Select either:

• Distance ➜ Delay if you want to calculate delay time based on physical distance and sound speed (this is used for all of the application views below).

• BPM ➜ Distance if you know your music tempo and want to find the matching distance for a given delay time.

• Choose Indoor (uses default 72°F) or Outdoor (enter your actual temperature and pick °F or °C).

• Temperature affects the speed of sound, so for the most accurate results use the outdoor option with a realistic temperature.

When Distance ➜ Delay is selected, pick the application that matches what you’re doing:

1. General: Sound Source ➜ Listener

• What it’s for:
  Basic “how long does it take sound to get there?” calculations—front‑of‑house, delay to a specific listening area, etc.

• How to use it:

  • Enter the distance from the sound source (speaker, array, etc.) to the listening position.

  • Choose the correct unit (feet, meters, or yards).

• Pro Tip: Measure your distance from the same point on the speaker each time (e.g., front grille) to keep things consistent.

2. Main + Delay Speakers

• What it’s for:
  Time‑aligning delay speakers with your main PA so the wavefronts hit the audience in sync.

• How to use it:

  • Enter Main Speaker Distance: distance from the main PA to your reference listening position.

  • Enter Delay Speaker Distance: distance from the delay speakers to the same listening position.

  • Choose the unit (feet/meters/yards) – both distances must be in the same unit.

• What you’ll see:
  The calculator tells you how many milliseconds of delay to add and which speaker system (Main or Delay) should get that delay, based on which is closer/further.

3. Tops + Subs Alignment

• What it’s for:
  Time‑aligning subwoofers with top boxes so low end and mids arrive together.

• How to use it:

  • Enter Tops Distance: distance from the main tops to your reference listening position.

  • Enter Subs Distance: distance from the subwoofers to the same listening position.

  • Choose the unit (feet/meters/yards) – again, both must use the same unit.

• What you’ll see:
  The calculator tells you how many milliseconds of delay to add and whether to delay the tops or the subs to line them up at that position.

In Distance ➜ Delay mode:

• Use General, Main + Delay, or Tops + Subs as described above.

• Make sure all distances for a given view are in the same units and measured from a consistent reference point.

In BPM ➜ Distance mode:

• Enter the tempo (BPM) directly, or tap it in using the Tap Tempo button.

• The calculator uses the environment settings (temperature) to convert that BPM into a physical distance that matches that delay time.

The calculator instantly shows:

• Delay time in milliseconds

  • For General: total travel time from sound source to listener.

  • For Main + Delay and Tops + Subs: the difference in arrival time and how much delay to add to which system.

• Equivalent BPM based on the delay time.

• Musical subdivisions (quarter, eighth, sixteenth, dotted, triplet values) for that timing.

• A side‑view diagram of sound travel with the current effective distance labeled.

For practical use: once you get the delay time, round to what your processor allows (e.g., 10.4 ms → 10.5 ms) and verify by ear or with measurement if you have it.