Hi you out there! Have a question: What do you think is better? The Helix blue 62 or the Canton Pullman 2.16RS application as a front system in the polo. Or better a 20 or 26 he Pullman 3way system into the door? (or RS6 or what that means.) And what do you think of it In the self-built doorboard several of the above mentioned 2way speaker systems parallel to one? Where should the tweeters sit? Next of the bass: A 38cm Phonocar 2/765 Item number 02/765 Resonant Frequency H Z 28,5 Mech . Quality factor QMS 7,52 Electr. Quality factor QES 1,13 Total Quality factor QTS 0,98 Moved mass S MMS 169 Diameter mm D 330 Volume Liter VAS 188,49 Membrane stroke Mm Xmax —– Impedance Ohm RE 3,6 The monster is supposed to fit into the spare wheel chuck. A plate is already fitted so 12mm. Is that enough? Do you have to contain something, seal it to the edge, bass reflex or closed? How do I calculate the whole??? You see: my knowledge is not yet perfect 😉 but I am capable of development!!! 🙂 Marco!