Need help. I have a BMW e90 (well known to look bad with the bass in the trunk). Only I have a load through. If I open the middle armrest of the rear seat, I have a relatively large opening in the trunk. Can I now just attach a free air woofer behind the load through? How should I best proceed? It would be possible to build a specially fitting bass box, where 1 or 2 reflex tubes reach through and the bass forwards. I have seen an example of a tuner where he lets the bass box into a board directly behind the load. In the load he installed a tension so that it looks good. The entire trunk was based qusai as a resonant body. The bass box itself radiated almost the sound through the load forward. I have now heard, however, that it does not work. I should rather build a bass box, where not the bass box directly through the d he opening of the through load looks forward (the sound “rays” forward, but the bass reflex tubes of the cube or similar look out at the place of the through load. What’s more?