Hello all, Just came in here for some advice as I'm pretty clueless about the electric side of things. I've a Audi A3 (2000) and have just purchased some Hertz Energy speakers; ESK130mm 2way Components (150w) for the front and some ECX165mm Coaxial (140w) for the back. I was due to have them fitted where I bought them (they had assured me there that the fronts were able to fit) but the price was too much and I have a mate that is capable of fitting them anyway. I've heard I need some MDF collars for each speaker, where's the best place to buy these ready made? Also I'm leaving the standard head unit in and plan on getting an iphone adapter to go in the back, is the OEM unit sufficient to run the speakers I have off them, without problems? Also where can I buy the tool to remove the head unit as I haven't got any of them pokey things. Lastly, will the sub in the boot be affected by installing the new speakers or is it necessary to upgrade it? Sorry if this has been answered before but I couldn't find all the info around. Cheers, appreciate any help!