Tannoy Reveal 502

Let me spare you some time on checking numerous fora etc. YES - they sound excellent. YES - there is a persistent amp noise when speakers are turned on and there is nothing you can do about it. I found this information from Tannoy customer support:

"I can't say for certain if there is a way to reduce the amp noise on the speaker, nor if this is considered an issue at this point. I can also here a bit of noise from the speaker when I turn it on, but I need to be close to the speaker to here it. I cant say we have found this to be an issue at this point. There isn't much more I can offer with the speaker at this point besides returning them to guitar center if you are not satisfied with them."

I would love to keep them because honestly, they sound amazing. But if you keep your monitors on most of the day and you're in a small room, the hiss will annoy you. My other active monitors (Presonus Eris) may sound much worse (and seriously, compared to Tannoy they do sound crappy), but there's no hiss problem.