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Something got me to thinking about the EV Wolverine "full range" (extended range, shall we say) twincone drivers. There were (originally) three: the LS-8 (which had an AlNiCo magnet), the LS-12, and the LS-15. All three had morphologically similar three-legged cast baskets. The latter two had ceramic magnets.
At some point, the LS-12 was superceded (I suppose) by the LS-12A. The LS-12A had a four-legged cast basket (arguably a less esthetically pleasing design at that!). I know of no other difference in the 12A relative to the 12.
I have no ears-on time with an LS-12A (although, rather inexplicably, I think I have five LS-12s in the basement). My simple question -- does anyone know why EV "upgraded" the LS-12 (and only the LS-12) to the 12A?
If you don't know the answer, feel free to make one up. Extra pointes for creativity/originality!
Thanks!
all the best,
mrh
The early 3 legged ones used alnico magnets. The A's (4 legged frame)were ceramic. This is the same as the 'Michigan' line. The early 3 legged ones are alnico, the later ones went to ceramic. I have a pair of the early ones with alnico's. I dont really see any difference in the 12" Michigan vs. the 12" Wolverine. Both had the same alnico magnet, 2" VC, etc. The Wolverine had slightly different specs as to the frequency response, but what were the real differences? The Wolverine line was discontinued by the early 70's, but they still listed the Michigan series.
... the early datasheet for the LS-8/12/15 indicates that the 12 (unsuffixed) and the 15 used Indox (ceramic) magnets!?
I'm just sayin'...
all the best,
mrh
IME, of the LS and MC series drivers, only the LS-8 has an alnico magnet. The LT-12 is also ceramic. I have a 3-leg LS-12 that I am using in a console radio (restoration project) and it is ceramic.
Bob
Hummm...I have a pair of Michigan MC12's with the 3 spoke frame, and they are definately alnico. I also have a pair of the LS-8's, which are alnico. I just assumed the 3 spoke Wolverines were also alnico, since everything else is almost identical to the Michigan series.
The EV spec sheet (found at http://archives.telex.com/archives/EV/Speakers/EDS/) for the Michigan series does specify alnico for the MC-12 and MT-12. OTOH, ceramics are specified for the LS-12, LS-15 and LT-12. The MT-12 appears to use the same small ring radiator annular horn tweeter that was used in the LT-8, and not the small diffraction horn (TW-35) used in the LT-12.
I never understood the rationale for carrying both the Wolverine and Michigan lines. They appeared to be essentially the same (as you said). IME, both lines offered remarkable value and performance in their price range. The MC-8a (ceramic) is among the most neutral and least flawed 8-inch full range drivers I have encountered.
Bob
nt
all the best,
mrh
It appears that EV made the change to the 'A' designation, after making changes made in their design, making them more T/S friendly. As a result, the 'A' series drivers could be used in more home-friendly (i.e., smaller) bass reflex enclosures. See the data sheet for the MC-8A and MC-12A drivers (http://archives.telex.com/archives/EV/Speakers/EDS/MC8A%20&%20MC12A%20EDS.pdf, 2nd para. page 2):
"Electro-Voice cone speakers have now been thoroughly revised to reflect the latest knowledge of rational, optimized low-frequency speaker enclosure design."
Bob
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