The 422Z technically is a different speaker, it was used in OEM applications, ie inside cabinets.
It was not available for sale.
So really you don't have two 418's.
The differences you mention may be more to production years, or to the 422Z being cheapened up.
I have never used 422z's. The only way to get them was take apart cabinets.
I bought new ones from Altec an built boxes, so would never have the 422.
I have seen them in passing but never bothered to look.
A call to GPA would tell you if they sound much different.
I would probably want a set of matching frames if I was going to invest in recones.





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