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Sorry to bump an older thread, but I am curious if @ace72ace has any photos with additional details on how and where he installed the crossovers? I saw you mentioned Velcro attachment and zip ties for certain aspects, but would like to know more. As you noted, there is not much space behind the panel so a proven location and mount would be great to know going into this project.
I will be keeping the OEM navigation I installed a couple of years back and adding the premium panels with the Kappa setup you recommended and likely an AudioControl LC-6.1200 amp and DSP. Still trying to decide on the 8” woofer. May use a matching ohm speaker from a home tower unit if that style is still in short supply.