Help in minimizing hiss

You should work with a reputable dealer and request low-noise and low microphonic matched tubes. The quality and noise level of a 6SN7 can vary greatly, but the right tube will provide wonderful sonics in a preamp.

I mentioned a power conditioner for your sources since noise from the AC line will also be audible thru your speakers. This is not hiss, but every line connected to the power grid will introduce noise into the system (even a dedicated line). 

@erik_squires  I do have absorptive panels covering much of the wall behind the speakers and a 2'X4' treatment on sidewalls at first reflection points. Room is 18'X 34' with 19' ceilings.
@jsautter I'm only rolling tubes to replace the JJs that came with the Freya.
@lowrider57  Tube Depot set me up with low microphonic, matched etc GE 6SN7 GTAs. Should be here in a few days.

Turned on the Pass amps first and there was almost no audible noise with my ear on the tweets
Then I turned on the Wavelet and the hiss came back but not full volume
Then the Freya in full tube mode and the hiss got a bit louder but not much
Approximation:The Pass amps are less than 10% of the hissThe Wavelet is about 60% of itThe Freya (surprisingly) is only about 30% of the hiss
Thanks again for all the help guys, it's greatly appreciated.I can live with a bit of hiss that is inaudible from 3' + but just want to be sure I'm doing all I can to keep the signal path clean/clear.Scott

Let us know how the tubes help, but my fear is that these old stock GEs will increase the noise and you may find new noises which didnt exist before. Hope I am wrong.

@jsautter  Again I don't expect the tubes to quiet things down. I am rolling them for improved sonics.
I'm not sure there's much I can do to quiet down the Wavelet which seems to be making the lions share of the hiss.