Despite the name, these are high-power competition speakers. The "Extra Quality" refers to component build, not power handling.
While official "full paper" documentation for this specific model can be difficult to locate due to its age, it shares its core engineering with the well-documented QL-C series: joeltimothy.co 2-Way Bass Reflex system. 1-inch (25mm) MCD titanium dome tweeter. mb quart ql 60 c extra quality
When you hold a set, the physical weight tells you everything. Each component feels substantial. Despite the name, these are high-power competition speakers