zaphs impedance measurements

omni · 5th July 2006, 02:54 PM

How accurate are the impedance measurements Zaph does? Has anyone worked with his parameters in their projects? I have one of the drivers that he tested and was wondering if his results were accurate enough to work from. Specifically, the Seas CA15RLY midbass which was in his latest test group, and the Seas 27TDFC, which is listed in his tweeter mishmash. Any input? Thank you............

Salas · 5th July 2006, 04:03 PM

Dont know about Zaph, but I use Soundeasy (as he does) and Leap and WinMLS and WooferTesterII, and I prefer WooferTesterII for accuracy.

sreten · 5th July 2006, 05:00 PM

Hi,

Seas own specifications are usually very accurate :

http://seas.no/seas_line/woofers/h1216.pdf

So I'd cross check Zaphs result with specification.

For manafacturers with poor accuracy of specification I'd
much rather go on a set of Zaphs measurements than
the paper specification, though for drivers with poor
consistency you can never be sure.

/sreten.

planet10 · 5th July 2006, 06:41 PM

impedance plots -- all accurate -- will differ depending on the level of drive used. If you use a computer & sound card you get a low voltage drive. If you do it manually (for instance) and have a larger drive (say 1 V) the Fs will be lower and the Vas higher than in the low voltage situation.

For sealed boxes the parameters change in such a manner that you end up with about the same box size.

(all the above is paraphrased from a post by Dan Wiggins -- my experience with Fuzzmeasure is in line with this)

You also have to keep in mind that legitimate driver-to-driver variation can be up around 20%.

dave

5th July 2006, 02:54 PM	#1
omni diyAudio Member Join Date: Feb 2006 Location: Rossford, Ohio	zaphs impedance measurements How accurate are the impedance measurements Zaph does? Has anyone worked with his parameters in their projects? I have one of the drivers that he tested and was wondering if his results were accurate enough to work from. Specifically, the Seas CA15RLY midbass which was in his latest test group, and the Seas 27TDFC, which is listed in his tweeter mishmash. Any input? Thank you............

5th July 2006, 06:41 PM	#4
planet10 frugal-phile(tm) diyAudio Moderator Join Date: Oct 2001 Location: Victoria, BC, NA, Sol III Blog Entries: 4	impedance plots -- all accurate -- will differ depending on the level of drive used. If you use a computer & sound card you get a low voltage drive. If you do it manually (for instance) and have a larger drive (say 1 V) the Fs will be lower and the Vas higher than in the low voltage situation. For sealed boxes the parameters change in such a manner that you end up with about the same box size. (all the above is paraphrased from a post by Dan Wiggins -- my experience with Fuzzmeasure is in line with this) You also have to keep in mind that legitimate driver-to-driver variation can be up around 20%. dave __________________ community sites t-linespeakers.org, frugal-horn.com ........ commercial site planet10-HiFi p10-hifi forum here at diyA

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5th July 2006, 04:03 PM	#2
Salas diyAudio Chief Moderator Join Date: Oct 2002 Location: Athens-Greece	Dont know about Zaph, but I use Soundeasy (as he does) and Leap and WinMLS and WooferTesterII, and I prefer WooferTesterII for accuracy.

5th July 2006, 05:00 PM	#3
sreten diyAudio Member Join Date: Nov 2003 Location: Brighton UK	Hi, Seas own specifications are usually very accurate : http://seas.no/seas_line/woofers/h1216.pdf So I'd cross check Zaphs result with specification. For manafacturers with poor accuracy of specification I'd much rather go on a set of Zaphs measurements than the paper specification, though for drivers with poor consistency you can never be sure. /sreten.

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