LARSA is a powerful impulse response and analysis measurement tool. It is ideally suited for measuring loudspeakers in rooms, multi-speaker setups, car audio systems, home theatre systems or larger, installed speaker systems. LARSA is an acoustic measurement tool that mathematically compares a reference log sine chirp signal to that same signal measured through a transducer and room. This is useful, in that by subtracting the measured signal from the reference signal, what remains is just the impact of the speakers, other devices in the signal chain and any room interactions.
- With iAudioInterface2, you will plug in the line output of the interface into the input of the speaker you want to test
- Plug in your measurement microphone into the microphone input of the interface and set up the microphone in the location where you wish to measure the response
- With our iTestMic, the configuration will be the same, except you will use the line output of your iOS device to feed the measurement signal into your system
- Finally, you can use the internal microphone to capture the measurement signal, although for best results, a measurement microphone should be used
- First step you need to perform is to take a reference measure to determine the latency of your system
- Tap the wrench icon and in the ETC Graph setup screen you will see a Latency box, set this to 0.0s that start
- Tap done place the microphone as close as you can to the transducer you wish to judge
- Set the gain of your microphone preamp by tapping the gear icon, and then microphone setup
- Complete calibration and gain adjustment instructions, please refer to the instructions in the settings screen
- Tap the measure button to take your first measurement, a log sine chirp signal will be recorded and through a process known as deconvolution, the resulting impulse will be generated
