Frequency Test .org Tone generator

Frequency Sweep

Sweep between custom endpoints with a logarithmic or linear curve. Mark buzzes, rattles, peaks and dips while the exact frequency is visible.

15 / 30 / 60 secondsLogarithmic by defaultIssue markers

Frequency sweep

Ready
Current frequency
20Hz
20 Hz → 20 kHz · logarithmic
Mark what you notice
Use a low level. Markers are your observations, not automatic measurements.

Logarithmic sweeps match how frequency is organized

Octaves are ratios: 20 to 40 Hz is one octave, just as 10 kHz to 20 kHz is one octave. A logarithmic sweep spends comparable time across these ratios. A linear sweep moves by the same number of hertz per second and rushes through the bass region.

What a sweep can reveal

You may notice resonances, rattles, abrupt level changes or gaps. None automatically identifies the cause. Repeat the marked area using the tone generator, then change one variable—headphones, source device, listening position or room—to narrow it down.

Hold an exact frequency

Investigate one marked point.

Headphone workflow

Add channels and driver balance.

Speaker workflow

Use room-specific observations.

Before you begin

  1. Lower your device volume before playing a tone.
  2. Start with a quiet, comfortable level.
  3. Never raise the volume to force yourself to hear a frequency.
  4. Stop immediately if the sound feels uncomfortable.
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