#TEST TONE GENERATOR VST ABOVE 20K ZIP#
What am I missing?įor anyone who might be interested I've posted the Reaper project (~5MB zip file) with sweep signal file and frequency markers at. Also, let me ask if I'm oversimplifying the process of calibrating the monitor-room system to the point that I'm likely to screw it up instead of making it better. The signal file (track 6., called log sweep), as well as a number of other test signal files can be downloaded from. So if one of you fellows with a high-end audio interface would give a listen to the signal file out I would appreciate it. I would really like to know whether this distortion is in the original wave file, or if it is being generated by my sound card. I also noticed (both by ear and visually in the SPAN display) what appears to be distortion in the sine wave when the sweep passes above about 5kHz(you can see it in the screen shot below). For the time being I have EQed this peak out (until I can fiddle with the acoustic treatment of the room). Listening to the sweep, it was clear even to my ear that the monitor-room system had a significant peak at around 500 to 1000 Hz. I used the Voxengo SPAN signal analysis plug-in to measure the frequency of portions of the file, and used markers to identify when the sweep hit 40, 60, 100, 200Hz and so on up to 20 kHz. The test tone is supposed to be a pure sine wave which takes 32 seconds to steadily move from 20Hz to 20,000 Hz while gently and smoothly dropping in level from 0dB (full-range digital) to -6dB.Īfter I listened to the test tone sweep, I realized that I needed to identify where some landmark frequencies fell on the time line of the sweep.
Both the Left and the Right channels of the. WAV file of the signal and brought it into Reaper. Scrounging around on the web I found the Bink Audio Test CD, kindly provided by Michael Bink Knowles Audio and Video Production, which had contained a suitable test signal. Being the lazy sort that I am, I thought I'd try to keep it simple and use a sine wave tone sweeping up from 20 Hz to 20 kHz and my very un-golden ears to do the job.
I decided that I would try to find a way to check for peaks and valleys in the response of my monitors (given their interaction with room acoustics).
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