Anybody with updates to report on this topic? I recently purchased a pair of used DNA-125 Platinum Monos and should receive them tomorrow. These were modified close to three years ago, so they predated the ARC options. Before deciding whether to send them back to SMC for any further work, I'll be comparing them against my stock DNA-500, which should prove interesting. (I also used to own a stock 125 stereo, which I compared against the 500 too, so I'm familiar with the sound of the starting point in this face-off. In that case, unsurprisingly, there was no comparison.)
