Speaker Test — Sound Test Files and Audio Test Downloads

Two seconds after pressing play you know if a speaker is dead. What takes longer to find: the left channel running 2dB hot, the tweeter dropping off at 14kHz, the room adding 6dB at 80Hz that you’ve been EQing out for months without knowing it. Fifteen years building this library, and those are still the problems these files get used for.

Left right speaker test

The fastest check you can do on any system. Click the left button — sound should come exclusively from the left speaker. Click the right button — same on the right. If you get sound from both sides on either click, your channels are crossed somewhere in the chain. Could be the amplifier, the cables, or the software output settings. The test takes ten seconds and eliminates the most common wiring mistakes before you go any further.

Audio test files

The audio test files section contains FLAC downloads from THX — the same organization behind the certification standard used in professional cinemas. The THX Ultimate Subwoofer Test runs three minutes and forty-two seconds of sustained low-frequency content, which is long enough to identify port noise, panel resonance, and distortion at high excursion. The Always Coca-Cola file is shorter but covers a wider frequency range — useful for checking tonal balance across the full spectrum. All files are lossless FLAC, which means no compression artifacts affecting the test results.

Frequency tone generator downloads

The frequency tone generator downloads cover every step from 20Hz to 20KHz — the theoretical limits of human hearing. In practice, most adults can’t hear above 16KHz and most subwoofers roll off somewhere between 20Hz and 40Hz depending on the cabinet design. Running the tones from the bottom up tells you exactly where your system starts and where it stops. The last page of the section includes sweep files that go from high to low and combination tones — useful for identifying resonant frequencies in the room that amplify certain notes unnaturally.

One thing the 20Hz and 30Hz files reveal quickly: whether the subwoofer is moving air at those frequencies or just shaking the cabinet. A sustained, clean tone at 20Hz sounds like pressure — you feel it as much as hear it. A thud that decays immediately is the port or the panel, not the driver doing its job.

Pink noise vs white noise

Six noise types in the noise section: white, pink, brown, grey, blue and violet. Pink is the go-to for calibration work — perceived loudness stays consistent across the spectrum because the energy drops 3dB per octave, which is roughly how human hearing compensates for frequency. White spreads energy flat per frequency rather than per octave, ends up sounding top-heavy, and that high-frequency bias makes it a poor reference for anything below 1kHz. White noise distributes energy flat per Hz — audibly bright and skewed toward the top end, which is why it rarely gets used for calibration below 1kHz.

Brown: steep low-end bias, 6dB per octave drop going up. A subwoofer under brown noise for ten minutes either holds together or tells you exactly where it doesn’t. Grey flips the loudness curve — the energy underneath isn’t flat but your ears hear it as if it were. Blue adds 3dB per octave going up, violet adds 6dB. Both are high-frequency heavy and less common in speaker testing, though useful for checking tweeter response above 10kHz. All six types are lossless FLAC — no compression touching the high-frequency content where artifacts show up first.


The left/right test audio was created by XSerra and is available under a Creative Commons license at Freesound.