Hi, so slowly the project Car-Audio takes on me installed. I want to buy now a Hifonics ZX 6400. It costs with us in the media market only 239€, cheaper (ebay except, since I did not look) I found it also not on the net. Manyicht isser also wrong excellent, but anyway I see if / if I buy it! So: 1) Is something against this amplifier to say? 2) As Headunit I have a Sony CDX-F7750 3) Can you recommend me a good front system for Rock/Metal. 4) I want to get the The whole with double floor, does not want to lose the trunk, i.e. no alternative possible. Which membrane would be here then full (Audi A3 8l); size, watt, the woffer should run over the hifonics. Unfortunately, I don’t know the volume of the spare wheel pit, vileciht can help other A3 drivers here just one time. Maximum should Woffer and front cost no more than 300/400€! I care about the sound, pressure is not important and bad It doesn’t have to be loud!