Hi Oliver,
Unfortunately, the enhancements you are seeking would require a lot of work - something I am not in a position to do at this time. Setting L12 = 0.10 cm in the current tapped horn model should however achieve effectively the same result - although granted, an additional segment does not become available.
It could be an interesting exercise to build your suggested model in AkAbak and then compare the results with the Hornresp L12 = 0.10 approximation to see if the differences are of practical significance.
In the meantime, please keep a lookout for any bugs...
.Kind regards,
David
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It sure does. Sampling it 533 times however becomes a little more workAnd here's me thinking that the Sample tool already provided "more than sufficient" information
I would be fine with it just automatically sampled the tool at all frequencies the normal export function does and dump it into a file with similar structure.
It's usefulness may not be known until it is implemented.From a practical viewpoint I wonder just how useful such additional data might be - it seems that there is enough confusion out there already, when it comes to interpreting the Hornresp Maximum SPL chart
If a "script" is made for the sample tool it's behavior would carry over to all graphs it samples.
A current limit (or current shown in sample tool) might be useful as is relates to a limit imposed by VC wire area or cable area. Or max amp current if you want. Due to phase it might be hard to calculate from the power given.
As Rg loss is ignored when power is shown I guess it is best to leave it "out"(in) here as well. So voltage at the VC. Can't hurt to do both though.
I guess phase is the same as the electrical phase already exported, so it might not be necessary.
This is an advanced feature not used very often so optimization on speed is not a priority.
On any normal computer today it should not be a problem though.
Keep it in mind and see what happens. Only you knows the coding involved and how it might be solved, and if it's worth the time compared to other things.
Hi Oliver,
I couldn't resist checking for myself
.The attached Excel chart compares the AkAbak result for a tapped horn having the first diaphragm side facing axially into the throat at S1, against the standard Hornresp result for the same tapped horn, but with L12 = 0.10 cm and S1 = S2.
As expected, the results are essentially identical.
Kind regards,
David
Attachments
Hi David_Web,
Thanks for your comments.
I will have a look when I get a chance - I'm not promising anything, though
.Kind regards,
David
i have a question about the le input in hr.
in ts parameterrs the value usualy is given @ 1khz and sometimes also @ 10 khx
i always thought that the le value was a static nr,but recently i discoverd that the value decreases with increasing frequenty.
this pic is from a typical beyma woofer ,le =2.4 @ 1khz as given in
th small parameters
when moddeling a subwoofer in the range of 30hz > 120 hz ,shouldnt the le vallue be according to the le vallue in that freq band?
reason for asking is sometimes inserting (adding coil) a higher le value gives a smoother responce in the pasband.
in ts parameterrs the value usualy is given @ 1khz and sometimes also @ 10 khx
i always thought that the le value was a static nr,but recently i discoverd that the value decreases with increasing frequenty.
this pic is from a typical beyma woofer ,le =2.4 @ 1khz as given in
th small parameters
An externally hosted image should be here but it was not working when we last tested it.
when moddeling a subwoofer in the range of 30hz > 120 hz ,shouldnt the le vallue be according to the le vallue in that freq band?
reason for asking is sometimes inserting (adding coil) a higher le value gives a smoother responce in the pasband.
Hi epa,
The Hornresp simulation model assumes a perfect inductor, where the value of the inductance is independent of frequency. The reactance of that inductance will however increase with frequency:
Reactance (ohms) = 2 * Pi * frequency (hertz) * inductance (henrys)
Yes, as far as specifying just the inductance of the driver voice-coil is concerned.
The value of an external inductor can be added to the driver voice-coil value if so desired, to modify the overall system response:
Le = L external + L voicecoil
Kind regards,
David
The Hornresp simulation model assumes a perfect inductor, where the value of the inductance is independent of frequency. The reactance of that inductance will however increase with frequency:
Reactance (ohms) = 2 * Pi * frequency (hertz) * inductance (henrys)
Yes, as far as specifying just the inductance of the driver voice-coil is concerned.
