I'm not shure if I have a problem here, but I've made a pair of MJK's MLTL with Lowther DX3
And I whonder what the effect of packing the stuffing too compact would be in this construction?
Are there typical results if you do this mistake?
Primarily you'll find it starts to attenuate more of the midbass than is ideal & increasingly, the bass, so LF output will start to be reduced. Subjectively, there's a risk of the dreaded 'shut-in' effect too, where the sound appears somewhat constrained.
I have a dipp arround 50 - 90 Hz (quite steep-15dB) and was whondering if it might be the problem.
The other thing I was thinking might be the reason, is the room and it's acoustics.
But that would belong another place on this forum
I guess the stuffing is not the problem after all then.
The room would be my guess. If possible, try moving the speakers around a bit & taking some rough measurements (doesn't matter if you can't keep them in the new position, but it'll help establish if it's a room or speaker related issue.