Hi there, a while ago i have built a box around the 3015. The speaker is by far not broken in, and my amps are just not powerful enough to achieve that. The the midrange of the box is very pronounced and the lows are to weak for my needs. I am aware that i can improve things a little bit by further increasing the volume of the box a bit, maybe to 85-90 l (it is currently slightly below 80), and even maybe by tuning it to something around 60 Hz. I am a bit frustrated - even my Beta 12 in some 50 litres sounds warmer and "deeper", and two of them would be at least as loud as the 3015 - for less money. Anyway, it might be worthwile to check for alternatives. Boundary conditions: lightweight, relatively compact vented cabinet, high efficiency is a must, because my ampliefiers are relatively weak.