FuzzMeasure Pro (V4) is an easy-to-use acoustic measurement program for Apple Mac computers. FuzzMeasure Pro automatically downloads the calibration file for your UMIK-1 based on its serial number. In this app note we will show you how to get started with the UMIK-1 and FuzzMeasure Pro.
Note: This app note describes the use of Version 4 of FuzzMeasure Pro, which requires Yosemite (OSX 10.10) or later. For Version 3 of FuzzMeasure Pro, please see this app note.
1. Get connected [Top]
Mount the UMIK-1 into the small stand supplied with it, or if you like, you can use any other microphone stand. Connect the UMIK-1 to your Mac using the supplied USB cable.
You will also need to connect your Mac to generate audio output through your system. There are several options:
- The inbuilt analog line output with a 3.5 mm to RCA adapter cable
- Your Mac's optical digital audio output connected to a DAC or A/V receiver
- A USB cable to an external DAC
- An HDMI connection to an A/V receiver
This photograph shows the UMIK-1 connected to a MacBook Pro and a Mini DisplayPort to HDMI adapter cable for audio output:
2. Configure system and software [Top]
Start up FuzzMeasure Pro. You will given a choice of several templates to choose from, which display different combinations of measurement graphs. For acoustic measurement, "Classic" works well, although you can change or customize this later.
The toolbar across the top has several handy buttons that we will use below:
Now load the calibration file for your UMIK-1. From the Window menu, select Microphone Calibration. Click on "+ Add Calibration Record" at the bottom left and select "Import UMIK-1 calibration...".
Enter your UMIK-1 serial number:
FuzzMeasure Pro will fetch your UMIK-1 calibration file and display it:
Note: In its initial release, FuzzMeasure Pro 4 doesn't support absolute SPL calibration based on the sensitivity figure in the UMIK-1 calibration file. Acoustic measurements will be correct but the absolute SPL readings in FuzzMeasure's Sound Pressure Level frequency response display will not be correct. SPL calibration from the UMIK-1 calibration file is expected in a future revision of FuzzMeasure Pro 4.
Click on the Audio Settings button and:
- Select your Playback (output) device ("HDMI" in this example).
- Select the UMIK-1 as the Record (input) device. The sample rate will automatically change to UMIK-1 sample rate of 48000 (48 kHz) if it was not already.
- Under Playback Channels, select the output channel that you want to send the measurement signal on. In this example, it is set for HDMI channel 3. If you have selected a stereo output device, select channel 1 for left and channel 2 for right.
- Under Record Channels, drop down the selector for channel 1 and select "miniDSP UMIK-1."
Note that both input and output operate at the same sample rate, so the output device must be able to operate at 48 khz (almost every device will).
3. Test and measure [Top]
Before proceeding, turn down the volume on your preamp or A/V receiver to a fairly low level. Position the UMIK-1 where you want to take the measurement, and point it towards the speaker being measured.
Click on the + button to view the Measure screen:
As long as you have turned the volume down, you can click on the Measure button (the red one with the triangle). You should hear a faint sweep from low to high frequencies through the selected speaker. Turn up the system volume until the sweep is loud enough to halt a conversation, but not so loud as to be uncomfortable or to sound distorted.
You can now run as many more measurements as you like! If the environment is noisy, set the "Synchronous averages" to a number greater than one in order to average the signal from several sweeps and improve signal to noise ratio. When you are ready, you can save your measurement as a single project file which you can re-open again later.
Now that you have the ability to run acoustic measurements with FuzzMeasure Pro, you can proceed to optimize and equalize your system. The following app notes contain information that you may find helpful in your journey:
- Loudspeaker measurement with UMIK-1 and REW explains the principles of loudspeaker measurement (but you would use FuzzMeasure instead of Room EQ Wizard.)
- Building a 2way crossover and Stereo 3/4 way Crossover describe the basics of setting up a loudspeaker with an active crossover.