what happens between a teslacoil the battery the incadescent bulb and the ground

[gotoluc]

Hey Mags,

I also think along the same lines with acoustics as sound engineering (recording) was a hobby of mine in the past.

Lets say we have 10 identical acoustic guitars that are identically tuned and place them in a circle. Pluck one string of one guitar and all the other 9 guitars will vibrate the same.
Do the other 9 guitars dampen the first one so they can all vibrate?... I don't think so! as long as they are all identically tuned which is not an easy feat with wood grain variation of each acoustic chamber. Maybe it could be done with a plastic molded Guitar like the Ovation?

Anyways, I'm still trying to perfect the circuits losses. Hope to have something better to show soon.

BTW, I don't think I would agree that one could fully hear a low frequency of a speaker producing 20Hz let alone 15Hz inside a car. There's just not enough distance from the speakers to the listener for this to happen. Have a look at the chart of frequency wavelength distance needed in a room.

"Quote" and chart from: https://www.acousticfields.com/wavelengths-in-our-rooms/
"If we use 20 Hz. as our frequency, we take the speed of sound 1130 ft./sec. and divide it by 20. Our answer is 56.5 ft. This means that a 20 Hz. wave has a wavelength of 56.5′. How does this 20 Hz. or 56.5′ wave fit into our home theater, listening, or professional recording studio?"

Kind regards

Luc

[TinselKoala]

You don't actually need a real 20 Hz signal in order to _hear_ a 20 Hz tone.

https://en.wikipedia.org/wiki/Missing_fundamental

[Magluvin]

BTW, I don't think I would agree that one could fully hear a low frequency of a speaker producing 20Hz let alone 15Hz inside a car. There's just not enough distance from the speakers to the listener for this to happen. Have a look at the chart of frequency wavelength distance needed in a room.

"Quote" and chart from: https://www.acousticfields.com/wavelengths-in-our-rooms/
"If we use 20 Hz. as our frequency, we take the speed of sound 1130 ft./sec. and divide it by 20. Our answer is 56.5 ft. This means that a 20 Hz. wave has a wavelength of 56.5′. How does this 20 Hz. or 56.5′ wave fit into our home theater, listening, or professional recording studio?"

Kind regards

Luc

Actually there were some systems in older corvettes that you could hear down to 10hz. Of which is highly unnecessary. There is definitely a lot of tracks with content in the 20hz range that most never get to experience unless they are in a movie theater or have a home/ car system that is designed to do so.

In a room, larger than a car or suv, the best placement for a sub is in the corner, and the worst is on the middle of the room. From the corner the wave can only propagate outward from that corner. As you move the sub around the room the waves off of different walls can create nodes in the room where you can get the full effect here, but close to nothing there, and freq will affect where the nodes and nulls are.  Similarly in the car say even an suv, it is best to have the sub all the way in the back, where if it were in the middle of the vehicle, some of the wave travels forward and back thus reducing what you hear up front due to that loss of the wave toward the back. Been doin this for a long time.



Mostly I was exclaiming that is that most ported subs are tuned around 30 to even 49hz. The cutoff below the tuning freq is steep 24db per octave and tuned to 30 the port is way out of phase with the speaker mostly canceling out around 20 and below. Thats why they make adjustable subsonic filters as to  not waste power moving the speaker for nothing. But I like those lows so I like to tune low so there is a gain in that area.  And, below 80 hz, the db level gains gradually up to 12b at 20hz in a car compared to the graphs a box design prog would show.

https://www.youtube.com/watch?v=9cwOyqHi7kU

Mags

[gotoluc]

I agree that a car or home system can be designed to produce 20Hz or lower but if you don't have the distance from the speakers then you're not truly hearing it, you're feeling it along with the air displacement caused by your secondary enclosure (car) as demonstrated in this video: https://www.youtube.com/watch?v=u4LNeh3htyQ

Ever noticed that you hear a better deep subsonic sounds (not feel) when you're further away from one of these mussel sound cars.

Regards

Luc

[woopy]

Hi everyone

are we on track with the sound propagation ?

Is any similarity or analogy with what happen around the Tinselcoil and if yes please explanation.

Laurent