On 12/12/2023 6:50 PM, Steve Wahl via Jukebox-list wrote:
On Tue, Dec 12, 2023 at 06:55:39AM -0500, Tony Miklos via Jukebox-list wrote:
No, the square wave input is a perfect square wave.
I think we're actually agreeing here.
I never took signals theory, but I've read about it and have played with square waves and filters, and adding sine waves together on synthesizers. Acording to theory, a square wave contains the fundamental plus all the odd harmonics. See for instance this wiki page:
https://en.wikipedia.org/wiki/Square_wave#Fourier_analysis
So, with a square wave, you would be exercising the amp's ability to operate over a wide range of frequencies simultaneously, at the fundamental frequency and all of the overtones present in the square wave. Any oddities (e.g. deficiencies in frequency response) will distort the resulting waveform, as you have said.
Oh OK, that makes sense after giving it a little thought.
I don't have diagnosed tinnitis, though maybe a light case of ringing that I can ignore when I'm not thinking about it. I have friends who do have it bad, and I don't envy any of you! Putting Lpads on your test speakers is a very smart thing to do, IMHO.
--> Steve
Although I have tinnitus all the time, it is usually very mild in the morning and I seldom notice it. Later in the day it gets very noticeable. Things like chocolate can make it a lot worse, same for aspirin or other NSAIDS. (and of course a 1K square wave)
I've played around a little with the signal generator trying to match it to the tinnitus, it's up somewhere near 1Khz but different than a square wave and far from a sine wave. To me a triangle wave sounds almost the same as a square wave.
I was sort of stunned that it isn't always a high pitch with everyone. From what my wife tells me, hers is a "whooshing" sound. I sort of didn't believe hers is tinnitus but read up on it and found that it indeed isn't always a high pitch.
I don't know why my text keeps going a step larger than normal, I'm not fixing it here just to see if it comes through the list this way.