[TTech]

My daughter and I played around with the speaker yesterday. Decided to experiment a little bit since I am unable to find info on Perfectone speakers. I know tones from an 80's audio generator is not exact testing but we had fun and learned a few things. When tuning this speaker for best operation I used 1000 hz tone. I began with tuning (knob)? tightened all the way in. When I made my mason jar mod. fully CW or tightened has the metal cores of the audio driver coils lightly touching the metal diaphragm. At this position a 1000  hz tone can be heard but very weak. What surprised us was the driver and diaphragm response to the audio driver being slowly tuned CCW, drivers moved away from diaphragm. There would be very little to no change to 1000 hz tone volume out of the speaker. Then suddenly a sharp pop of static then an immediate greatly increased volume of the tone from the speaker. As can be predicted further turning of the audio driver away from the diaphragm quickly produces a much weaker tone. I could never hit the sweet spot of maximum diaphragm output from this point turning the driver CW closer to the diaphragm. The only time I could find the sweet spot was very slowly adjusting the driver away from the diaphragm. It is a very narrow very sharp response point. Simply applying a small amount of tension CW or CCW on the adjustment broke the point of maximum diaphragm resonance.
The original knurled knob driver adjustment unlike my mason jar threads, were a very fine thread. So my thinking is that very sharp response point is normal.

We then played with audio tones, I could begin to hear something at 196 hz. My 22 year old daughter could hear nothing till about 220 hz. One point for the old guy. She blew me away at the higher frequency. I stopped hearing anything at around 2700 hz, She could still hear a tone at just over 9000 hz. Found that somewhat impressive for a piece of resonating metal. But I needed her ears to hear it.

The frequency that provided the most volume was right around 620 hz.

If any of our testing has any form of validity, seems the speaker will respond to the human voice better that music. Our playing around on the kitchen table  in no way qualifies for proper testing. If anyone out there can correct any mistakes in our simple testing and response. Or add to our meager learning curve, please let us know.

P.S. We also played around with a new 8 ohm four inch speaker under the same testing conditions. It's low frequency response was very poor compared to Great Grandpa speaker horn. But. with it I could hear a 9000 hz tone and my daughter could hear a tone at over 17803 hz. Oh to have young ears.