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

      Electro-voice made their 15" and 18", W Series woofers in two versions.     The WK types were specifically designed for use in corner-horn (K-type) enclosures, with a restricted enclosure volume and a horn-loaded output.

       Though they were both rated as 16 Ohm nominal: the K types spec at 3.2, as opposed to the W's 11.6, with DC.

        The W types were designed for infinite baffle enclosures.

        There were also 15BW and 15BWK versions, that had a smaller voice-coil (2") and lighter magnet structure, than the W and WKs (2.5" VC).

     btw: That last link shows a driver with just one of the many magnet ENCLOSURES that EV used, over the years.

     That's not the actual magnet structure (front plate, magnet and pole/rear plate).

That would be resistance not impedance. Efficiency was a major factor back then because amplifiers were not that powerful. If you are stuck on flea watt amps these old drivers are great it they are in decent shape which is unlikely. Most of them will require remanufacture at some level. 
I can understand collecting old cars they are art but not old audio equipment. Modern material science has improved drivers particularly suspensions. There are many modern High efficiency woofers available up to 32"! https://ds18.com/products/tm-sn32-32-troublemake-subwoofer?currency=USD&variant=13961390850109&a...

rodman99999

thanks for the clarifications. 

Now I see the spec sheets have a separate DC resistance line, thus the 15W link I posted must be a 15WK.

The 18" drivers I found, the foam ones in the Model EV-Six are NOT 18W or 18WK

18W and 18WK are bigger versions of my 15W (or 15WK), with monster magnets as you would expect

https://www.manualslib.com/manual/43604/Electro-Voice-18w.html

the Model EV-Six has 1/2" thick foam cones, the smaller magnets.

I don't know what their impedance was, or, if the DC resistance of 2.4 ohms is 'good/normal' or problematic.

??? Anyone know the specs of the 18" 1/2" thick cone driver???

here is a 18Wk (see the small k stamped into the label) from a Patrician

https://www.ebay.com/p/28028667707?iid=254883146782