G,
I'll try my best.
Melody Aodixun products consisted of AN211, AN300B, AN845, & P2688. The first 3 are integrated amps while the last one is Melody Premier pre-amp.
These are luxury product line from Melody.
As far as 845 based normal models, we have only the 3 monoblocks and they are M845, PM845, & MN845.
My personal impression of AN845 vs. AN211 in my own system is as follows:
AN845 retains most of AN211 finesses such as detailed, smooth, 3-dimensional, & velvet while is much more powerful in the low end than AN211.
The bottom line is I like the AN845 a lot.
Thanks,
Hugh