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Old 14th February 2011, 03:18 PM   #1671
epa is offline epa  Netherlands
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Quote:
Originally Posted by David McBean View Post
I should have perhaps added that the external inductor will act simply as a low-pass filter :-).
tnx again david.
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?
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Old 15th February 2011, 03:10 AM   #1672
NEO Dan is offline NEO Dan  United States
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Multiple enclosure coupling applies to rear vented tuning, is this accurate?

When simulating mulitples of a rear vented alignment, HR significantly lowers tuning of the total system.
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Old 15th February 2011, 08:21 AM   #1673
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Quote:
Originally Posted by epa View Post
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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Last edited by David McBean; 15th February 2011 at 08:23 AM.
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Old 15th February 2011, 08:31 AM   #1674
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Quote:
Originally Posted by NEO Dan View Post
Multiple enclosure coupling applies to rear vented tuning, is this accurate?
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
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Old 15th February 2011, 01:03 PM   #1675
Jmmlc is offline Jmmlc  France
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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


Quote:
Originally Posted by NEO Dan View Post
Multiple enclosure coupling applies to rear vented tuning, is this accurate?

When simulating mulitples of a rear vented alignment, HR significantly lowers tuning of the total system.
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Old 15th February 2011, 01:58 PM   #1676
Mark Kravchenko
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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....
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Old 16th February 2011, 02:19 AM   #1677
NEO Dan is offline NEO Dan  United States
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Default Hornresp dependencies

Hi David,
If I were stripping windows down to only what was required to run Hornresp what would I need?
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Old 16th February 2011, 08:47 AM   #1678
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Originally Posted by NEO Dan View Post
If I were stripping windows down to only what was required to run Hornresp what would I need?
Hi Dan,

Sorry, but I have no idea on that one :-).

Kind regards,

David
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Old 16th February 2011, 04:08 PM   #1679
epa is offline epa  Netherlands
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Quote:
Originally Posted by NEO Dan View Post
Hi David,
If I were stripping windows down to only what was required to run Hornresp what would I need?
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?
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Old 17th February 2011, 06:40 AM   #1680
NEO Dan is offline NEO Dan  United States
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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.
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