SVC to DVC conversion

madstamm · 8th January 2008, 09:44 PM

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, 10:00 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, 10:04 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, 04:44 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, 06:41 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, 01:32 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?

Quote:

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

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

Ron E · 10th January 2008, 02:24 AM

parameters of your RF woofer in various connection configurations.

madstamm · 13th January 2008, 05:09 PM

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, 05:45 PM

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

8th January 2008, 09:44 PM	#1
madstamm diyAudio Member Join Date: Jan 2006 Location: Land Canaan	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

8th January 2008, 10:00 PM	#2
theAnonymous1 diyAudio Member Join Date: Feb 2004 Location: Anonymityville	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. __________________ "Men willingly believe what they wish" - Julius Caesar

9th January 2008, 04:44 AM	#4
GM diyAudio Member Join Date: Jun 2003 Location: Chamblee, Ga.	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 __________________ Loud is Beautiful if it's Clean! As always though, the usual disclaimers apply to this post's contents.

13th January 2008, 05:45 PM	#9
Ron E diyAudio Member Join Date: Jun 2002 Location: USA, MN	The coils are interleaved, when connected in parallel they act like a single coil with a larger winding. __________________ Science is a way of thinking much more than it is a body of knowledge. --Carl Sagan

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8th January 2008, 10:04 PM	#3
madstamm diyAudio Member Join Date: Jan 2006 Location: Land Canaan	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

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