Glad to hear it was a worthwhile upgrade! I test drove an ID.3 on the weekend and I definitely think I'd need to upgrade the speakers like you.Hi there! It's Whitton Car Audio, the guy is very good.
I've just had my JL C3 6.5in tweeters and front speaker upgrade done, £460 total for front inc. labour.
The difference is INSANE, I honestly don't think I'm going to need rear speakers now the front is so crisp.
He also checked the rear audio channel on the stock unit - dead as a dodo. Clearly needs turning on via infotainment, though VW don't seem to think so.
I have a contact at a VW dealership who found a 3rd party company that know how to sort it out in the infotainment system to enable it, I think they quoted about £490+VAT to install and activate the rear speakers?
Were the JL C3s the only ones offered to you, or did Whitton inform you that they were the best choice? I've always been a Focal man and I know they make speakers that work in the ID.4.
Did you have anything else done at the same time for £460 such as add sound deadening material to the doors?