What is the difference between pink and white noise?

Pink noise has equal energy per octave, decreasing by 3 dB per octave on a linear frequency scale. White noise has equal energy per hertz, which means more total energy in higher octaves. Pink noise sounds balanced while white noise sounds bright and hissy. Pink noise is standard for audio calibration.

How loud should pink noise be for calibration?

Set the level to produce 75 to 85 dB SPL at the listening position. This provides adequate signal-to-noise ratio for accurate measurement while remaining comfortable for extended calibration sessions. Higher levels stress speakers and ears unnecessarily.

Can I calibrate speakers with music instead of pink noise?

Music is useful for subjective evaluation but poor for calibration because its spectrum varies moment to moment. Pink noise provides consistent energy across all frequencies, enabling stable level matching and frequency response measurement. Use music for final verification only.

Why does pink noise sound flat but white noise sounds bright?

The ear processes sound in critical bands (approximately octave-wide). Pink noise has equal energy per critical band, sounding balanced. White noise has 3 dB more energy in each successive octave, so the higher octaves dominate perceived brightness. The 10 kHz to 20 kHz octave contains as much energy as all frequencies below 500 Hz combined.

How long should I play pink noise for measurement?

For transfer function measurement, 10 to 15 seconds of averaging produces stable results. For RTA-based level matching, pink noise should run continuously while you read the meter. For SPL calibration, allow 10 seconds for the Leq reading to stabilize at the listening position.

What is the difference between pink and white noise?

Pink noise has equal energy per octave, decreasing by 3 dB per octave on a linear frequency scale. White noise has equal energy per hertz, which means more total energy in higher octaves. Pink noise sounds balanced while white noise sounds bright and hissy. Pink noise is standard for audio calibration.

How loud should pink noise be for calibration?

Set the level to produce 75 to 85 dB SPL at the listening position. This provides adequate signal-to-noise ratio for accurate measurement while remaining comfortable for extended calibration sessions. Higher levels stress speakers and ears unnecessarily.

Can I calibrate speakers with music instead of pink noise?

Music is useful for subjective evaluation but poor for calibration because its spectrum varies moment to moment. Pink noise provides consistent energy across all frequencies, enabling stable level matching and frequency response measurement. Use music for final verification only.

Why does pink noise sound flat but white noise sounds bright?

The ear processes sound in critical bands (approximately octave-wide). Pink noise has equal energy per critical band, sounding balanced. White noise has 3 dB more energy in each successive octave, so the higher octaves dominate perceived brightness. The 10 kHz to 20 kHz octave contains as much energy as all frequencies below 500 Hz combined.

How long should I play pink noise for measurement?

For transfer function measurement, 10 to 15 seconds of averaging produces stable results. For RTA-based level matching, pink noise should run continuously while you read the meter. For SPL calibration, allow 10 seconds for the Leq reading to stabilize at the listening position.

How to Use Pink Noise for Calibration

6 steps15-20 min readUpdated 2026-03-20

Quick Answer

Using pink noise for calibration means feeding a broadband signal with equal energy per octave through the sound system and measuring the output to verify frequency response, match levels between speakers, and establish a reference operating level. Pink noise is the standard calibration signal because its spectral shape matches how the ear perceives frequency balance.

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Equipment Needed

✓SonaVyx with built-in pink noise generator
✓SPL meter for level calibration
✓Measurement microphone for frequency response verification
✓Audio cable to connect generator output to system input

Step-by-Step Guide

Generate Pink Noise Signal

Use SonaVyx's built-in signal generator to produce pink noise. Pink noise has a spectral density that decreases by 3 dB per octave, giving it equal energy per octave band from 20 Hz to 20 kHz. This matches the bandwidth of standard octave and 1/3 octave analysis, making it ideal for system calibration. Set the output level so the system produces 75 to 85 dB SPL at the listening position, a comfortable level that provides good signal-to-noise ratio without fatigue.

