While the term "audiophile grade" means a lot to people who know little in the end it means nothing. Marketing is marketing and it suits us to remember that in this snake oil filed hobby. The
A500 tests incredibly well especially at its price point and above it. Not only that, but Behringer amps are
incredibly well built. The real question between the two is do you want all the extra space taken up and do you need the extra head room - nothing else. They will both have amazing sound quality end of story.
Also, realize I am not saying anything bad about Emotiva amps they also test very well and I will likley be using 2x LPA-1s to power my active set up when I have completed the build.