Hi, I installed a Hertz HX300D in a closed housing. But I’m so dissatisfied with the fact that I put in a bandpass box (Stealth 99 Euro) from a buddy. I want to try it out in a bass reflex box. My problem is that the liters are just too little to put the port up next to the woofer. The port should definitely lie above because I want to put it in the spare wheel dump. WinISD comes on 26L with a 30cm long tube. The top plate s should be at least 42×34 and in the depth I need then also min. 30cm. Can someone calculate me a volume where I can get there reasonably. Dmm 250 Xmax 10 Re 1,6 Fs 37,0 Vas 35,10 Mms 179,9 Cms 0,10 BL 12,60 Qts 0,37 Qes 0,40 Qms 4,97 Spl 97 Should already play clean and also generate a bit of pressure.