Quote Originally Posted by Sealed
Mine are of 1985-85 vintage and I am experiancing no such problem. It could be your choice of electronics or cabling.

My friend has some 103/3's and those are very similar: smooth, flat and even.

KEF measurments (KEF and independant) measure the 104/2 absolutely ruler flat from 55hz to 22khz, +/- 2 db. Nothing is recessed at all.
I have tried several electronics, cables..always same result. In room measurement shows this region is slightly laid back. Mine are 1989 vintage.
Others 104/2 are showing same behaviour.