SPL Meter is a professional-grade sound level meter, also known as a decibel or dB meter, for your iPhone or iPod touch.
Modeled after a traditional analog SPL meter, we have faithfully reproduced all the characteristics and qualities found in those meters, including the ballistics, ranges, filters, and decay rates.
But don't compare us to a Radio Shack meter, ours is much more accurate!
We have also included a small digital LCD display, as shown in the picture, to make this the best SPL meter on the store. And this is something that the old analog meters never had!
SPL Meter is built by the same team that created the other great professional audio and acoustics apps on the store, Studio Six Digital. Built on the engine of our more expensive "SPL" app, SPL Meter's filters and decay rates meet or exceed ANSI type 1.
SPL Meter is the one audio app that everyone who works in audio must have on their phone! Not only have we made the best one, but we've priced it so anyone can afford to have it.
FEATURES
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. Don't worry if you peg the meter, you won't bend the needle. CALIBRATION
SPL Meter comes pre-calibrated for the typical iPhone 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 you reference meter to the same settings as SPL Meter (choose A 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 (flip the screen over)
* 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.
That's it, you're now fully calibrated. But remember, we do NOT recommend the use of a Radio Shack SPL meter for reference, they are just not accurate enough. INTERNAL / EXTERNAL MIC
Select Internal to activate the included compensation filter, which is designed to flatten the frequency response of the built-in or headset mic.
Select External to use our iAudioInterface.
The compensation filter corrects the roll-off of the iPhone and iPod Touch internal or headset mic.
Compatibility SPL works best on iPhone 3G, but can also work on second generation iPod Touch if an external mic is used. NOTE: If you have a first gen iPod Touch, you will have to use a dock-connector microphone. We have enabled sales to this device, but SPL Meter will not work without an external dock connector mic on a first-generation iPod Touch.
See our iPhone Hardware page for information about using external microphones and other input devices with your phone or iPod. Check out our full line of professional-grade audio and acoustics apps: SPL, the professional digital iPhone sound level meter, LEQ Graph, for recording SPL over time, RTA, a 1/3 octave real-time analyzer, FFT, for detailed acoustic analysis, ETC, the energy-time curve function, RT60, for automated octave-band decay time measurement, Speaker Pop, to test speaker polarity, and Generator, the iPhone signal generator. Also, if you are looking for a great range of high-quality, professional, audio test equipment, check out www.sencore.com. They sell the current versions of the Audio Toolbox, as the SoundPro line of audio test equipment.