Contact information for Vance Dickason

haemphyst · 4th June 2007, 08:43 PM

I am having a bit of an issue, regarding the "proper use" of DVC woofers, and I was hoping somebody might have contact information for Mr. Vance Dickason. I am trying to get as much input from as many people as I possibly can.

I have already gotten results from Dan Wiggins (of Adire Audio), Tom Bohlender (of Wisdom Audio), Thilo (of TCSounds), and two (personal friends of mine) loudspeaker engineers from Harman, in Northridge, CA, who asked to remain nameless. So far, everything seems to be leaning toward my point of view, but I have ONE person in my argument, who has suddenly thrown Mr. Dickason's name into the mix. I'd simply like to get his opinion, now.

For those of you interested in the argument, here it is. I have not, as of yet, posted complete input results from the above mentioned names, although my posts have both been based on responses from Dan Wiggins, and my driver engineer friends from Harman.

Mikey p · 5th June 2007, 01:07 AM

Vance Dickason can be contacted at vdc@northwest.com

haemphyst · 5th June 2007, 08:27 PM

Thankie!

~~Muchly appreciated~~

RDV · 5th June 2007, 08:51 PM

http://mobile.jlaudio.com/support_pages.php?page_id=163

This might help.

Or not.

RDV

richie00boy · 5th June 2007, 09:57 PM

The answer is quite simple. By only using one coil you simply halve the efficiency and reduce somewhat the thermal power capacity of the drive unit. Thiele-Small parameters remain the same as if the coils were driven series or parallel.

However, you can fiddle with the Thiele-Small parameters by adding resistance across the undriven coil.

Cal Weldon · 5th June 2007, 10:01 PM

It seems a bit of a moot point. If you don't intend to use both coils, why use that woofer?

haemphyst · 7th June 2007, 05:21 AM

I was wondering if anybody actually read the thread I linked to... Seems everybody was willing to offer up suggestions, regarding why one should or shouldn't do it, (mostly "shouldn't", but if anyone had read the thread I linked to, they would have known that there were VERY valid and solid arguments as to why it is perfectly acceptable to run only one coil...) but all I was asking for was a way to contact Mr. Dickason.

I got the contact information I asked for, and I will soon be (hopefully) receiving a reply from Mr. Dickason, and I will place that reply on the12volt.

Cloth Ears · 7th June 2007, 06:15 AM

You can run them in parallel (if your amp can handle it), in series, using only one voice-coil or even running both voice-coils using different channels (a mate used to run his Tumult like that).

richie00boy mentioned in his post what the ramifications are. What you actually do it up to you.

"There is no should, or should not. There is only do, or do not."
(apologies to master Yoda)

4th June 2007, 08:43 PM	#1
haemphyst diyAudio Member Join Date: Jun 2004 Location: Sunny Southern California	Contact information for Vance Dickason I am having a bit of an issue, regarding the "proper use" of DVC woofers, and I was hoping somebody might have contact information for Mr. Vance Dickason. I am trying to get as much input from as many people as I possibly can. I have already gotten results from Dan Wiggins (of Adire Audio), Tom Bohlender (of Wisdom Audio), Thilo (of TCSounds), and two (personal friends of mine) loudspeaker engineers from Harman, in Northridge, CA, who asked to remain nameless. So far, everything seems to be leaning toward my point of view, but I have ONE person in my argument, who has suddenly thrown Mr. Dickason's name into the mix. I'd simply like to get his opinion, now. For those of you interested in the argument, here it is. I have not, as of yet, posted complete input results from the above mentioned names, although my posts have both been based on responses from Dan Wiggins, and my driver engineer friends from Harman.

5th June 2007, 09:57 PM	#5
richie00boy Did it Himself diyAudio Member Join Date: Nov 2003 Location: Gloucestershire, England, UK	The answer is quite simple. By only using one coil you simply halve the efficiency and reduce somewhat the thermal power capacity of the drive unit. Thiele-Small parameters remain the same as if the coils were driven series or parallel. However, you can fiddle with the Thiele-Small parameters by adding resistance across the undriven coil. __________________ www.readresearch.co.uk my website for UK diy audio people - designs, PCBs, kits and more

5th June 2007, 10:01 PM	#6
Cal Weldon Speakerholic diyAudio Moderator Join Date: Jan 2004 Location: British Columbia	It seems a bit of a moot point. If you don't intend to use both coils, why use that woofer? __________________ Next stop: Margaritaville Some of Cal's stuff \| Cal Weldon Consulting

7th June 2007, 06:15 AM	#8
Cloth Ears diyAudio Member Join Date: Dec 2001 Location: Melbourne, Australia	You can run them in parallel (if your amp can handle it), in series, using only one voice-coil or even running both voice-coils using different channels (a mate used to run his Tumult like that). richie00boy mentioned in his post what the ramifications are. What you actually do it up to you. "There is no should, or should not. There is only do, or do not." (apologies to master Yoda) __________________ Jont. "It is impossible to build a fool proof system; because fools are so ingenious."

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5th June 2007, 01:07 AM	#2
Mikey p diyAudio Member Join Date: Feb 2004 Location: Sask. Canada	Vance Dickason can be contacted at vdc@northwest.com

5th June 2007, 08:27 PM	#3
haemphyst diyAudio Member Join Date: Jun 2004 Location: Sunny Southern California	Thankie! ~~Muchly appreciated~~

5th June 2007, 08:51 PM	#4
RDV diyAudio Member Join Date: Sep 2005	http://mobile.jlaudio.com/support_pages.php?page_id=163 This might help. Or not. RDV

7th June 2007, 05:21 AM	#7
haemphyst diyAudio Member Join Date: Jun 2004 Location: Sunny Southern California	I was wondering if anybody actually read the thread I linked to... Seems everybody was willing to offer up suggestions, regarding why one should or shouldn't do it, (mostly "shouldn't", but if anyone had read the thread I linked to, they would have known that there were VERY valid and solid arguments as to why it is perfectly acceptable to run only one coil...) but all I was asking for was a way to contact Mr. Dickason. I got the contact information I asked for, and I will soon be (hopefully) receiving a reply from Mr. Dickason, and I will place that reply on the12volt.

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