The R-122 MKII can handle SPLs of up to 135db, which is really loud! At high levels, care must be taken in placement - a 45 degree angle is helpful. Also, mic pre overload becomes a possibility, due to the high output of the R-122 MKII's active circuitry (see When I use my R-122 MKII on loud sources, I hear distortion. How do I deal with it?). For extremely loud amps, we recommend using the R-121.