Brightness

Hello Friends
Hope some can help?
my system is 
1. Well Tempered Classic, with Marigo cup upgrades, this is fed, to PS Audio, Gcph phono stage!!, I have it as comes with volume control, fed to my MonoBlocks, I have a PS Audio, pre/dac, pre amp, that I can connect, to play CD/s, which I have not done, in the last 5 years, or connect phono stage, to the preamp!!
I love the "Bass"", no need for a subwoofer!!
But why is the treble, is over harsh!!
I think, it may be  the pre amp??
Or is it my speakers, which are Zu Audio Souls M2, to much wizz??
I was thinking, may be to buy, a full tube "icon audio" PS2 phono stage, with volume dial, to send to my mono blocks??, but it seems to me when you go to valves, it does not go down with with deep bass , and slam??
Reason for the above, I live 3 hours drive, from a decent, audio shop!!
So I'm all alone, to make a choice??
Please Friends
Can you give me, your thoughts
Regards
David Aust