its performance. For instance, it incorporates a patented output stage design that minimizes distortion, allowing for a cleaner and more accurate sound reproduction. This is especially important in professional audio environments where audio fidelity is paramount. Additionally, the amplifier features sophisticated thermal management systems that prevent overheating, ensuring reliable operation during extended use.

Another key characteristic of the Crown 133472-1A is its versatility. It is engineered to work seamlessly with a range of audio sources, making it an ideal choice for various applications, including live performances, installations, and broadcasting. Its multiple input options, including XLR and TRS connectors, allow for flexible connectivity options, accommodating various audio setups.

Durability is also a significant aspect of the Crown Audio 133472-1A. Constructed with high-quality materials and robust components, this amplifier is built to withstand the rigors of professional use. Its rugged chassis design provides added protection, making it suitable for both touring and fixed installations.

Furthermore, the Crown 133472-1A offers user-friendly features such as intuitive controls and indicators, allowing users to monitor performance easily. This includes LED status indicators that provide real-time feedback on operation, making it simple to troubleshoot any issues.

In summary, the Crown Audio 133472-1A is a powerhouse amplifier that combines high output, advanced technologies, and durable construction. Its versatility makes it a preferred choice for professionals seeking reliable and superior audio performance in live and installed environments. Whether for music events, speeches, or any high-stakes audio requirements, the 133472-1A delivers the quality and performance essential for exceptional sound.
Top Page Image Contents