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-   -   SVC to DVC conversion (http://www.diyaudio.com/forums/subwoofers/115087-svc-dvc-conversion.html)

madstamm 8th January 2008 08:44 PM

SVC to DVC conversion
 
Hello All,

Does anyone have a guide to calculating equivalent T/S parameters for modeling DVC drivers?

Some datasheets annoyingly only list the parameters for one coil...


Looking for something like the following:

Parameter 1 Voicecoil ParConfig SerConfig
BL 1 2 2
Re 1 0.5 2
Le 1 0.5 2
Vas 1 ? ?

etc...

any help much appreciated!

cheers,

Mike

theAnonymous1 8th January 2008 09:00 PM

I think the norm for DVC driver specs is for both voice coils in parallel. So if you only see a single set of specs it would be safe to assume it is for parallel voice coils. You can usually tell by the Re value given.

madstamm 8th January 2008 09:04 PM

hmmm.... are you sure? check out this pdf and tell me what you think... seems weird that they'd specifially show 2x Re and nothing such on all other specs...

Rockford RFR2212 DVC

thanks!
mike

GM 9th January 2008 03:44 AM

2 x 4 ohms just means both VCs are nominally 4 ohms. Anyway, below the specs it clearly states that the VCs were wired in parallel (nom. 2 ohm) for T/S measurements.

Anyway, here's what you asked for: http://www.subwoofer-builder.com/driver-conversions.htm

GM

madstamm 9th January 2008 05:41 PM

Quote:

Anyway, below the specs it clearly states that the VCs were wired in parallel
My bad ... :-P

thanks! though that chart is not quite right either - voltage sensitivity with series config is NOT the same as with one coil...

makes one wonder about accuracy of the rest.

hm, might actually have to sit down and do this myself... ;)

cheers,
m

Ron E 10th January 2008 12:32 AM

Quote:

Originally posted by madstamm
thanks! though that chart is not quite right either - voltage sensitivity with series config is NOT the same as with one coil...

Are you sure? :D

Quote:

Originally posted by madstamm
makes one wonder about accuracy of the rest.

hm, might actually have to sit down and do this myself... ;)

:o

Ron E 10th January 2008 01:24 AM

2 Attachment(s)
parameters of your RF woofer in various connection configurations.

madstamm 13th January 2008 04:09 PM

shortsighted...
 
eheheheee... so i suppose this thread is a good example of how to make a fool of oneself ... my grade-school teachers always said i was unusually prone to thoughtless error ;)

my reasoning neglected the additional EM force generated by the coil, excuse me.

Quote:

parameters of your RF woofer in various connection configurations.
thanks.. now after thoughtfully checking your pdf, i think its fair to say that the coils in parallel should have an Le of 1mH instead of 2mH, correct?

cheers,

Humili-mike

Ron E 13th January 2008 04:45 PM

The coils are interleaved, when connected in parallel they act like a single coil with a larger winding.


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