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

       What do want to know?  

       In your first post and again 07-18-2021 10:10am: you asked about a nominal speaker spec (8 Ohm) vs a DC spec.

       Again: if your 18" woofers came out of either EV Six or 400 systems: an amplifier's outputs will see a nominal impedance of 8 Ohms, playing music into them.

       Why are you concerned about EV's magnet structures and materials, specifically?

                    Are you going to horn load your 18" driver?

     That's the only case in which you should concern yourself, as regards any K Series, EV driver.    They were designed only for horn-loaded output and a very limited, rear enclosure volume, which controls/restricts their cone motion/excursion.

           ie: Note how narrow the aperture is, in the woofer mounting baffle of the following corner horn.

                                                       
                         http://wp.volvotreter.de/projects/khorn/

       Then again, if your goal is simply seeking info and learning; too much data still isn't enough!

                                Happy listening and enjoy the journey!

rodman

I seek active discouragement, knowledge always a push/pull, experience from others here 'smartly sought'.

from the temptation of a pair of Model EV-Six's only 1hr, 20 minutes away.

https://www.ebay.com/itm/154513478054

I was thinking of building new enclosures for them that would replace my existing 'all electro-voice' speakers shown here (drivers from a 1958 Fisher President II that was my uncle's)

https://systems.audiogon.com/systems/9511

give the current ones to my Son; sell the old; or use for a while, then sell the 'new' ones.

I'm drawn to both the bigger 18" woofer (I have 15W now), but also the very rare resistor based network they use for 5 optional response curves. (Royal 400, 3 way, uses L-Pads)

Also, the Model EV-Six is 8 ohm (I understand nominal). That would let me move to a tube amp with external bias meters (my existing speakers are 16 ohm nominal, the version one Cayin A88T has 16 ohm taps, internal bias adjusters).

Or should I say, WAS drawn. I cannot find any info about re-coning those 18WS woofers, so that's that. This 18WS now seems a lightweight comparatively.

I recently installed new 16 ohm L-Pads, hard to match L to R, took me a few weeks, but the match to my room is probably better than one of the E-V Six's fixed response curves anyway. 

No, no way, but .... 

      When I had my shoppe in Central Florida; EV was one of the companies for which I did authorized warranty repair.

       It never mattered how old the drivers might be; they always had parts to repair them.

       I suppose things probably have changed, over the past 40 years, but: it wouldn't hurt to call their Support line, and inquire.  

          https://electrovoice.com/support/repair-and-exchange/

       Then too: chances are excellent the original parts in those systems, close to your home, are still fine.  

                                      Couldn't hurt to listen to them, right?  

        You mention the 18WS seeming a, "lightweight".     I never did find anything EV designed, failing to deliver everything intended.

       If you like the flexibility that L-pads offer; there's no magic to installing them (in/out/ground, as you know) and the 8 Ohm, ceramic versions are easy to find.    Piece of cake, if you wanted to convert the Sixes from their five-position, step control.

          ie:  https://www.parts-express.com/L-Pad-100W-Mono-3-8-Shaft-8-Ohm-260-262

        Sounds as though you were looking for a way out of the temptation to play further, with your system(s).    

                                                      Sorry about that!  

rodman

good thinking, my son’s suv is gassed up!

I wrote EV, let's see what they say. I also asked what currently available 18" woofer could be substituted for the 18WS.
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Have a laugh: I just instantly schemed this: mix 18" WS with my existing 15W, like adding a pair of 18" subs

new wide rolling box, like a square or round pedestal. fit’s width of the 18WS facing/firing down (avoid eventual surround sag/voice coil rub). big hole in the top

sit my existing speakers on top, 15W; mid horn with it’s L-Pad; T-350 with it’s new L-Pad.

cut matching big hole in the bottom of existing speakers, so air spaces are joined to around 11cf

low feed from existing crossover: split very low out to 8 ohm L-Pad to 18WS, add 16 ohm L-Pad for 15W, now 4 L-Pads each side (hear lewm screaming?) and the joy of getting L/R to match.

Oh yeah, I have my existing rear port I could mess with too.

Saves a lot of carpentry. All Vintage, just a Late Idea Electro-Voice never came up with.
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It needs a name, anyone?
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Put a new modern 18" in the Model EV-Six boxes, sell them with no real concern about the nearly non-existent 18WS.

did I recently say "too clever" somewhere?