First, you have to establish whether it's vinyl or wood. So a torch is a good way to do that, eh? Another way is to place termites on it and see if they eat their way through it. Or maybe a mass spectrometer? Whadya think, Socketman? What should Phil do to establish the composition of his speakers?

House of the Rising Sone
Out in the mid or far field
Dedicated mid-woofers are over-rated