Building Watt/puppy clone

Gee Tommy, you could be my long lost Great Grandfather...just kidding! I'm a young baby at 31. What you are describing is ultrasonic, usually above human hearing. I figure I can hear about the same as the average audiopile my age, perhaps a tad over 20 kHz. I'm sure that dog whistles produce plenty of fractional harmonics that are below the fundamental, and this is what any human would be hearing if they heard anything at all, with one of these whistles. Somebody should measure one.

ok, SUPERSONIC. im in the medical business and that word is uksed a lot there. we sense freqs above that abut its with hair follicles. julian hirsch, are you LISTENING? good riddance to him and i wouldnt have wished death on leonard feldman, just another magazine for him to write for. now it doesnt matter unfortunately. oh goody, my S&V scrip has been extended. well, arf arf. i hear my masters whistle. notttttt. you know carl, yu should have veen around for the days of early shibata styli (owwwww!) and heil drivers (same band of rough freqs). heaven forbid you hear them together. the 1st threshhold 400As had that about them tool i was much younger then. i still hear up to about 16k so i hear most of the music, glad i didnt fo to vit nam and ber subjected to gunfire. for that ill settle for the opening of EINSTRAUSSFEST on telarc.

Carl, can you realy hear to 20kHz? Have you been tested by a medical professional or audiologist that does hearing exams. I used to have pretty good hearing, enough that the old 19 kHz Admeco ultrasonic motion detectors that were used in the late 60's and early seventites would just about instantly give me a headache when they got turned on. Of course, I was only 18-20 at the time, I always thought my hearing was excellent. So, give yourself a test. Get a good pair of headphones, and an HP 3325 signal generator (or equivalent) and sweep through the range to see where your hearing falls off. Don't use extreme power levels, even if your can't hear it, it could cause warming of the soft ear tissues. This gave me a good wake up call, I'm 48 and little over 16 kHz is about it, sadly enough. Well, thanks for the conversation. /Paul

Paul, yes. I thought I already covered this above. My Maggies and a test CD say I can hear a 20 kHz signwave, referenced to a 1 kHz sinewave at about 79 dB on a radio shack SPL meter, in the listening seat. Of course, the 1 kHz tone sounds pretty loud at 79 dB, and the 20 kHz tone sounds several dB quieter, but I can still hear it easily, along with the accompanying intermodulation waveforms that must accompany such a waveform, in the redbook format. The 20 kHz tone sounds much "dirtier" than even the 19 kHz tone, though. The 18 and below ones sound very clean on my CD50.

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