At first glance, the JBL S38 looks old-fashioned, with its side-by-side midrange unit and woofer. But then you notice the metal-finish cones and the tight vertical array of the midrange unit and the tweeter, and it becomes possible, to echo Bob Reina's phraseology, that this isn't your father's JBL. One area, however, where the S38 is definitely a JBL is its high sensitivity: an estimated 91dB(B)/2.83V/m.
In addition, while the speaker's impedance magnitude drops to around 4.1 ohms in the lower mids and the high treble (fig.1), it is generally an easy load…