The MM is not a drop-in sub for an 81. Thats the C-pig. The MM was made to capture the vibe of Zakk Wylde with Ozzy. That was EMGs, but it wasnt the flamethrower tone that EMGs are normally used for (or that the black dhalia have - I dont know about the other guys). The MM is more scooped, less compressed, less powerfull and has both more lows and more highs, with a higher resonant peak. The C-Pig is closer. So is the PK (cos of the 81s high-mids).
All 3 pickups have much more low end than the 81.
All of them handle detuning very well.
Compared to an 81, what sort of eqing to you want? If an 81 is 5/5/5 (B/M/T) then what are you after here?
Will you be OK with a drop in output? (I'd say the MM is about 20% less powerfull than an 81, a PK 15% less and a C-Pig a tiny shade more powerfull).
i had the emg 81 in the same guitar (and a lot other high output pups)
and didn't notice perceptible difference in output
it has a huge output, just don't have that in-your-face active (artificial) tone
and i wouldn't say it's more scooped
it has the same amount of mids of a duncan custom (sh-5), for example, and it definitely has more low mids than the emg 81
the thing is that the miracle man seems to boost the stronger frequency of each guitar and strings
so in bright guitars, it will probably make it sound brighter
in my two les pauls it sounded VERY dark on the low strings (darker and bassier than the holy diver, than the 81 and most pickups i had) and very bright on the first strings (like a bill lawrence with more attack)
the painkiller and the pig sound nothing like an EMG, imo
i'd compare the painkiller with a gibson 500t or duncan distortion, but definitely tighter, more middy and totally clear, unlike these pickups, that have a huge amount of mud
i think this is a matter of taste, but if he wanted a 81 replacement, the miracle is definitely the closest
i tuned the lowest string to A this week (just for test) and it retained all the tightness
i like the throaty low mid sound the miracle man gets in very low tunings, specially with peavey distortion
but the painkiller works great for that too
anyway, i'm getting my holy diver back today and saying goodbye to the miracle man (which i love too)
think i'll order a cold sweat set for my other guitar