Ok so then is there a way for me to quiet down the pink/white noise I hear when I turn the volume up on the amp I hear from the speakers. Now all amps will do this to some extent but my amp is beside me and my speakers are beside me at my computer desk and if I turn the volume up and not playing any audio then is there any kind of way to quiet that pink/white noise whatever that noise is it is faint when at normal use but then I connect my preamp no change in pink/white noise until I turn the volume up halfway to match a certain loudness to work with other settings and subwoofers?
OK, now we may be getting somewhere. I believe what you are describing is noise, not THD.
In particular, can you tell if the noise is coming from the tweeters?
My goal is to be able to pause my source and turn all of my gains (volume knobs) to the very highest setting, then put my ear right on the tweeter, and hear complete and total silence.
I can't always achieve that, but it is certainly my goal. If I can't achieve that, then at the very least I want to turn the volume to the max level that I will be listening, then pause the source, and have complete silence.
When you have audible noise or hiss, this tends to be a problem with the gain structure of your system. Depending on your setup, there could be some other issues at work here.
If you want help and advice, I suggest listing out your equipment, how it is connected, the cables in use, and what your specific problems and goals are. The answer may be as simple as adjusting the gain down on that amp.
This is a PC setup? How are you connected from the PC to the audio chain? At a first guess, the problem likely lies with PC or the PC connection, not likely the amp.
EDIT: I see that amp has a sensitivity switch on the back. What setting do you use? Have you tried the other setting?