I have not used Obligato strings in about ten years and thought I would give them a try on my new viola, which tends to have a very bright and projecting sound but usually needs a little help in the lower range. I had hoped this would add some warmth and resonance to the C and G strings but instead has only worsened the sound. The strings sound very fuzzy and not concentrated. I'm not hearing any core or dimension, especially on the C string. They're also rather slow to respond. The Jargar A is fine but nothing exciting. I am sure my viola's tendencies do not help, but these strings just do not work for me.