To much bass, really


I have the Lehmann Black Cube SE II Phono Amp.
The problem is I'm getting way to much bass. I've played with the switches under the unit and to know avail.
Do I need to go inside the unit to adjust the bass?
My set ,Rega P5 , Dynavector 20x2 Low Moving Cartridge. 
Hopefully someone can help.
trip
I'm not sure why you think it's your phono.

What exactly is your set up and what's your perception?

Best,

E
I never had this kinda bass with my PS Audio GCPH. 
The bass I'm getting now is over the top
Im just trying to figure out how to adjust the bass filter on this phono.
The speaker are GoldenEar Aon 3.
The woofer just pumping away like never before, very fat sounding 

If you don't mind, trip, we're curious to know how you got it straightened out.   Thanks.