> (...) they're all particle board and, yes, bad quality. That's not true. The Billy line is a mix of particleboard and a MDF backboard/diaphragm, but the Kala

> (...) they're all particle board and, yes, bad quality. That's not true. The Billy line is a mix of particleboard and a MDF backboard/diaphragm, but the Kalax/Lack lines are composite panels built from fiberboard, plywood, and a cardboard cell core. And they are superb, specially given their price and also weight.