Route to System Under Test

Feed the pink noise into the system at the input stage, typically the mixing console line input or the system processor input. This tests the entire signal chain from input through processing, amplification, and speakers. For individual speaker calibration, route to each speaker zone independently. Ensure all EQ and processing is in the signal path as it will be during normal operation, unless you are specifically testing the raw system response before any processing.

Measure with RTA or Transfer Function

Open SonaVyx's RTA mode for single-channel analysis or Transfer Function mode for dual-channel measurement. RTA shows the combined spectrum of source plus system plus room, which is useful for level matching between speakers. Transfer function removes the source spectrum, showing only the system response. For calibration, transfer function is preferred because it reveals the true system response regardless of the pink noise generator's spectral accuracy.

Match Levels Between Speakers

Play pink noise through each speaker zone independently and measure the SPL at the primary listening position. Adjust amplifier gains or processor output levels until each zone produces equal SPL. For stereo left and right, match within 0.5 dB. For fills and delays, match to the main system level at the coverage boundary. SonaVyx's SPL meter provides a stable Leq reading for level matching that is less affected by fluctuations than peak or instantaneous readings.

Verify Frequency Balance

With all speakers playing together, verify that the overall frequency response matches your target curve within plus or minus 3 dB from 80 Hz to 12 kHz. SonaVyx overlays your chosen target curve (Flat, House Curve, X-Curve) on the measurement for visual comparison. If the response deviates significantly, apply corrective EQ. Use 1/3 octave smoothing for this evaluation as it corresponds to the ear's frequency resolution and is the standard for system calibration.

Establish Reference Level

Set the system operating level so that 0 VU or nominal level on the mixing console produces the desired SPL at the listening position. For cinema, this is 85 dBC per the SMPTE/ISO 2969 standard. For live music, the reference varies by application but typically ranges from 90 to 100 dBA. Document this reference level as the system calibration point. All subsequent gain adjustments during operation are relative to this reference.

Pink Noise vs White Noise

Pink noise and white noise are both broadband signals but differ in spectral distribution. White noise has equal energy per frequency (Hz), which means its spectral density is flat on a linear frequency scale. Pink noise has equal energy per octave, which means its spectral density decreases by 3 dB per octave (or 10 dB per decade). On a standard RTA display with logarithmic frequency axis and octave or 1/3 octave bands, pink noise appears flat while white noise slopes upward at 3 dB per octave.

Why Pink Noise for Calibration?

Pink noise is preferred for calibration because the human auditory system processes sound in critical bands that approximate octave or 1/3 octave bandwidth. Equal energy per octave means each critical band receives equal energy, producing a perceptually balanced sound. White noise sounds bright and hissy because the high-frequency octaves contain far more energy than the low-frequency octaves. Playing white noise through a perfectly flat system would sound treble-heavy.

Digital Pink Noise Quality

SonaVyx generates pink noise digitally using a filtered white noise algorithm with proper 1/f spectral shaping. Digital generation provides consistent, repeatable spectral content that does not drift over time. The generator output is flat to within plus or minus 0.5 dB per 1/3 octave band. For transfer function measurement, the exact spectral shape of the pink noise does not matter because the dual-channel measurement cancels it out, but for RTA-based calibration, generator accuracy matters.

Common Mistakes to Avoid

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Using white noise instead of pink noise for RTA-based calibration, which makes the system appear bass-deficient

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Setting the calibration level too low, resulting in poor signal-to-noise ratio that hides low-frequency response

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Expecting pink noise to sound "flat" on an RTA when the system has processing in the signal path

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Playing pink noise through the wrong routing path, not testing the actual signal chain used in performance

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Using a single short burst of pink noise instead of continuous playback for stable averaged measurements

Applicable Standards

Standard	Clause	Relevance
IEC 60268-1	Clause 16	Defines pink noise spectral characteristics for loudspeaker testing
ISO 2969	—	Reference SPL calibration for cinema sound systems using pink noise
AES-2id:2023	Clause 4	Source signal requirements for acoustic measurement

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