Our old LL1545A is an excellent sounding line input transformer used in both pro audio and audiophile applications.
However, for most users the LL1545A is more flexible than needed and the number of pins is too many and they sit too tight. In the LL1545E we have kept the audio characteristics of the LL1545A but reduced the pin count significantly. In addition,
the LL1545E primary windings are structured so that the transformer can be connected simultaneously for 1:1 for balanced
input and 1:2 for unbalanced input, as indicated in the LL1545E data sheet.