Below the follow up of “Using MicW i436 with Smaart v7 Di – Part-1”
The MicW i436 (designed primarily for iPhone, iPad and iPod Touch) uses a 4-conductor 2.5mm phone connector (CTIA/AHJ standard) that fits into any mobile device, notebook or PC with a headphone/mic socket following that standard. For one-channel measurements like SPL measurements the MicW i436 can be hooked up directly to a headphones/mic socket of a notebook, for example a MacBook Pro.
In case you want to use the MicW i436 with a dual-channel interface measuring program, like Smaart v7 Di, you can’t use the headphones/mic socket on your device anymore. The microphone part of the headphones/mic socket is mono and therefore occupying both left and right audio channels. For example: Smaart v7 Di uses the left audio channel for the “measuring signal” (from the attached mic) and the right channel for “reference signal” (stimulus, pink noise or just music).
They’re three alternatives to hook up the MicW i436 to your (mobile) device if you want to use a dual-channel interface program like Smaart, that is: to a dedicated stereo mic socket (with 1.5V-5V power), external USB sound card (with stereo mic socket) or line-IN stereo socket. See below for further explanation of the alternatives.
- Dedicated stereo mic socket: most of the time these sockets have the necessary 1.5V-5V power to feed the electret element of the MicW i436.
Connecting the MicW i436 is very simple if you use a “stereo mini-jack to L+R mini-jack” adapter like the DAP Audio Xcaliber XGA-16 adapter in combination with the MicW i436 PC/laptop adapter cable. If you need additional cable length you can use the MicW IB011 2m extension cable. In combination with Smaart v7 Di you connect the MicW i436 to the “Left” socket (measuring channel) and connect an audio source (headphones/line-OUT of the same device or external like a live mixer) to the “Right” socket (reference channel).
- External USB sound card: if your device has no stereo dedicated stereo microphone socket you can use an external USB sound card with such a socket.
It took me a while to find an external USB sound card with a stereo socket and 1.5V-5V power (to feed the electret element of the MicW i436). The one that I’ve found was the StarTech USB Stereo Audio Adapter External Sound Card (ICUSBAUDIOMH). You can use the same cables and adapter as described at the first alternative.
Below some pictures of my StarTech/MicW setup to measure headphones. The purpose of the “canned” cable is to damp (pad) the “reference signal” by 20dB so it can be used at the mic socket (right channel) and match the “measuring signal” (left channel) more.
- Line-IN stereo socket: connecting the MicW i436 directly to a line-IN socket won’t work, you must first bring the microphone signal on line-level.
In order to do that you can connect the MicW i436 in combination with the MicW PI49 (2.5V to 48V phantom power) to an iRig PRE (battery operated pre amp with phantom power).
Of all three alternatives this is the best solution, also the most costly one. On the other hand, you have a one-solution-fits-all, the MicW i436 is now usable on any mobile device (MicW i436 directly on headphones/mic socket of the device), any PC or notebook with external sound card with phantom power (MicW i436 + MicW PI49 + normal XLR microphone cable) and any PC or notebook with a line-IN (MicW i436 + MicW PI49 + normal XLR microphone cable + iRig Pre + MicW CB013 + DAP Audio Xcaliber XGA-16).Additional information:
|Brand / Model:||Price:|
|MicW i436, measuring microphone||€ 88,00|
|MicW PI49, 2.5V to 48V phantom power||€ 104,00|
|MicW CB011, 2m extension cable||€ 12,00|
|MicW CB013, PC/laptop adapter cable||€ 12,00|
|StarTech ICUSBAUDIOMH, USB Audio Adapter||€ 29,00|
|IK MUltimedia iRig PRE, XLR microphone interface||€ 24,00|
Go to Part-3 with the actual measurements.