I bought the premium speaker and I'm running a US 2.5 and when the blade is illuminated it has a hiss to it that doesn't sound like it should be there. It doesn't blend with the blade sound it's just some white noise in the mix. It's not really bad but for the price of the card I wasn't really expecting it.
Is this normal?

It kinda reminds me of when your TV volume is up and your DVD player is low. It's like the sound files on the card are quiet and they're being over amplified to compensate.