Yes, but this begins to become significant perhaps an octave or two before the onset of breakup, it is a continuous function of frequency, a product of the flexibility of the cone and its response to dynamics of vibration and travelling waves.
Unfortunately, low mass is a goal too, also 'lossy' material and euphonically pleasing modes of vibration.
The coil 'feels' the mechanical impedance of the cone it is connected to, and moves accordingly, driving force being fixed. Without feedback VC will move according to mechanical impedance then, but with feedback it will move independently of mechanical impedance (in principle). It has to help I think, but can't compensate for all that happens as the cone flexes.
euphonics will not be taken into account.
as for lightness you have some leeway, because weight is saved in other areas.
That can be used to make the piston stiffer.
as for lightness you have some leeway, because weight is saved in other areas.
That can be used to make the piston stiffer.
Noob query.
If a music content has both high and low frequency content combined, can one simulate it on a dummy voice coil and cone in vacuum, get data than apply filter to send it to a two way speakers ? OR digitally process the modulated signal demodulate it as best as it can, apply filter and send it to two way speaker system ?
Regards.
If a music content has both high and low frequency content combined, can one simulate it on a dummy voice coil and cone in vacuum, get data than apply filter to send it to a two way speakers ? OR digitally process the modulated signal demodulate it as best as it can, apply filter and send it to two way speaker system ?
Regards.
The coil in your sim has no cone attached, so no load, no air brakes, nothing except pure inductance (plus maybe // and series loss resistances).
The way to sim it more realistically is to build a virtual speaker model that includes the electrical analogs of mechanical weight, spring, compliance, that sort of thing. But it still does not shows what happens with cone breakup etc. I guess physicists would model that in (in)finite element analysis software.
Jan
It is relatively easy to make an extremely rigid cone with composite materials if you understand how that is done. Without going into details of fiber orientation and matrix resin let's just say I have explored that type of design and found you have created as many problems as you think you are solving. Unless you are planning on using a device like that only up to the pistonic range and also have a very steep crossover slope you will see very ragged response above that range with many sharp resonances that are difficult to dampen in any physical way. There truly is a balance needed between the stiffness and damping properties of any cone and this is truly why paper composite cones are still the preferred material for the vast majority of cone drivers. All the attempts I have personally experienced of extremely rigid cone construction have been failures at wide-band reproduction.
One of the most successful at making this work was Rudy Bozak many years ago with anodized aluminum cones, but they were smaller cones, not large bass drivers and used in multiples so they could both produce low frequencies and also have a small enough diameter to be able to reach higher into the usable range.
One of the most successful at making this work was Rudy Bozak many years ago with anodized aluminum cones, but they were smaller cones, not large bass drivers and used in multiples so they could both produce low frequencies and also have a small enough diameter to be able to reach higher into the usable range.
There was also some ceramic-laminate material used I think by Infinity for midrange drivers that had a beneficial range of properties. The transducers thus were not asked to do huge excursions, but one could envision ones that could.
Snup,
Are you truly going to try and create your own paper? I've played with hemp in cones and didn't find any compelling reason to keep with it. Some of the problems with using hemp, at least here in the States was that it was hard to source. Another is that there is very little consistency between fibers, in a low weight composite part for the inside of your cars door panel who cares, but in a speaker cone you want consistency, good luck with that.
I would just look for a good supplier of reticulated fiber reinforced paper intended for speaker cones. You will at least be able to make two the same and get good results.
Are you truly going to try and create your own paper? I've played with hemp in cones and didn't find any compelling reason to keep with it. Some of the problems with using hemp, at least here in the States was that it was hard to source. Another is that there is very little consistency between fibers, in a low weight composite part for the inside of your cars door panel who cares, but in a speaker cone you want consistency, good luck with that.
I would just look for a good supplier of reticulated fiber reinforced paper intended for speaker cones. You will at least be able to make two the same and get good results.
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