& S& j8 ~; R+ U5 @the construction is of 12mm birch plywood with fillets of beech. 8 F1 A# b) N7 A' T' ialthough no diffculty was found with this construction for original design (ls3/5), it was found that, for the LS3/5A, it was necessary to specify the wood more carefully than was originally thought necessary. the use of any type of hard wood such as Parana Pine for the fillets was found to be unacceptable as a clearly audible colouration was produced by a resonance of the L.F. unit on its chassis, and these fillets had insufficient mechanical impedance to reduce it ; this matter is reported in more detail elsewhere. ”