I installed the amp on Saturday, and these "subs" this morning...I used the rings, but I'm 99% sure they are not needed. Using them made re-installing the OE covers a bit of a PITA, FWIW.
Install is super simple, 2nd one took maybe 15 minutes...It takes longer to replace the OE cover and re-fasten the (4) seat bolts, than it does to install the "sub".
i really need to get the Focal mids + tweeters installed in the front door, now...as the stock HiFi speakers are really showing their weakness, at this point!
-Mark
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