by Bob » 08 Sep 2011, 17:35
I have mostly used D'Addario EJ45Cs in recent years and haven't tried EJ25B's, but will be interested in knowing how you like them, because only have a set or two of J45C's left and am about to reorder a ten-pack.
Even though I have mostly used EJ45C's, my Tsiorba blanca came with Luthier Concert Gold Set 40 Medium-High Tension basses and LaBella 2001 Classical Hard Tension trebles. I was surprised how much I liked that combination, but haven't tried it on any of my other guitars. Peter sent me a different mixed-set of high-tension strings several months later that I also liked, but I don't recall now what they were and I only tried them on my Tsiorba.
I find string comparisons difficult for several reasons. Any brand of new strings sound better than old, worn-out strings and it is difficult to remember what a previous set sounded like when they were new. Strings also sound different on different guitars which makes comparing new sets of different strings on different guitars problematic. They also feel different on different guitars due to guitar-top stiffness, fret-height, and string-height differences.
Another big issue, at least for those of us who don't play professionally, is string life. We all have better things to do than change strings, but string-life comparisons also can be misleading. Some sets of EJ45C's, for example, last a very long time, but others don't. I have had the same sets on my Contreras and Ramirez flamenco guitars for months. They are badly worn at the frets, but none of the strings have broken and they still sound surprisingly good on both guitars. In contrast, the last two sets on my Tsiorba deteriorated rapidly. That alone could suggest that something is wrong with the Tsiorba, such as a sharp edge somewhere. However, the reverse also has been true where other sets of EJ45C's have lasted very long times on the Tsiorba, but have rapidly deteriorated on the other guitars. Differences like that can make single-trial-results misleading.
-Bob