The Auratone 5C are a small set of passive studio monitors. I love how small and portable they are, and deliver a good sound for such a small set of speakers. However, because of their small size, they aren't best for mixing, but are suited best for A/Bing mixes. Since they are passive monitors, they need to be powered by an external power amplifier. The studio I use these at has them pre set up and I'm not sure what kind of power amplifier that they run it with, but I believe most power amplifiers will run these okay.
While the sound quality of these won't cover all of frequency spectrum, they produce a good, listenable sound, that is good for getting a new perspective on mixes, or simply just for monitoring and listening on. These don't have enough of a low end to make them really a viable option for mixing. The sound quality is clear and is precise for the frequency range that they do cover. The dynamics are tight and overall they have a good punch to them.
I've been using the Auratones 5C studio monitors for about a year and have found them to be a great set of monitors when it comes to A/Bing mixes to get a new perspective on how your mixes will sound on another set of speakers. The price of these is quite reasonable, and I love how easy these are to move from place to place in your room or outside of it. I don't know too many sets of studio monitors that are this small and pack as much punch as the 5Cs. I love having these around to check mixes on, and would absolutely recommend them to those looking for a great set of monitors to compliment their main mixing monitors.
The frequency response of these speakers is of extreme flatness. For several years I have it and I now eyeing the chance to use them as the main system. Moreover, given that Bruce Swedien, the mixer Michael Jackson could not do without it, it's worth breaking the bank.
Obviously, you can always check the mix on a good pair of Génélec affordable (like 1035). Personally, I find myself so not to make use of 1035 as Speaker of that order.