Please, somebody who has done this on a U13 Attesa explain to me wtf to do. I'm at the point where I feel like selling the sub+amp and forgetting it all.
I fail to see how anyone could even consider getting a power cable through the main loom grommet. Inside the car it's behind some big arse black box thing that I can only assume is somehow related to the aircon/heater, and undoing all the screws it wont come out anyway. I can get a single finger feeling the grommet, I think, and by doing that cannot get my head anywhere near there to see what I'm doing. Pushing anything through would just catch wires.
In the engine bay I can see, get a couple of fingers to, but don't see how you could get any kind of blade near it with confidence to make the hole somehow appropriate (the grommet extends alone the loom so you can't just squeeze something else in.
The only other grommet I can see is right behind the strut tower on that same side. From the engine bay I can clearly see it, but that's it, can't get more than a finger there. Inside the car I can't even see where it is.