I use mostly my Thorens TD147 turntable ( and a choice of 3 different phono stages) and a Marantz CD72 SE CD player as the source for my Crack (with a Sennheiser HD600).
Sounds perfect ;D
Tidal HIFI from high end laptop through Topping DAC. Dual 510 turntable through Cambridge Audio phono pre. Actually just had my first good listen last night after installing the Speedball. Both sources sounded amazing. Even my poor old hummy Dual never sounded so good.