New splits...
New Amp...
New Sub...
Fibreglass box
VOILA!
Sounds SO MUCH better!
The biggest mistake was to disconnect the underseat subwoofers, I will upgrade and reinstall them tomorrow. Aside from that, everything else is perfect. A great little upgrade!
I had a standard hifi system. In the original photo, you can see splits for the door, but I decided I didn't want to customise a panel for the tweeter, so I opted for an all in one.