Hello all! Swapping my BMW 316i for the 1.8 T Sport A3 this week. I've read up lots of information on upgrading the sound system on the A3. I believe it has the Bose "upgrade" fitted - I know it has a subwoofer in the boot but am not 100% certain on whether or not is the full Bose system or not. Anyway, irrelevant as if it is Bose or not, I want to ditch it. I have read about the different products Andy Mac offers, one of them being a replacement subwoofer and the MDF speaker adapters. I am comfortable with splicing and soldering - so I could resort to throwing away any EQ or amps which are currently in the car, and just re-purpose the existing wiring between the head unit, amp and the speakers. In my BMW, I did something similar to this using an old Sony amplifier which had a adjustable crossover built in which powered Focal access speakers in the doors and a normal subwoofer which took up most of the boot. Any tips or products you can recommend or are actually required - please post them here. I already have the head unit, it is a Sony MEX-BT3800 which has 6 4V pre outputs and bluetooth - it's perfect for me so there is no point in me changing it. Thanks all.