The aluminum shorting ring doesn't move at all it's burried under the gap. SFG magnet shorting ring not Dual Differential Drive, it works but helping to stabilize and make the flux equal on both sides of the gap top and bottom.
Rob
The aluminum shorting ring doesn't move at all it's burried under the gap. SFG magnet shorting ring not Dual Differential Drive, it works but helping to stabilize and make the flux equal on both sides of the gap top and bottom.
Rob
"I could be arguing in my spare time"
Interesting reading about the influence of the "short ring"
http://diy-audio.narod.ru/litr/Farad...lImpedance.pdf
That's the construction on newer drivers, not the 2245. How could there be rubbing marks on the aluminum ring on my old 2245 if it did not move with the voice coil? Believe me, it moves. Maybe it's incorrect to call it a shorting ring but I don't know what else to call it.
It doesn't matter. The aluminum flux ring is in the same location. Have a read of the attached linkThat's the construction on newer drivers, not the 2245.
http://www.audioheritage.org/vbullet...ume-1-Number-9
Without the outer foam ring the whole cone tilts and rubs. The rub marks could easilly be from the former rubbing against the top plate and pole piece. The aluminum you can see is part of the VC form not the stabilization ring. The voice coil form obviously moves.How could there be rubbing marks on the aluminum ring on my old 2245 if it did not move with the voice coil?
Rob
"I could be arguing in my spare time"
That's where the misunderstanding comes from, the part that has the rubbing marks is not the shorting ring, it's the voice coil former, so of course it moves
The shorting ring is deep into the magnet structure and is fixed, coincidentally your VC former is also made of aluminum, that's the confusion
My avatar: 4520 loaded with 2225H on E140 frames,
1x 2202H on custom front loaded horn, 2x 2426 on 2370.
As seen from E120 technical data
http://www.audioheritage.org/vbullet...l=1#post148781
there is seems some kind of aluminum foil in the former, I expect mainly to reduce coil inductivity (Le) that would become of importance on higher frequency (over 1kHz), but concerning that 2245 is LF driver, such aluminum former had mechanical and electrical "purpose",
but on the figure of 2245 cone kit aluminum foil is not visible
Revisiting an old thread...
In the past few months, the response of the 2245H's in my 4345's (stock) seem to have improved subtly, yet wonderfully. I've not changed a thing in my system for a number of years; and, I'm not a heavy user, being as I'm frequently out on tour. So, maybe this "extended break-in" is just that. Whatever it is, their tonality is ever-more remarkable.
We had dinner guests last night, and after all the social folderol, we got down to some serious listening. My neighbors had never heard such things as what the 2245H's produce - they left carrying their jaws. And, it was at maybe 75dB.
Just sayin'...
bo
"Indeed, not!!"
I am afraid that "refoamimg 2245" would become soon, so be care not to destroy inner parts. I have almost the same experience with my 2231A drivers. Unfortunately there are no original refoam-kit for either 2245 or 2231 drivers. Most of the AF refoams do not sound as previous originals. Another problem: even the recon-kits do not sounds as originals....
From what I had in the past: two 12 inches that I did buy (cheap) but I hat to recone them (myself) with original parts from JBL. They had a Mass Ring, JBL did that for their studio woofers so the mass ring reduces efficiency a lot but makes the woofer going much lower than let's say a K-120 (guitar speaker). That mass ring was glued to the inner side of the voice coil, near the dustcap.
Hope that it gives you some light
I know that it is considered blasphemy here to consider such things but ...
Since JBL is no longer offering kits to rebuild the 2245H driver, does anyone here have first hand experience with the McKenzie kits? Assuming that a JBL kit is not available who is the preferred fallback vendor?
http://reconekits.com/jbl2245h8ohmreconekit.aspx
_____________
Best Regards,
Carl Huff
Is that, in fact, true? C8R2245H seems to -not- be NLA ($276 as of April 26)JBL is no longer offering kits to rebuild the 2245H
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