I found out why UAD drivers not sounding properly for me. I am using DFX along with audio driver from long time. For HDA FF00 driver, DFX automatically hooks to output sound and bass was coming great but when I install UAD driver, DFX stops working. So I need to re-install DFX again to make it work on new UAD driver. Latest PAL driver 6.0.9403.1 is working as good as HDA FF00 now.