🔊 Speaker Test Tones

A speaker test tone is a pure audio signal (usually a sine wave) played at a specific frequency. It helps you identify issues with your speakers or headphones—such as distortion, rattling, channel imbalance, or frequency response problems. By isolating left/right channels, you can verify each speaker works independently. Frequency sweeps help reveal resonant frequencies or dead spots in your audio system.

Click the LEFT button to play a tone through only the left speaker. Sound should come exclusively from the left side. Click RIGHT to test the right speaker. If you hear sound from the wrong side, your audio wiring or headphone orientation may be reversed. The BOTH button plays through both channels simultaneously for stereo verification.

A frequency sweep plays a tone that smoothly transitions from a low frequency to a high frequency (or vice versa). This helps you: (1) Check if your speakers reproduce the full audible spectrum (20Hz–20kHz), (2) Identify rattles or buzzes at specific frequencies, (3) Find crossover gaps in multi-driver speaker systems, and (4) Detect hearing sensitivity changes across frequencies.

White noise has equal power per Hz across all frequencies—it sounds bright and hissy. Pink noise has equal power per octave, meaning power decreases by 3dB per octave as frequency increases. Pink noise sounds more balanced to human ears and is often used for speaker calibration and room acoustics testing because our hearing perceives it as having equal energy across the spectrum.

440 Hz is the international standard pitch for the musical note A4 (A above middle C). It sits in the mid-range of human hearing where our ears are most sensitive (around 1–4 kHz). Because it's a universally recognized reference frequency, it's ideal for quick speaker checks, channel verification, and as a baseline for comparing audio equipment.

Common signs of speaker damage detectable with test tones: (1) Buzzing or rattling at specific frequencies (often indicates a torn cone or loose component), (2) No sound from one channel (blown driver or wiring issue), (3) Distortion at moderate volumes (voice coil damage), (4) Very weak bass response (woofer damage), (5) Scratchy sounds during frequency sweeps (debris in the voice coil gap). Test at moderate volume to avoid further damage.

Absolutely! This tool is excellent for headphone testing. Use the Left/Right channel test to verify each earcup works independently and is wired correctly. The frequency sweep helps identify driver matching issues between left and right. For in-ear monitors, you can also detect seal problems—if bass frequencies sound weak, your ear tips may not be creating a proper seal.

The typical human hearing range is 20 Hz to 20,000 Hz (20 kHz). However, this range decreases with age and exposure to loud sounds. Most adults over 30 cannot hear above 15–16 kHz. Children and young adults may hear up to 18–20 kHz. Frequencies below 20 Hz are felt as vibrations (infrasound) rather than heard as distinct tones.

No—exercise caution. Test tones, especially high-frequency ones, can damage hearing or speakers at excessive volumes. Always start at a low volume (25–30%) and gradually increase. High frequencies (above 8 kHz) can be particularly harmful at high SPL because they may not feel "loud" subjectively but can still cause hearing damage. Never play test tones at maximum volume for extended periods.