Page 145 - Electronic Mechanic - TP - Volume - 2

ELECTRONICS MECHANIC - CITS

EXERCISE 156: Testing of speakers,woofers & tweeters

Objectives

At the end of this exercise you shall be able to
• testing speakers, woofers, and tweeters is to ensure that they are functioning properly and delivering the best
sound quality.

Requirements

Tools/ Materials
• Microphone and Computer
• Software
• Calibrated Microphone
• Laptop (Recommended)
• Avoid Reflections

Procedure

Frequency Response
Importance: No other single measurement correlates more strongly with listener preference than frequency
response.

Observation: It refers to the range of frequencies a speaker can produce, from low bass tones to high treble
notes.
Impulse Response

Importance: Impulse response characterizes a speaker’s transient behavior.
Details: It represents how a speaker responds to sudden changes in input signal.
Application: Used to assess transient accuracy and time-domain performance.
Cumulative Spectral Decay (Waterfall Plot)

Importance: Reveals resonances and decay behavior.
Details: A 3D waterfall plot shows off-axis response at various angles.
Application: Helps determine listening window, early reflections, and power respons.
Polar Response
Importance: Represents a speaker’s off-axis response.
Details: Examined using a 3D plot, which provides insights into directivity and dispersion.

Application: Useful for optimizing speaker placement and minimizing room interactions.
Step Response
Importance: Evaluates a speaker’s transient behavior.
Details: Measures how quickly a speaker responds to a step input.

Application: Helps assess time alignment and phase coherence.
Impedance
Importance: Impedance affects amplifier compatibility.
Details: Impedance curve shows variations across frequency.
Application: Helps design suitable crossover networks.

128
CITS : E & H - Electronics Mechanic - Exercise 156