Pirastro created the Passione strings as a more stable and durable alternative to traditional gut strings. The Solo variant adds the benefit of slightly higher tension, more brightness, and considerably better projection than unwound gut strings. While they will never be as bright or loud as a steel string, such as Jargar, they make up for it in warmth. Passione strings offer the warmth of gut strings, with much of the projection of synthetic strings. The sound quality on my violin is noticeably better than with Dominants, Obligatos, or Visions. However, the benefits of incredible richness and good projection have drawbacks.
Like all gut strings, Passione Solos take much longer to set up than synthetic core strings. Where a set of Visions take 1-2 hours to set up on my violin, the Passione Solo strings took about 4-5 hours to stretch fully and settle in. This is markedly better than pure gut strings, like Chorda or Oliv, which can take days to set up properly. Another disadvantage is that the Passione Solos tend to go out of tune more quickly- especially under heavy playing in higher positions. Extended double-stop playing also tends to throw them out of tune quickly.
In summary, I'd only recommend Passione Solo strings discerning and accomplished players:
- Not for students uncomfortable tuning frequently.
- Not for performers changing temperatures or climates frequently.
- Not for players who need outstanding projection over an ensemble.
- Not for players who are uncomfortable with a shorter string lifespan and longer break-in time.
For accomplished students or professionals who can tolerate the haggles, Passione Solo strings are a worthwhile investment. They open range of dynamics more subtle than can be accomplished on synthetic or steel strings. They require a delicate touch when playing, as more weight does not equate to more sound. They're an excellent string with unlimited potential in skilled hands.