Hello, everything is going wrong… I have a BPKiste with the following inner mass bxhxt with 19mm MDF: Closed 37,8*17*54,2 Open without the board above the woofer: 37,8*10*54,2 The board above the woofer represents the reflex tube, in space this is the only construction possibility. If the woofer had enough space on the floor with ~2cm, and above all if the woofer had enough space on the top. If it were to swing out really far, one would have between the sicke and the reflex board 2-3cm square. The r.brett is 38cm long and over covers the woofer completely. The woofer is an audio track AW1200N. The other possibility would be if the R.brett is only 12cm long, the Woofer kante does not reach, and the closed chamber would have a height of 19cm, so that of course the open chamber only 8cm Ask for quick help the thing is in construction and should be siliconed today. Mfg Gaya