This site provides basic knowledge of PA (public address) system building.
Recording studios, concert PA (SR) systems, and television and radio broadcast systems are not covered.

Product Basics

There are contents about individual devices and basic combinations.
On the left there are articles about input devices such as microphones, and on the right there are articles about output devices such as amplifiers and speakers.

Microphone

Type of MIC

MIC spec

Proximity Effect

Wireless

Wireless Basic Features

Multiple Channne Usel and Interference

How Antenna should be installed

Interference & D/U

Mixer/Matrix

What's Mixer and Matrix ?

Specific examples

Priority and Mixing

How is the Matrix controlled?

DSP

Output Structure

HiZ & LoZ; number of SP & AMP

AMP & SP unit configration

AMP

Type of AMP

AMP spec

Speaker

Type of SP

Line array

SP spec

Audio Signal

Frequency and Frq. Response

Digital Audio Sauce

Line-level Connection

Control

Control

Power

​

Basic PA system - summary -

Design Procedure

Field & Hearing

Ambient Noise

STI

Sound attenuation by distance

Problem of sound

​
​System Design

There are contents related to system design.
This section explains how to design a system using the basic knowledge of the products described above.
"PA system" mainly covers broadcasting equipment for the entire building, and "Sound System" covers local systems for speech.

Difference between PA system and Sound system

.

PA system for Building Broadcasting

This section contains knowledge about system design for voice evacuation, commercial announcement broadcasting, background music, etc.

Audio Route Structure

Emergency Broadcast Orverview

Input

MIC

PA MIC

Other Input

Sound Source

Output Structure

Type of SP line and Attnuator

SP and location

SP grouping

How to place CeilingSP

Is there a ceiling there ?

Sound System

This section introduces the design of local sound systems, such as auditoriums, where microphones and speakers are co-located.

Input and Mix

Application of MIC

Mono & Stereo MIX

Output Structure

How to Design Output

Number of DSP output channels

SP and Location

Types of SP usage

SP location

Conference System

Conference System

with Other system

Intercom System

Intercom

System Design

<Functions>
    - Conversation
​    - Paging

Problems

Problem of sound

​Insufficient Volume & Clipping

High Frequency Less & Reververation
​
Feedback

​Overlap

​We provide Revit family data for BIM.
Please feel free to use it
​for your project design or architectural education.

​Product brochures and instruction manuals are available here.

​Please contact the TOA responsible for your region.