FOH · MONITORS · CHURCH AV
Delay, SPL and dB math in one link you can send the crew
Five live-sound calculators on one phone page. $0, no app, no account.
- Price
- $0
- Install
- None, any browser
- Account
- None
Next to a $19.99 app toolkit? See the checkable comparison.
Calculators
52.4ms
Delay to set on the fill
- In samples at 48 kHz
- 2,516
- Speed of sound used
- 343.4 m/s
- Distance
- 18 m · 59.1 ft
75.9dB SPL
Level at the seat
- Drop from the reference
- 24.1 dB
- Rule of thumb
- 6 dB per doubling of distance
Free-field estimate of a single source. Rooms, arrays and horn coverage change it. It is level arithmetic, not a hearing-safety or exposure figure.
0.343m
Wavelength
- In feet and inches
- 1.13 ft · 13.5 in
- Period
- 1.00 ms
- Speed of sound used
- 343.4 m/s
93.5dB
Combined level
- Two equal sources
- add 3 dB
- Method
- incoherent power sum
56.6V rms
Voltage on the line
- Current
- 7.07 A rms
- Formulas
- V = √(W×Ω), I = √(W÷Ω)
Arithmetic only. It does not size cable or judge an installation: check the amplifier and cable specs.
Worked out. Your numbers are in this page's address.
Copy the link and send it to the crew: whoever opens it sees the same setup. Bookmark it to get this venue back next gig.
Missing a calculator? Write us at the reply address.
Compared with AudioTools, the app toolkit
Stagemath is a calculator page, nothing more. AudioTools is a larger app that also measures with the microphone. Here is what its own pages say, so you can check.
| Item | AudioTools | Stagemath |
|---|---|---|
| Runs on | App Store app: iPhone and iPad, also listed for Macs with Apple silicon | Any phone or laptop browser |
| Price to start | $19.99 for the app | $0 |
| Calculators | Marked “free” inside the app | Five, on one page |
| Send a setup to the crew | Not compared | One link; the inputs ride in the address |
| Microphone measurement | Yes. Its pricing page lists modules from $.99 to $199.99 and two bundles, $349.99 and $399.99, and marks some tools “free” | None. Stagemath does not measure. |
If you need a mic, an RTA or an impulse response, AudioTools does that and Stagemath does not. Stagemath is independent and not affiliated with AudioTools or Studio Six Digital.
How it works
- Where the numbers go
- Each calculation is a request to our server, answered with fixed formulas. We keep a count of requests, and the numbers travel in them. Nothing is saved to an account, because there is none.
- Automation
- Results come from plain formulas, not an AI model. An AI agent designed and built this page. A person reads the mail you send us.
- The assumptions
- Speed of sound is 331.3 + 0.606 × °C m/s, dry air. SPL drop is free-field, 20·log10 of the distance ratio. dB addition sums power, not voltage. Check on site; trust your measurement over a formula.
- Who made it
- Made by Fernlot, a small studio that builds single-purpose web tools.