TESTGEAR
NOW AVAILABLE
Audiofrog
USB-Duo
Compact High-Performance
Dual-Channel USB Soundcard
The USB-Duo has been designed to provide high quality stereo recording when using prepolarized condenser (electret) microphones. A bias voltage of 2.7 VDC is provided on the microphone inputs. Typical input and output frequency response is 20Hz – 20kHz (+0, -0.5 dB). USB-Duo can be used with Macs and PCs, tablets and phones. USB-Duo uses the standard USB audio driver and no additional app is required to use the device. A USB-C to USB-A adapter is included.
USB-Duo can be used with a loopback connection for dual channel FFT analysis, including impulse and phase, with Room EQ Wizard, SMAART, Open Sound Meter and a host of additional acoustic analysis programs. For this, be sure to add an Audiofrog UMI-1 and the loopback connector when you make your purchase.
Works great as a portable mic preamp for the Audiofrog BHM-1 binaural head microphone. Make field recordings with your phone!
SPECS
UMI-1 USB Measurement Interface
You’ve spent hours—maybe even days or weeks—planning and installing your system. Don’t leave the final performance to chance. Tuning by ear is often a frustrating process of turning dials and moving sliders in your DSP only to decide that what you’ve just done stinks.
Stop guessing!
Audiofrog’s new USB Measurement Interface is a complete microphone kit designed to work with most PCs, Macs and tablets that include a USB port.
The UMI-1 is suitable for use with most acoustic measurement and analysis software including Room EQ Wizard (REW), True RTA, Holm Impulse, ARTA and others.
real time
frequency response
measurement and analysis
The adjustable microphone stand is designed to mount easily to the car’s headrest using a Velcro® strap and places the microphone in the ideal location for real time frequency response measurement and analysis.
The TM-1 omnidirectional microphone provides response from 20 Hz to 20 kHz.
A separate calibration file for each serialized microphone is available from Audiofrog.
Audiofrog UMI-1 Kit includes:
- 6 mm Omnidirectional Measurement Microphone with Calibration File
- USB Sound Card with Mic Input and Stereo Line Output
- Microphone Stand with Integrated Extension Cable
- 3.5mm Stereo to RCA Adapter
- 3.5mm Male to Male Adapter
- Velcro Headrest Strap
- Extension Cable
- Carrying Case
- Test CD
DOWNLOADS
Download detailed and straightforward instructions for setting up Room EQ Wizard and True RTA for use with the UMI-1. You’ll also find target curves for each analyzer that will help you with the equalization process that are important for making your system perform its best. Finally, the Liner Notes for the Tuning CD will help you use the test tracks that have been carefully designed and chosen to help you hear what your system should do when it’s tuned correctly.
How to:
To view any of the files:
- Right click on the link
- Choose “Open link in new tab”
To download any of the files:
- Right click on the link
- Choose “Save link as”
- You will be prompted to save the link to a location on your computer
- Choose the location and click “save”.
FAQ
Most frequent questions and answers
First, is the microphone plugged into the stand? The microphone is the little 3.5mm jack-looking thing in the plastic bag in one of the loops. When it’s plugged in, it will look like this:
With PC based analysis software, the RTA window can offer a VERY wide view that might not be available on a single purpose tool. What you see in the graph is residual noise, either in the computer’s electronics or ambient noise in the room, modified by any of the calibration files that you have currently loaded. One might be the microphone calibration file and one might be the soundcard calibration file.
This is no big deal because when you turn on the system you’re going to measure, it will be MUCH louder than that noise—it won’t affect the measurement so long as the pink noise coming from the syst
The cables may not be plugged all the way in. If this is the first time you’re plugging them in, you may need to push extra hard.
There’s been a revision in the Windows sound settings. Instead of clicking on the little speaker in the lower right of your system tray, type “Control Panel” in the search box in the bottom left of your system tray. When the option for the control panel appears, click on it and then choose “Sound” as in the picture below. Then, the settings will look like the ones in the setup guide.
Clear the SOUNDCARD calibration file in the Soundcard Preferences window. If you’re using the pink noise on the CD or on your phone via BT, you don’t need that calibration.
Bluetooth is a lossy compression algorithm. If your phone and your head unit don’t include AptX, then they probably default to SBC, which is the basic Bluetooth codec. Sounds above about 12kHz are removed by that algorithm.
If you’ve ripped the CD into your iTunes or some other media player as an MP3, then high frequencies are also eliminated by that codec. No need to worry, just don’t pay any attention to those frequencies.
Download the document “A Straightforward One-Seat Tuning Process and Some Notes About Why it Works” on the Testgear section of the Audiofrog website and begin on page 38. There are step by step instructions for importing, viewing and scaling the target curve to the measurement.
Please uninstall your version (which is probably a beta version and download version 5.19.
Sorry. No one here has a Mac. We don’t know how to use a Mac, but we understand that the Mac audio setup is pretty similar.
Unfortunately, no. Our license for the music on the CD only allows us to distribute it as part of the kit.
Unplug the charger/power supply for your computer. Depending on the model of the computer, the noise filtering in the supply may be causing the peak.
You should be outside the car. It’s much easier that way. That’s why we provide the extension cable for the microphone.
