• 🔊 Speaker & Subwoofer Phase Alignment Calculator

    Calculate speaker-to-subwoofer delay, sample delay, wavelength, and phase difference at your crossover frequency to help improve timing, bass coherence, and crossover integration.

    Recommended Delay
    1.78 ms
    Delay the closer source to match the farther source
    Distance Difference 2.00 ft
    Sample Delay 85.4 samples
    Crossover Wavelength 14.08 ft
    Phase Difference 45.5°
    Speaker/Subwoofer Alignment Guide

    1. Use the listening position as the measurement point whenever possible.

    2. Measure the acoustic distance from the listening position to the main speaker and subwoofer.

    3. If the subwoofer is farther away, the main speaker may need delay so their signals arrive at the listening position more closely together.

    4. Check polarity and phase behavior around the crossover frequency. Distance-based delay is only a starting point.

    5. Use measurements and listening tests to fine-tune the final setting.
    💡 Tip: For the most useful measurement, measure the distance from each acoustic source to the actual listening position rather than simply measuring the distance between the speaker and subwoofer.
    This calculator estimates time alignment from acoustic distance. Real-world speaker and subwoofer alignment can also be affected by crossover slopes, acoustic phase response, speaker DSP, polarity, room reflections, placement, and the listening position. The calculated delay should therefore be treated as a starting point, not a guaranteed perfect setting.

  • A Speaker & Subwoofer Phase Alignment Calculator can help home-studio owners, producers, live sound engineers, home theater enthusiasts, and audio professionals estimate the timing relationship between a main speaker and subwoofer. Proper time alignment can help improve stereo imaging, bass coherence, and crossover integration.

    The calculator uses the distance from the listening position to the main speaker and subwoofer to estimate the acoustic delay caused by the difference in distance. It then converts that difference into milliseconds and samples, while also calculating the approximate phase difference at the selected crossover frequency.

    For example, if your subwoofer is farther away from your listening position than your main speakers, the sound from the subwoofer takes longer to arrive. A DSP or other delay control can potentially be used to compensate for this difference by delaying the closer source.

    The crossover frequency matters because phase is frequency-dependent. A particular distance difference can produce a relatively small phase shift at a low frequency but a much larger phase shift at a higher frequency. This is why speaker and subwoofer alignment should be considered together with the crossover frequency and crossover slopes.

    Tip: Measure from the acoustic center of each source to your normal listening position whenever possible. Use the calculator's delay as a starting point, then verify the alignment using measurement software, test signals, and listening. Room reflections, speaker placement, crossover design, polarity, DSP processing, and the actual acoustic response of your speakers can all affect the final result.

    Important: Distance-based alignment does not automatically guarantee perfect phase alignment. For the most accurate setup, combine the calculator with actual acoustic measurements at the listening position.