Please ignore the ambient noise of the HVAC system, as well as the lousy line quality for my crappy dynamic mic.
You can skip around to compare the different settings if you’d like. I included the results in a table below, with each numbered setting corresponding to a period of time on the non-normalized. I then recorded a systematic test of the phantom power, left and right input levels, and the MIC/LINE-GUITAR select switch in 10-second intervals.
For the “Warm” test, I basically sat on the interface for about 15 minutes until the interface housing was noticeably warmer than room temperature. For the “Cold” test, I left the interface in a box in my car for 30 minutes, where the outside temperature is around 25° Fahrenheit. I also plugged a crappy old dynamic mic into the LINE IN R/GUITAR IN jack TRS 1/4″ jack. For the test I had the following setup: I plugged an Audio-Technica AT 2020 condenser mic into the MIC IN L XLR balanced jack. I conducted a test to demonstrate the whine, which I have included here. I thought about using an electric blanket, but I was afraid that might cause some induction damage. I didn’t read that helpful work-around in the manual. So in order to warm up the interface-no joke-I actually put it under my thigh for a good 10-15 minutes. My home “studio” is in a very cold room with two exterior walls, and it’s the middle of winter. The solution: Sit on the interface to warm it up. But turning on the phantom power while the interface is cold produces a lot of noise. It gets worse when the MIC/LINE-GUITAR select switch is set to “Guitar.” Setting the MIC/LINE-GUITAR select switch to “Guitar” makes it act as an unbalanced input jack, which probably explains the noise. The whine appears with the phantom power on, while the interface is cold (ie, less than about 65 degrees Fahrenheit).
#RECORDING WITH TASCAM 424 MKII TRIAL#
After a lot of trial and error, I have narrowed the problem down to two three variables: Temperature, Phantom Power and the MIC/LINE-GUITAR select switch. None of these things had any consistent effect on the whine. To track down the source, I started by changing out the AC power for battery power, switching USB cords, switching mic cords, switching microphones, switching interfaces, turning on and off the wireless network, unplugging my wireless router, changing rooms, and even moving to a location several miles away. Sometimes the wine was little more than a vinyl-record-like scratch, other times it was a scream, and still others it disappeared altogether. As I recorded I noticed an inconsistent whine in the audio. The gear included two TASCAM US-144 mkII interfaces, two Audio-Technica AT 2020 condenser microphones, two mic cables, two stands, two pop filters, two sets of headphones, etc. ?We do not mark merchandise values below value or mark items as ?gifts? - US and International government regulations prohibit such behavior.The TASCAM US-144 mkII's Phantom Power gets very noisy when the temperature drops below 65I recently purchased two sets of podcasting gear to record podcasts with someone in another state.
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