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MAY 2018

 

I purchased a Dayton Audio DATS impedance analyzer V2

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This tool is very useful for confirming speaker parameters and finding break-up mode (they often show up on the impedance plot)

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Often, manufacturers are optimistic on specifications (Tang Band comes to mind) and designing an enclosure using published data  which never yield best results.

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Below is a measurement value of a Scan Speak 18W8424G00 (Discovery series) I happened to have on hand.

  • Qes from Scan Speak is supposedly 0.51

  • The measured Qes comes in at 0.67!!! (30% more)

  • Qts obviously changes because of the Qes.

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  • This speaker is well burned in, so this much difference is surprising, from a reputable manufacturer like Scan Speak.

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  • The VAS is also double the specified value!

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  • FS is reasonably close.

  • MMS is also close enough.

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  • However, with such an QES variance, this means that before cutting a box, speaker measurements are mandatory!

Remember, I have a French mother tongue, doing my best to express myself in the Shakespeare language.

Thanks to a friend, Bevis, most of my website has been corrected for proper English grammar, much easier read now :)

 

Any suggestion/comments,  feel free to E-mail me.

mapoulin@gmail.com

Update May 2024: this website won't be updated for a while as WIX decided to max storage capacity at 500 Mb unless you pay a monthy fee to obtain more storage (the site is already at 2.4 Go).

I may merge the site to another server or find a solution but in the meantime, I can't add anything but text, Sorry
 

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