Hi so I would like to build the heart hx380 into the spare wheel chuck. there are a lot of housing details. at closed is one with 23 liters and one with 38 liters. also there are BR boxes with 33 and 48 liters (both with a fb of 30 hz). since I want to take full advantage of the spare wheel tube, the diameter outside should be 55 cm. since the sub should be a installation depth of 17 cm and under the sub 5 cm space (I think because of the ventilation), the box has thus (at 2 cm wall thickness) 45 liters. by the thorn of spare wheel are lost again a good 1 liters (since I build a mini-box and screw the box in it) and the sub displaces another 3 liters 1. question: would it be bad if the box has 6 liters more? after the frequency channels a larger volume has a reduction of the maximum level but to follow an increase of the lower frequencies. or does it roar at some point and I should build a kind of cube pure the 6 liters volume takes away? 2. ask: since the “dorn” is in the middle, I have a bit of space again under the sub. if I put the sub further back (so in the box) so that the pole core bore (or as it is called ^^) has 5 cm space down again, is that enough then? besides, I want to keep the possibility open to make a br box out of it. this is even very likely. 3. ask: since the one box is smaller and the other one is bigger, it would have to be one in between possible and with d in parameters can be calculated (i.e. the length of the tube), right? 4. ask: would it be possible for me to lead the br-tube up outside the box (so the one end of course looks into the box a small piece in), and then let the opening up from the double floor look out? if you could answer these questions I would be very grateful to you, and nothing would stand in the way of the expansion.