Hi , well i was thinking how wide do i make a rectangular panel. ? i got one measuring 18.5cm wide playing down to 50 hz. but in rather would be making less wide panels.
Questions are more along the line of adding more panels how much would the resonance lower ? if any with planar magnetics. i know it does in the quad (thanks to bolserst)
i know damping lowers resonance a bit to but how much ? (i used damping right now and without it it would hit 65hz.. and ugly 🙂 so it lower a huge amount. at a slight cost of output)
lastly making it push pull compared to single ended i believe it should lower it as well. but then again how much?
any one have a slight idea. ofcourse it does not have to be perfect! but it might save 1000 testers 😉 and maybe what quad does with 70 hz panels (but using four to play 50hz) might not work at all for planar magnetics. since the foil is ... heavy compared to the quads
Questions are more along the line of adding more panels how much would the resonance lower ? if any with planar magnetics. i know it does in the quad (thanks to bolserst)
i know damping lowers resonance a bit to but how much ? (i used damping right now and without it it would hit 65hz.. and ugly 🙂 so it lower a huge amount. at a slight cost of output)
lastly making it push pull compared to single ended i believe it should lower it as well. but then again how much?
any one have a slight idea. ofcourse it does not have to be perfect! but it might save 1000 testers 😉 and maybe what quad does with 70 hz panels (but using four to play 50hz) might not work at all for planar magnetics. since the foil is ... heavy compared to the quads
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Here are my amateurish thoughts:
Push-pull in ESLs is the "secret sauce" that automatically cancels certain bad sources of distortion you'd have with single-side motivation.
All mechanical objects that float/vibrate have their resonance point. Like heavy cones pushing against light air. Stupid when the resonance is within the pass-band, as with audio subs resonating at say 35 Hz. But when you have very light panels (or sheets of SaranWrap) the light air damps the resonance to a degree that makes its movement immaterial to the sound.
Push-pull in ESLs is the "secret sauce" that automatically cancels certain bad sources of distortion you'd have with single-side motivation.
All mechanical objects that float/vibrate have their resonance point. Like heavy cones pushing against light air. Stupid when the resonance is within the pass-band, as with audio subs resonating at say 35 Hz. But when you have very light panels (or sheets of SaranWrap) the light air damps the resonance to a degree that makes its movement immaterial to the sound.
You will see the same resonance lowering behavior with planar magnetics as with ESLs, but changes will be smaller the heavier the planar diaphragm + conducting traces are. You can get an idea of how much a second adjacent planar will lower resonance by just measuring one planar as a “naked” dipole, and then in a large flat baffle. As a point of reference, I measured the BG Neo8 resonance to lower about 10%-15%.
What type of damping material are you using? If it is thin mesh stretched tight and glued to magnets, it should not lower the resonance frequency, only damp it.
That is much tougher to estimate, depending on the magnet thickness, % open area, and air-gap thickness. For the BG Neo8 geometry, the resonance lowers by about 15%-20% when going from single ended to the OEM push-pull configuration.
It seems to me that the most natural damper for the working diaphragm would be the same diaphragm, but strongly crumpled by hand, and then stretched on the frame with a slight sag, that is so that it does not create resistance to the main working diaphragm.
The frame with such a membrane should be tightly pressed to the stator, on the other side of the panel to do exactly the same.
Thus, we will tie additional mass of air to the working diaphragm, which will serve as a damping way.
In Stax headphones such membranes are called "protective" against dust, but they are primarily damping.
The frame with such a membrane should be tightly pressed to the stator, on the other side of the panel to do exactly the same.
Thus, we will tie additional mass of air to the working diaphragm, which will serve as a damping way.
In Stax headphones such membranes are called "protective" against dust, but they are primarily damping.