Hello, look, this is the message i've post to apogee support and i want your opinion :

Hello,
Excuse my english cause i'm french!So please : can you answer with simple words or tell me if there is a french support...thanks!
My problem is :
I have got the classical apogee rosettaAD with one stereo channel.
Yesterday, i buy the new rosetta200 with two channels. I just want to know if the rosetta200 converters normally are the same that my old rosetta AD. I mean : "there is a difference of quality?!". Because it appears to me that the rosetta AD have a best quality than the rosetta200. In rosetta200(who is less expensive than rosettaAD), i notice a lower definition of the bass frequences and medium frequences than on rosetta AD. IS this normal?
Cordially, jean-pierre
Thank you, i wait for your response.

The clock is important, what is your clock master, internal?
can you give us manufacturers specifications for jitter, dynamic range, THD? subjective tests are difficult.
Is your ad the se version?