Dynaudio C1 vs C2

I agree wtih Xti16. I used a REL Storm III sub when I had my C2's and they sounded good together. When I upgraded to the C4's the sub was no longer necessary and was even detrimental in my moderate size room (15' x 21' x 7'). If I were in your shoes, I'd be inclined to try the C1 with a good sub before spending the extra benjamins for the C2's. However, if your room is large enough for C4's, they are a great speaker (I highly recommend some room treatments).

So the only difference between the C1 and C2 is not imaging or sound staging but volume?

I prefer the C2 over the C1, but neither need a sub when driven with appropriate amplification. The C2 is one of my personal favorites from Dynaudio, but to be quite honest, we sell C1's 10/1 over all other Confidence models.

I own the C1's and I chose to mate with dual subs. In my room I found it easier to blend them in and smooth out the bass. I would say I only use the subs maybe 50% of the time, though.

Why do you like C2s over the C1 TTowntony?

Mostly in terms of output, they are essentially two C1's.

As others have stated, there is very little difference at low volume levels between the two. But, if you have the room, the C2's provide a fuller sound at moderate to high volume levels.