Intermediate
Speaker Crossover
Build and test a simple first-order crossover path for a tweeter or small speaker driver.
Safety first, always.
ElectroLab AI teaches theory, low-voltage electronics, and planning concepts. Mains voltage, switchboards, fixed wiring, high-current systems, and legal electrical work must only be performed by licensed electricians where required.
Open Safety CenterBuild target
Split audio bands and learn how filters protect and shape speakers.
Build steps
1.Identify the speaker impedance and desired crossover range.
2.Choose a non-polar capacitor rated for audio use.
3.Wire the capacitor in series with the tweeter for a high-pass path.
4.Test at low volume with music or a signal generator.
5.Listen for harshness, weak output, or distortion before increasing level.
What you are learning
1.A series capacitor blocks low frequencies and passes higher frequencies.
2.Crossover frequency depends on capacitance and speaker impedance.
3.Real speaker impedance changes with frequency, so formulas are a starting point.
Bench tests
1.Measure DC resistance of the speaker as a rough health check.
2.Start with low amplifier volume.
3.Compare different capacitor values and note tonal change.
Fault finding
1.No sound: check capacitor connection and speaker continuity.
2.Tweeter sounds strained: crossover frequency may be too low.
3.Sound too quiet: capacitor value may be too small or driver sensitivity mismatched.
Upgrades
1.Add an inductor low-pass path for a woofer.
2.Add an L-pad resistor network for level matching.
3.Measure response with a microphone later.
Project safety
Keep amplifier volume low during testing. Avoid connecting unknown speaker loads to valuable amplifiers.