You can't play sacd on a standard cd player. You need to get a sacd player or a universal player that can play sacd.
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The CD layer on a hybrid sacd (cd and sacd) purportedly benefits from the DSD process and sounds better than a standard cd version. Can't say I've done a direct comparison but Sony/Philips claim it is true.
As to whether this helps your issue with lean low end, well, that's another story. "Sounds better" might not necessarily mean fuller low end. Perhaps you need to let the Krell break in a bit.
I agree with Pawlowski6132. Many of the SACDs that I have of older works have been remastered and this seems to help the cd layer as well. Of course, they probably also remastered the redbook only version. So, I might look for new remastered cds of your old thin sounding favorite cds and try a few. I'm not sure that there is much point in buying hybrid SACDs if you are not giong to use the SACD medium.
A DSD remaster such as 'Let it Bleed', originally released on SACD, is available as redbook only CD and sounds much better than earlier issues. It's no match for the actual sacd in air, etc but very good in bass weight and texture.
The krell 400xi is extremely neutral and extended. If you want to fill out the bottom a bit on older recordings, I recommend leaving the krell and speakers alone (keep that bandwidth!), and consider upgrading to a better (possibly tubed) digital source, especially one with user selectable treble filters. Choosing one with a steep slope roll-off may enable you to goose the volume on the 400xi when listening to the leaner recordings in order to fill out the bottom without becoming to bright in the process.