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SPL Meter is a professional-grade sound level meter, also known as a decibel or dB meter, Android device. This is a faithful reproduction of all the characteristics and qualities found in a traditional analog SPL meter including the ballistics, ranges, filters, and decay rates. SPL Meter's filters and decay rates meet or exceed ANSI type 1.
- Filters: ANSI A and C weighting filters are provided. Just flip the switch to select the filter. A weighting rolls off low frequencies fairly steeply, and also rolls off high frequencies. Think of this as a "speech" filter.
C weighting rolls off low and high frequencies slightly, think of this a a "music" filter.
- Decay: Flip the switch to choose ANSI Fast or Slow. Slow will give you a better average reading, while Fast will follow peaks better.
- Ranges: Select 40dB to 120dB in 9 ranges. Whatever range is selected, this is the value at the 0dB mark on the meter.
- Calibration: SPL Meter comes pre-calibrated for the typical Android built-in and headset mic, but you can adjust the cal if you have a professional, calibrated meter to compare it to.
To adjust the calibration of your meter, follow these steps:
- Set your reference meter to the same settings as SPL Meter (choose C and Slow, for example, on both meters)
- Play pink noise or white noise through your system to get a reading on your reference meter in the range of 70-85dB
- Go to the settings page on SPL Meter (touch the “wrench” in the upper right hand corner)
- Select the correct mic setting (normally Internal)
- Adjust the Trim field using the + and - buttons until the dB field matches the reading on your reference meter.