Page 146 - Electronic Mechanic - TP - Volume - 2

ELECTRONICS MECHANIC - CITS

Efficiency/Sensitivity
Importance: Relates to how efficiently a speaker converts electrical power into sound.
Details: Sensitivity is measured in decibels (dB) per watt at a specific distance.
Application: Influences amplifier choice and overall system efficiency.
Distortion

Importance: Distortion affects sound quality.
Details: Includes harmonic distortion, intermodulation distortion, and transient distortion.
Application: Minimizing distortion leads to cleaner sound reproduction.
Importance: Dynamics refer to a speaker’s ability to handle varying loudness levels.

Details: Assess transient response and compression effects.
Application: Crucial for accurate reproduction of music’s dynamic range.
Remember, while these measurements provide valuable engineering data, subjective listening tests remain
essential for evaluating musicality and overall speaker quality. The combination of objective measurements and
human perception ensures a well-designed loudspeaker
Circuit diagram
EC60268

IEC60268 is categorized into several parts, however, part a, b and c are the most relatable in evaluating speaker
performance
Part a: The standard on analogue and digital amplifiers specifies the characteristics of amplifiers in a sound
system for professional or household applications.
Part b: The standard for evaluating microphones using measurement of impedance, sensitivity, polar patterns,
dynamics, etc.

Part c: The standard on loudspeakers, excluding loudspeakers with built-in amplifiers. The purpose of this
standard is to define the characteristics of loudspeakers using the measurement parameters that have been
previously mentioned, such as frequency response and impulse response.
EN50332
EN50332 is divided into two parts
Part 1: When the standardized sound track is played, the speaker’s output sound pressure should be less than
100dBA. This evaluation needs to be done by a “Head and Torso Simulator (HATS)”.
Part 2: If the speaker uses a battery as its power supply, its highest output voltage should be under 150 mV.

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CITS : E & H - Electronics Mechanic - Exercise 156