Just copied this out of the 2:100 user guide, page 2:
NOTE: BEFORE YOU MOUNT THE 2:100 IN YOUR RACK! This is an extremely aggressive and powerful amplifier intended for use with one of the above mentioned MESA preamplifiers in large venues. If after trying it you feel you may have chosen more amp than you need, you may find one of the more forgiving MESA strereo power amplifiers such as the Stereo 2:50 or the Stereo Simul-Class 2:90 more suited to your style or application. Save the packing material and keep the amplifier in perfect condition and you should be able to return it to the place of purchase for full credit toward one of the less aggressive models that might perhaps better suit your needs. If this stunning, agressive power well suits your playing style and needs, congratulations and by all means rock on.