I have used Behringer mixers since the late 90s. One of the first mixers I bought from them came with a sample CD. On that CD, Uli Behringer recorded a little intro where he introduced himself AND pronounced the company name using the hard ‘g’ sound, not the ‘j’ sound that most people use. Ironically, I was just on their own website and a guy introduced Uli as Uli BehrinJUR, LOL! I guess he gave up years ago trying to correct folks (the CD was made in 1999). As proof, here is the intro speech by Uli Behringer:

And here is the video I found on their website with the “jur” pronunciation:

So I guess it depends on who you ask. I’d give more credence to the pronunciation by dude for which the company was named.