Worship SPL: Church Volume is an iPhone app for church sound teams. It logs worship service sound levels, shares a one-page PDF report with your pastor and team, and shows how much stage sound reaches the seats before the mains are added.
How to use
Stage Volume Check
Use it during rehearsal. Put the iPhone on a stand at the center of the seating area, at ear height. Have the band repeat the same loud section while you mute and unmute only the mains at the times shown. The app shows, by frequency band, how much the mains add on top of the sound from the stage.
Service Monitor
Use it during the service. It shows the 15-minute average level and how far it is from the limit you set. You can log each service and share a one-page PDF report.
Position Correction
If your mixer is not in the middle of the main seating area, measure a correction once with pink noise. The app then estimates the level at the center of the seating area from measurements at the mixer.
Pink noise file
For Position Correction, play this file through the mains from the computer at the mixer: pinknoise.wav (3 minutes, 48 kHz). You can also share it from the app.
Calibration
Without calibration, levels are relative to this iPhone's microphone. To see levels in dB(A) and the difference from your limit, calibrate once with a sound level meter (Setup on the home screen).
Common questions
I turned off microphone access by mistake
Open the iPhone's Settings, tap Worship SPL, then turn on Microphone.
I subscribed, but the features are locked
Tap Restore Purchases on the subscription screen. With the same Apple Account, it works after a new iPhone or a reinstall.
How do I cancel the subscription?
Open Settings, tap your name, then tap Subscriptions.
Is any audio recorded?
No. Sound is analyzed on your iPhone and is not saved or sent anywhere.
What’s new
Version 1.5
Your service log is saved every minute. If the app closes during a service, you can save or discard that log the next time you open it.
The 15-minute average keeps going after the microphone briefly stops. The time with no measurement is shown in the PDF report.
New Dim button while logging, for dark sanctuaries.
“Right now” on Home now uses the same seating position correction as Service Monitor.
Version 1.4
A clearer App Store page: new screenshots and description. The app works the same as version 1.3.
Version 1.3
If the microphone stops during a service (a call, Siri, or the screen locking), the app keeps trying until measuring starts again.
Position Correction: measuring again keeps your current correction until the new one is saved, and only the step that failed needs to be measured again.
Stage Volume Check: on a different iPhone, you can start a new baseline.
A calibration made on another iPhone is no longer used. The app shows “Different iPhone” until you calibrate this iPhone.
Changing the calibration restarts the 15-minute average.
The calibration steps now say to set the meter to Slow response.
Report file names use your local date and time.
Fixes for joining a team and for syncing.
Version 1.2
Service logging keeps running when you go back to the home screen.
If a call or Siri takes the microphone, measuring starts again when it is free. The screen stays on while logging.
The 15-minute average on the home screen now includes position correction, the same as Service Monitor and the report.
The highest 15-minute average is saved even when your church has no limit.
You are asked before joining a team, and a copy of this iPhone’s records is kept.
See all past services, not only the latest five.
You are asked before a log stops. Logs shorter than 1 minute are not saved.
The subscription screen shows the plan name.
Fixes for subscription status and team sync.
Version 1.1
You can now use an offer code from the Subscription screen with “Redeem Code”.
The Subscription screen now describes more clearly what is free and what is part of the subscription.