Hi Oliver,
The throat velocity chart has been replaced by the diaphragm velocity chart. The Sample tool can still be used with the SPL response chart to calculate the horn throat peak particle velocity at specified frequencies, if so required.
When resonances are unmasked and a throat chamber is present, it is not possible to directly calculate the throat velocity from the diaphragm velocity.
Kind regards,
David
"Insanity - doing the same thing over and over again and expecting different results."
Albert Einstein
.
Yes, said zero degree...meant zero dB
Are you going to measure them?
Yes, said zero degree...meant zero dB
Hi AllenB,
I thought that might be the case, so I posted a more detailed description of the change to hopefully clarify things for everyone
.Kind regards,
David
Hi Oliver,
Is being able to sample throat velocity values at specific frequencies sufficient for your purposes, or would it be more helpful to have the complete set of values plotted on a chart, as was done previously?
I would like to gain a better understanding of the relative merits of the various charts we have now tried, and how the data they present can be used in a practical sense. Also, are there perhaps other more useful charts that should be included in Hornresp, either as additions or as optional choices?
To summarise -
Old charts:
Throat sound pressure - how is this information used?
Throat particle velocity - how is this information used?
New charts:
Diaphragm pressure - how is this information used?
Diaphragm velocity - how is this information used?
Other charts:
???????
Comments (by anyone) on how a given chart can assist in the loudspeaker design process, would be much appreciated.
Kind regards,
David
Velocity for a given frequency along the horn axis would be very helpful to place dampening material. Also velocity for all frequencies given a position along the axis would be helpful in determining which frequencies will be most affected by dampening material at this point.
Diaphragm pressure is useful for estimation of the shear force on the diaphragm.
Throat particle velocity is useful for estimation of compression/depression distortion.
Diaphragm pressure is useful for estimation of the shear force on the diaphragm.
Throat particle velocity is useful for estimation of compression/depression distortion.
Hi Mårten,
Thanks for your comments. When you say "diaphragm pressure is useful for estimation of the shear force on the diaphragm", would the actual force acting on the diaphragm in newtons perhaps also be a handy chart to have? I assume that the force values could be calculated from Mmd and the diaphragm acceleration?
Kind regards,
David
David
That would be very handy. I have no idea on how to calculate it, the calculation include mechanics. There is pressure on one side of the cone, and the voice coil force on the other side.
I have started another thread on the subject.
There must be someone on the forum educated enough in mechanics to help you out.
That would be very handy. I have no idea on how to calculate it, the calculation include mechanics. There is pressure on one side of the cone, and the voice coil force on the other side.
I have started another thread on the subject.
There must be someone on the forum educated enough in mechanics to help you out.
Yes, soon enough. I'm trying to get the rear chamber sized then I'll want to know whether I need a phase plug.
Post #3233
Hi David,
I liked the throat particle velocity data as it gives me a quick view at the behaviour of the air not just for a horn, but e.g.: at the inside end of a bass-reflex vent. Particle velocity does not quite align w/ SPL or impedance, so it was nice to have the chart.
But, there are other forum members who use Hornresp to actually build speakers, for me it is just an area of interest and learning, so I'd rather you take input from e.g.: mwmkravchenko, jbell or NEO Dan (I know, there is a long list) than from me.
Regards,
Hi David,
I liked the throat particle velocity data as it gives me a quick view at the behaviour of the air not just for a horn, but e.g.: at the inside end of a bass-reflex vent. Particle velocity does not quite align w/ SPL or impedance, so it was nice to have the chart.
But, there are other forum members who use Hornresp to actually build speakers, for me it is just an area of interest and learning, so I'd rather you take input from e.g.: mwmkravchenko, jbell or NEO Dan (I know, there is a long list) than from me.
Regards,
@ David McBean
I definately wasn't proposing for you to include multiple filters Just a variable HPF to alleviate excursion. This is what i expect everyone that has requested it would Really appreciate
As i'm sure you realise only too well, taking the virtual design into an actual build, will require a HPF to protect the driver/s. Without being able to simulate designs with an HPF in place, means we are missing a crucial part of the bigger picture
It really would help, & be the icing on the cake
I definately wasn't proposing for you to include multiple filters
Just a variable HPF to alleviate excursion. This is what i expect everyone that has requested it would Really appreciate As i'm sure you realise only too well, taking the virtual design into an actual build, will require a HPF to protect the driver/s. Without being able to simulate designs with an HPF in place, means we are missing a crucial part of the bigger picture
It really would help, & be the icing on the cake