What can I do to check my Master?

If you just mastered a track and want to compare it with the original, you can analyze the master again. You can check your Master against any Reference. You can see in the EQpreset what EQ differences there are and you can also make a new Reference while you are mastering your track. Right after the Equalization and Multi-Band Compression processing is applied on you Mix, save the results. When you analyze and compare this to your Master you can see the differences in EQ. For instance when I was using Izotope Ozone's Loudness Maximiser, there was a distinct peak at 160Hz +4/+6db when I was boosting the Master. For other processing like Reverb or Delay (if you use them while Mastering your track) it's best to make a comparison like this. You must load the Master as Source and compare it to a Reference of choice. Then you can see in the EQ-preset Tab of AAMS what differences there are in EQ. As a final last mastering step you could correct using the EQ-Preset and Equalize your Master again, then normalize this to 0db and this would be your Final Master. The final sound is what is important and correcting the EQ of your Master is usually more important than loudness. Comparing is a good thing to do and is the main function of AAMS. But remember to be aware of what Source and Reference you are comparing. When you swap source and reference, you might decide on the wrong EQ settings and your Master will sound worse. You have to understand what you are doing, play around with it and learn for it. Then you can decide that comparing your Master is a good idea and you can add it to your mastering routine. In particular, if you are using other plugins or outboard equipment like Delay, Reverb or anything that can change the EQ Frequency Spectrum of your Master, comparing and correcting is a very good thing to do.