Even though this thread is over a year old I'll throw in my 2 cents. I upgraded my original C1's for the C1 Signature. The MKII/Sig sounds much cleaner at lower listening levels where the originals sounded best when turned up past 85db. A little louder than I normally like. But that being said the originals will play a little louder when you crank them way up.
3 weeks ago I traded in my C1 Sig's which I never thought I would do. I find the Raidho D1's much better than the Dyn C1's but are they expensive. 3.25 times more than the C1 sigs. The D1's have even smoother highs with the ribbon tweeter and the mids are even clearer (much blacker background). Imaging is a lot better. That being said the Dyn C1's are easier to set up where the D1's really need to spread apart a lot more and toed in a lot more. Also the Dyn C1's go a lot lower in the bass but I do have a sub and I'm pretty close to having set up to work with the D1's. I had the sub crossed over at 36hz with the C1's and have it set at 46hz for the D1's.
3 weeks ago I traded in my C1 Sig's which I never thought I would do. I find the Raidho D1's much better than the Dyn C1's but are they expensive. 3.25 times more than the C1 sigs. The D1's have even smoother highs with the ribbon tweeter and the mids are even clearer (much blacker background). Imaging is a lot better. That being said the Dyn C1's are easier to set up where the D1's really need to spread apart a lot more and toed in a lot more. Also the Dyn C1's go a lot lower in the bass but I do have a sub and I'm pretty close to having set up to work with the D1's. I had the sub crossed over at 36hz with the C1's and have it set at 46hz for the D1's.