I quote a staff of Quadral:
"In the room, one can measure an acoustic output to ca.85Hz.
The actual acoustic, mechanical and electrical load is in this area for such small speakers but very low, so that even at moderate listening levels significant distortion. At higher volumes the speakers are even so heavily burdened under 150Hz that destruction is likely.
Unfortunately, it is common practice in the technical data indicate the metrological best data - customers greatly tend to obvious technical data, such as buying wattage and lower limit frequency and unfortunately there are no binding guidelines that keep all manufacturers must.
The ALUMA system but provided care setting and a crossover frequency between 150Hz and 200Hz a homogeneous and powerful system, beyond all theoretical data. I hope I could help you and find a good attitude. "
Quadral end.
The evil customers with your perverse inclinations, therefore are responsible for this technical nonsense.
Fortunately, not all manufacturers of this opinion.