Condenser Mic - Constant white noise (hiss), can't get rid of it

I’ve been reading through the posts and learning a lot. Thank you all for sharing and helping!

I’m new to recording and I just set up my recording system to do voice overs and audio books.
Here is the setup I’m working with:

• Microphone: MXL 770 Cardioid Condenser Microphone

• Channel Strip: DBX 286s Microphone Pre-amp Processor

• USB Interface: Focusrite 2i2

• Software: Adobe Audition CC

• PC: i7-2670QM 2.20GHz, 8gb Ram, Win10Pro X64

My problem is I’m getting a constant (white noise) hissing in my headphones and comes through on my recordings.
You can hear this hiss as soon as you turn up the gain instantly at the very lowest gain levels.

I’ve unplugged the laptop to run only on battery, but the hissing persists. (I read this tip on another post) I have also taken the channel strip out of the equation, connected the mic directly to the interface and the hiss is still there.

I also uninstalled the interface drivers, and re-installed. I was seeing online somewhere that the 2i2 had horrible drivers for win10.

Here’s a sample I recorded of the hiss, you’ll also notice that it changes pitches at times.

Any suggestions?
Thank you for your time