Loudspeaker Audio Tone Load

Application

Use this circuit as a simple audio load example for amplifier and signal-source experiments.

Design Context

A sine source drives an 8 ohm loudspeaker through a small source resistor so the source voltage, speaker voltage, and speaker current can be compared.

Expected Behavior

The speaker voltage follows the audio tone, and the branch current tracks the 8 ohm load impedance.

Key Values

• VIN uses a 1 kHz sine tone.
• RSRC is 1 ohm so most of the signal appears across the speaker.
• SPK1 is set to 8 ohm nominal impedance.

Suggested Experiments

• Change the source amplitude and watch Ispk scale.
• Increase RSRC to model amplifier output resistance.
• Change the speaker impedance to compare 4 ohm and 8 ohm loads.

Featured Component

The loudspeaker component behaves as a nominal resistive speaker load, making current and voltage relationships easy to inspect.