I should have been clearer in my post: my intention was to say that not having the mod done would give him greater flexibility in regards to recording sources that are both high and lower volume. I've recorded almost nothing
but loud rock shows with my SP-CMC-2 and haven't had any issues using a battery box (into a R-09). The few times I've used them to record softer acoustic sources, my ears have perceived greater detail with them as opposed to a set of 4.7k modded mics that I also use so I'm opining from my experience. I suppose the standard "YMMV" might apply. Odd that when you used AT853's with different recorders you got different results; one of those audio mysteries.