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[Antone Atmarama Bajor]

     I'm trying to play with some Linkwitz Transform circuit stuff but I can't find the conversion factor to change speakers Rms to Ns/m.

    I can convert from lb/s, mohms, and kg/s.  Does anyone know a conversion factor I can use to get to Ns/m???

    I found something for
Viscosity - absolute   lbm/ft s   N s/m^2   1.4881   0.6720

But that isn't the same thing.  At least I don't think it is.

Anyhow Thanks.

Antone-

    P.S.  Anyone have any feelings on Linkwitz transform equalization circuits Vs using a dual integrator for sealed box?  They look like they are close to the same thing.  Only the Linkwitz isn't just two identical integrators in series.

   

[Iain_Macdonald]

Hi Antone,

The conversion from (FORCE)lbf to N is mutiply by 4.4484

I have attached a couple of pdfs in a Zip file, with conversion  factors to SI, just in case I didn't give you the one you wanted.

Iain.

[Antone Atmarama Bajor]

Thanks for the conversion chart.

    I can't specifically find lb/s or Ns/m.
Is the drivers rms the surrounds Viscosity?  Ns/m^2 doesn/t = Ns/m.  Maybe the Spreadsheet on the Linkwitz Labs site has a typo and he really means Ns/m^2.  I've seen Drivers spec-ed with Ns/m as the rms.

Hrm.  Well the Linkwitz Transform spreadsheet has an Example driver already loaded I guess I can see if my Bass Box pro has that driver in its Database and see If I can figure the conversion factor.

    Nice Chart though!!!

Antone-

[Iain_Macdonald]

Hi,

Look at pound, it's there.

You can also look at this linked site.

Iain.

http://www.sengpielaudio.com/ConvForce.htm

[Antone Atmarama Bajor]

hmmm.  Does Ns just equal N (Newtons)  or does Ns Equal Newtons Per second or Newtons times Seconds?

I'm assuming lb/s translates into (lb f/s) Pounds of force per second.

    Ns/m to me translates into Newtons times seconds per meter?


    I think I have the values to play with I'll se what I can figure out.

Thanks again.

Antone-

   

[Peter Morris]

It’s the drivers suspension mechanical resistance or losses and its newton.sec/m (force over velocity if you like)

A newton is Kg.m/sec^2 , substituting that  gives us  (Kg.m/sec^2).sec/m = kg/sec which is the other unit you see it expressed in … and there are 2.204 lb in a Kg….

therefore 2.204 lb/s = 1 Kg/s = 1 N.s/m

Its not an important parameter - many people ignore it !

FWIW absolute viscosity is expressed as Pascal.sec  A pascal is N/m^2 so viscosity is Newton.sec/m^2 as you found. So I guess you could also say Rms is Pa.m.s


I hope that helps.

Peter

[Peter Morris]

Antone Atmarama Bajor wrote on Mon, 28 November 2005 22:35

hmmm.  Does Ns just equal N (Newtons)  or does Ns Equal Newtons Per second or Newtons times Seconds? I'm assuming lb/s translates into (lb f/s) Pounds of force per second.     Ns/m to me translates into Newtons times seconds per meter?     I think I have the values to play with I'll se what I can figure out. Thanks again. Antone-

N = Newtons, S = seconds N.s = Newtons x Seconds

a lb is a mass, a lbf is a force - not quite the same.

2.204 lb is the same a 1 Kg, 0.225 lbf is the same as 1 N

[Antone Atmarama Bajor]

I got 2.20507.

    I just divided the numbers I found for a driver

(lb/s)/(Ns/m)=ratio.

    Yours might be a little closer.  But I'm still close with that.

    Thank you!!!!

Antone-