I won't go into the same level of detail as @audiothesis, but I will gladly share my experience with the Rosso line and what has consistently drawn me in across the various models. I own the Certaldo (1), but hope to be able to upgrade to the Volterra II someday.
First and foremost, for me they strike a perfect balance of being exciting while also being comfortable. Some speakers are very smooth and laid back, but seem to feel boring when you put on something more aggressive. Black Sabbath tends to be a good example. At the same time, they offer a sense of ease when the music calls for it. Acoustic single mic recordings feel engaging and spacious, without sounding like a single wall of sound. I can equally enjoy an Analog Productions pressings of Louis Armstrong followed by a mid quality stream of early Metallica. All the beauty of the classic Armstrong recording will be presented in a precise and refined manner, but I can still somehow enjoy an early Metallica album with all of it's grit and energy without being taken out of the moment being forced to focus on the poor recording quality. To offer some comparisons, nothing quite does Black Sabbath like a good set of JBLs. But the Rosso's come quite close. And some laid back speakers can create a great sense of depth to the sound of a great recording, but they make poor recordings sound flat, sharp, and sometimes unlistenable.
So that's high level. But if I had to pick one element that has always really stood out to me with Rosso it's the vocal intimacy. That's probably the one thing that constantly draws me in. That's the element that makes me stop what I'm doing and give the track my full attention.
When considering the whole line, your budget should be a big consideration, but so should the size of your room. If you have enough space for the Sienna, they are worth it. Excellent base quality, big sound, but still outstanding imaging and layering. If you're in a smaller room, I think the Volterra might be a better fit. My room is 13x15, and as much as I'd love to consider the Sienna, in reality it just might not be a good fit. If you're looking between series 1 and 2, I can say that from what I've heard the changes are well worth focusing on series 2. The top end in the series 2 are exceptional, especially in the reference and flagship series. It really brings another level of clarity and laying, without becoming overly sharp or critical.
I've heard quite a few speakers in my life. I can see why some people might have other preferences. But I'd pick the Rosso's vs competitors I've heard on almost every price point they offer in the line. Pair it with the right amp, and they are downright stunning for my taste.
First and foremost, for me they strike a perfect balance of being exciting while also being comfortable. Some speakers are very smooth and laid back, but seem to feel boring when you put on something more aggressive. Black Sabbath tends to be a good example. At the same time, they offer a sense of ease when the music calls for it. Acoustic single mic recordings feel engaging and spacious, without sounding like a single wall of sound. I can equally enjoy an Analog Productions pressings of Louis Armstrong followed by a mid quality stream of early Metallica. All the beauty of the classic Armstrong recording will be presented in a precise and refined manner, but I can still somehow enjoy an early Metallica album with all of it's grit and energy without being taken out of the moment being forced to focus on the poor recording quality. To offer some comparisons, nothing quite does Black Sabbath like a good set of JBLs. But the Rosso's come quite close. And some laid back speakers can create a great sense of depth to the sound of a great recording, but they make poor recordings sound flat, sharp, and sometimes unlistenable.
So that's high level. But if I had to pick one element that has always really stood out to me with Rosso it's the vocal intimacy. That's probably the one thing that constantly draws me in. That's the element that makes me stop what I'm doing and give the track my full attention.
When considering the whole line, your budget should be a big consideration, but so should the size of your room. If you have enough space for the Sienna, they are worth it. Excellent base quality, big sound, but still outstanding imaging and layering. If you're in a smaller room, I think the Volterra might be a better fit. My room is 13x15, and as much as I'd love to consider the Sienna, in reality it just might not be a good fit. If you're looking between series 1 and 2, I can say that from what I've heard the changes are well worth focusing on series 2. The top end in the series 2 are exceptional, especially in the reference and flagship series. It really brings another level of clarity and laying, without becoming overly sharp or critical.
I've heard quite a few speakers in my life. I can see why some people might have other preferences. But I'd pick the Rosso's vs competitors I've heard on almost every price point they offer in the line. Pair it with the right amp, and they are downright stunning for my taste.