Sony XA5400ES lack of bass when new?

Using stock cord?

I too purchased one a few months back. I've owned a lot of players and I enjoy this one as much as any I have ever had.
(various Sony's including an SCD-1, Meridian 508-24 and G08,
Ayre, Cambridge 840c)I wanted a player for both formats and I have not been disappointed at all.
To your point, I have not found the player to be bass shy at all. Just the opposite. It has very deep and powerful bass when called for. It does this with extremely good definition and delivers what is on the disc. The player has excellent drive and a wonderful overall smoothness. I just can't complain honestly.

"Nothing" below 100hz was an exaggeration but meant insufficient.
The bass is better after 24 hours but will check my connnections.
Otherwise I had a SCD-1 for 9 years & the 5400 is tighter + more musical.
Like a window into the recording session

Like many others here, I have found the Sony 5400es to have appropriate levels of deep bass right out of the box. However, its bass definition is not as good as that of my Cary Xciter DAC (using the Sony as a transport via a 0.5 meter coax cable). I suppose my Sony is still in its break-in period (thanks, Metalla and Bigtee, for hope that the Sony's bass definition will improve). But it's an excellent RBCD and SACD player overall, and a bargain.