LD Systems Dave 8 XS White

If you reverse the sub upside down, you receive a fat and deep bass. In the normal position the sub produces a lot of punch, but not much bass depth. It makes a very messy and aggressive bass. If you reverse it, you get a great balance of punch and depth, which gives an impression of more hi-fi sound.
The reason is in normal position the top bass vent produces the deepest bass. The bottom vent produces punch. If you reverse it, the bottom vent becomes the lowest bass, just where it supposed to be. This increases the low end noticeably and slightly reduces the punch, The result is full-bodied, balanced bass that satisfies a lot.
In the reversed mode, the system produces loud and clear sound for medium rooms. If you start to overpower it, the sound becomes lean and edgy, distorting very noticeably.
The best idea was to purchase the original bags. This becomes a super compact and very easily transportable system. The smallest you can get with a real bass.
I with the sound was a little more refined. Apparently, the power-amps are of low end and they can not produce a very hi-fi like sound.