moin, a friend of mine drives an ej1 (civic coupe) and wants to polish up his, with permission, grotesque sound a little bit.There is a sony-HU (asks me which one exactly, I have to ask.estimate ma 100-140€ class). EDIT: sony cdx – gt 200s got him convinced to dam in front.So that’s taken care of. at the moment there are 16s mbQuart installed in front, but they sound very bad about “kaputt” or something. I have to take a picture… for the front we have now got a helix blue 62 mk2 for little money, and that is also the main point, WENIG money, but no scrap! reasonable beginner class is completely sufficient. a sub should be dispensed with first, for that also music should be present at the back (is a must). so only the standard recordings remain in the tray, should be thinning 16s, possibly also a bit bigger. bass should therefore, as far as possible, also o so, the whole fun is to heat a 4-channel, preferably used.price up to 100€. and now you are there… mfg