The value of an external inductor can be added to the driver voice-coil value if so desired, to modify the overall system response:
Le = L external + L voicecoil
Kind regards,
David
Hi David_Web,
Values for the following parameters have been now been added to the standard exported chart data list.
They are included even when the Maximum SPL tool is not used.
Ein - Loudspeaker system input voltage
Pin - Loudspeaker system input power
Iin - Loudspeaker system input current
IPhase - Phase difference between Iin and Ein
Product Number 2830-110214 refers.
Kind regards,
David
I should have perhaps added that the external inductor will act simply as a low-pass filter
.tnx again david.I should have perhaps added that the external inductor will act simply as a low-pass filter
i know its a passive component,but in use of a sub its not much an isu.
when i look at most graps of inductance,i see that for a sub the le value @100 hz is ~(near enough)double that of 1 khz .
so i double the le value (i.e.0.9mh >1,8mh)in hr when modeling a sub 30>100 hz.
is this assumption about wright?
Hi epa,
It seems like a reasonable thing to do, but I don't really know for sure
.Others with more practical experience in these matters would be in a better position to comment.
Obviously though - the closer the theoretical value of Le is to the actual value over the frequency range of interest, the more accurate the predictions are likely to be.
You might like to try varying the value of Le using the Hornresp Loudspeaker Wizard to see how much the results change. You may find that for your proposed system, at sub-woofer frequencies, the differences are not that great anyway
.Kind regards,
David
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Hi Dan,
As far as I know, the simulation model should be okay. I haven't seen any comparisons of predicted versus measured results for such systems, so I am not in a position to comment on accuracy.
Kind regards,
David
Hello,
May I suggest that the value of the source resistor (Rg) doesn't have the same influence on the equivalent Qe in the case of a single loudspeaker than in the case of multiple loudspeakers.
Qe = Qes . ((Re + Rg)/Re)
and then on the equivalent Qts.
As the resonance frequency is given by:
Fb(Hz)=Ka*Fs/Qts
A variation in the Qts will induce a variation in Fb.
(In the case the source resitor is Rg = 0 then there should not be any difference...)
Best regards from Paris, France
Jean-Michel Le Cléac'h
May I suggest that the value of the source resistor (Rg) doesn't have the same influence on the equivalent Qe in the case of a single loudspeaker than in the case of multiple loudspeakers.
Qe = Qes . ((Re + Rg)/Re)
and then on the equivalent Qts.
As the resonance frequency is given by:
Fb(Hz)=Ka*Fs/Qts
A variation in the Qts will induce a variation in Fb.
(In the case the source resitor is Rg = 0 then there should not be any difference...)
Best regards from Paris, France
Jean-Michel Le Cléac'h
Just throwing this out for discussion:
Is there a possibility that as in the case of multiple horns exhibiting different behavior due to mutual coupling there are multiple vents coupling?
In a single enclosure that can be the case when you have a multitude of vents. Rarely does the calculated length work when there are four vents on the same baffle plane. When there are multiple vents to achieve low vent velocity and the diameter is small due to baffle restrictions....
Is there a possibility that as in the case of multiple horns exhibiting different behavior due to mutual coupling there are multiple vents coupling?
In a single enclosure that can be the case when you have a multitude of vents. Rarely does the calculated length work when there are four vents on the same baffle plane. When there are multiple vents to achieve low vent velocity and the diameter is small due to baffle restrictions....
hr is a standalone program ,doesnt need regestry settings.
you need an xp lite version, nothing fancy.
if you were running mac os use a virtual machine?
Hi epa,
I am attempting to get it running on my MBP under WineBottler, I normally run a full XP VM under Fusion but I am considering an instance of XP via bootcamp for a measurement platform. This being my first attempt with a Wine based VM I am feeling around in the dark, hence the question on dependencies.
I am attempting to get it running on my MBP under WineBottler, I normally run a full XP VM under Fusion but I am considering an instance of XP via bootcamp for a measurement platform. This being my first attempt with a Wine based VM I am feeling around in the dark, hence the question on dependencies.