That Behringer headphone amp is long discontinued. I'm surprised that any still work. That entire series was way too noisy for my taste as were my other Behringer PowerPlay 'phone amps. Good riddance.
Not sure who mentioned Behringer that you are replying to.
One thing I noticed with the Powerplay headphone amps was the closer you got to the Power button, the noisier the outputs got.
The first 2-3 outs from the far side were fine, but the last couple near the power can get pretty noisy, and gradually so in between. (they had 8 outs)
My experience anyway.