Introduction

Voice Coil is an important part of understanding loudspeakers and audio systems. The subject becomes much clearer when the electrical, mechanical and acoustic aspects are considered together.

How It Works

Loudspeaker behavior results from the interaction of electrical drive, magnetic force, mechanical movement and the surrounding acoustic system. Changes in one part of the system can affect the others.

Important Parameters

• Impedance and electrical loading
• Frequency response
• Power handling
• Sensitivity and efficiency
• Mechanical limits and enclosure effects

Practical Measurement

Speaker systems can be investigated using a multimeter, impedance measurements, signal generator and oscilloscope. For more detailed work, frequency-response and acoustic measurement equipment can be used.

Common Mistakes

Avoid exceeding the speaker's thermal or mechanical limits, connecting an unsuitable amplifier load, or assuming that nominal impedance is constant across the entire audio spectrum.