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In Reply to: Actually, isn't 30 KHz a tad low? posted by arend-jan on January 24, 2007 at 02:51:23:
>Why did you pick 30 KHz?<I tried it before I built it. I used a low distortion audio signal generator feeding an amplifier feeding wideband isolation transformers and listened. I even tried subsonic frequencies, like 20 Hz, and midband frequencies, like 2 KHz. I tried 20 KHz, and I couldn't hear a thing from the speakers just like 20 Hz. I tried 30 KHz and it sounded identical to me. I tried 40 KHz and it sounded identical. I stuck with 30 KHz just to keep all harmonics as low in frequency as possible and be safely out of my hearing.
BTW, 20 Hz ain't so hot. It starts to sound blurred down there. In fact I think it sounds better at 2 KHz than 60 Hz, where it tightens up a bit, but the 2 KHz tone is annoyingly loud that bleeds through.
At 30 KHz I think it sounds better than 60 Hz. Some of these filaments are mechanically jiggling around by the electric field movements at slower freqencies. The 20 Hz seemed to show that, or it's heating and cooling at a rate that's messing with the sound, whichever. At 30 KHz all those problems go away.
Kurt
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