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A couple of answers best I can -


“the older 4594 (non HE). Its the same dimensions though as the HE” yes except the phase plug on the HE extends out of the throat of the driver by about 20 mm.


Which is the best driver … short answer is I don’t know. From what I have read they all perform very well. As a general rule any of the new drivers from these manufactures are excellent. All of these have been using FEA and Kippel measurements to improve their designs, and the results have been excellent.


https://audioxpress.com/article/Test-Bench-B-C-Speakers-12NDL88-12-Woofer


FWIW This is a test looking for the best 10” driver; I suspect its representative of these manufactures 12” drivers of the same series. https://www.diyaudio.com/forums/multi-way/324260-war-10-monster-midbasses.html


Al is usually correct with his comments … https://usspeaker.com/ciare 12ndh4-1.htm