The Thiels hit harder form top to bottom with better leading edge impact. The bass has a lot more punch than the Dynaudios (never heard a Merlin). Snare drums seem to have more snap on the Thiels. At the end of the day the C1 and 2.4 will not be that different as they are both pretty flat and well made. Your room and setup will matter more.
The thiel will need a warm front end to sound there best. There highs are not harsh but they do shelve up about 2 db after about 8khz in most rooms.
The Dynaudio's have a sweeter treble but as a whole I like the Thiels better. I bought a pair of Thiel 2.4 and I no longer think about my system... and I post a lot less too... I just enjoy the music these days. They were a good but cheaper than my pervious speakers too. I think the only Dynaudio I would trade up to would be the C4.
The thiel will need a warm front end to sound there best. There highs are not harsh but they do shelve up about 2 db after about 8khz in most rooms.
The Dynaudio's have a sweeter treble but as a whole I like the Thiels better. I bought a pair of Thiel 2.4 and I no longer think about my system... and I post a lot less too... I just enjoy the music these days. They were a good but cheaper than my pervious speakers too. I think the only Dynaudio I would trade up to would be the C4.