Don't forget that it's a DSP amp tuned for the T6 or T6.1
You're probably not going to get the best out of the speakers without the amp installed.
I've got a 2019 T6 Caravelle Exec (I know, not a Cali) I installed them in yesterday and there's an improvement over the originals even though mine actually comes with larger drivers form the factory.
Because I have a T6 I had the choice of the larger alpines, but was advised by them to go for the smaller one (like the T6.1 ones) if I was installing the amp and sub so I'd get better midrange.
Amp and Sub arriving tomorrow.
My ears are no stranger to HiFi, my home system is Bryston & PMC so I know exactly what particular tracks should should like...
So far I'd say the soundstage has massively improved and it's put the sound higher up where it should be. Even with the smaller driver I've not lost any bass and have gained a lot of detail.
Hopefully the amp and sub will fill what's missing below 50Hz
I did add 2mm silent coat to the inner door panel, some on the outer skin and some of their foam (part of the starter kit for £17.99 on Amazon, one for each door)
Surprised that although everywhere else on a Caravelle (assuming the same on a Cali) has extra sound insulation over a Transporter or a Kombi, the doors only have some extra wadding on the door card. It was very quiet before, but it's even quieter now with more of an AUDI clunk to the door that a Golf clunk..