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Electrovoice 18" Woofer: smallish Magnet; only 2.3 ohms?

I’ve been watching some electro-voice drivers, from their Vintage Model E-V Six, drawn by the 18" woofers,
original specs say 8 ohms

https://products.electrovoice.com/binary/E-V%20Six%20EDS.pdf

 here’s a pair of the woofers

https://www.ebay.com/itm/254646609730?hash=item3b4a1ee742:g:y-gAAOSwk19fBH44

1. 2.4 OHMS? My vintage drivers, Crossover, and L-Pads from that era are nominal 16 ohms. I never measured them.

2. Smallish Magnet on 18"? My 15" paper woofers, 15W 37 lbs, have much bigger magnets.  (the 18" are 1/2" thick styrofoam).

https://products.electrovoice.com/binary/15W,%2015BW,%2015WK,%2015BWK%20EDS.pdf

https://www.ebay.com/itm/284098370766?mkevt=1&mkcid=1&mkrid=711-53200-19255-0&campid=533...

3. Mine is 16 ohms, I know they make a 8 ohm version, yet that one shows 3.5 ohms???

Help me avoid trouble by ignorance please,

thanks, Elliott
elliottbnewcombjr
elliottbnewcombjr OP
5,378 posts
 
here is a 18Wk (see the small k stamped into the label) from a Patrician

https://www.ebay.com/p/28028667707?iid=254883146782
rodman99999
6,131 posts
 
     If your drivers did come out of an EV Six system: they should be a nominal 8 Ohm, far as what your amp's output will see, regardless of how they measure with DC.

     Everything changes, depending on the way the woofer is loaded and it's design parameters.

      ie: https://audiojudgement.com/speaker-impedance-curve-explained/#:~:text=Speaker%20impedance%20is%20not.... 
elliottbnewcombjr OP
5,378 posts
 
the prior 12/15/18 W's and WK's used huge alnico magnets

the 18" 1/2" thick foam driver uses a ceramic magnet, here are decent photos of a Model EV-Six with that foam woofer

http://www.fisherdoctor.com/ev.html



elliottbnewcombjr OP
5,378 posts
 
Vintage Electro-Voice Info, click on any individual image

http://www.hifilit.com/hifilit/Electro-Voice/Electro-Voice.htm

says the K versions were 3.2 ohms, "for Klipsch K Type Baffles"
elliottbnewcombjr OP
5,378 posts
 
OK, it's a 18WS, used in both the

Model EV-Six (4 way, 8 ohm system) 5 position resistor based optional frequency curves

https://products.electrovoice.com/binary/E-V%20Six%20EDS.pdf

and

Royal 400 (3 way, 2 AT-37 L-Pads, 8 ohm system)

https://products.electrovoice.com/binary/Royal%20400%20Manual.pdf

"a Special Woofer, 18WS, 4lb 10oz Ceramic Magnet"

I like learning this stuff, thanks for the help. That pair of Model EV-Six's is only 1 hour from my house which is why this stays in my unconscious.
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