Speaker binding posts with plastic covers

They DO NOT unscrew! You CANNOT use spades with these.

The crimper is for the bare end of a multi-strand wire. It ’melds’ (by crimping pressure) the individual strands into a semi-solid strand to then insert (like a banana pin) into the connector. (cut your spades off?)

there are two torx set-screws on the side of the connector. Tighten them to hold the now crimped wire end within the connector.

To remove wire: simply loosen the two set screws.

The solder is for the other end, inside the enclosure before tightening in place. You can solder the wire end after crimping it if you want to.

.....................

This $12. gizmo looks a whole lot like their $166. crimper

https://www.mscdirect.com/product/details/28718872?cid=ppc-google-&mkwid=%7Cdc&pcrid=&rd=k&product_id=28718872&gad_source=1&gclid=CjwKCAiA1MCrBhAoEiwAC2d64bb0AcvdS-hT1LOT4TEWddemjOD_s_RomLrA7dEcAjJwf2QyKXzsLRoCgzYQAvD_BwE&gclsrc=aw.ds

These 5 way binding posts unscrew (the type you and others are thinking of),

• Accepts up to 8 AWG wire, banana plugs, forks, spades, and speaker pins

they are ’mini’ size, smaller outer diameter to fit where/when nearby obstacles prevent the larger outer diameter of standard ones.

not sure, your spades might be too large for these mini sized ones.

IF your speaker cables are expensive, the connectors on the Krell could be changed

There are Spade to Banana Adapters, here's one, must be others

@rfprice

Those speaker posts look pretty much identical to the posts that came on the Parasound A21+ which I owned.  If the same, just unscrew the cap as you would most binding posts.  The only semi-difficult thing was figuring out how the spade connected, as it needs to be at a certain angle.  Once figured out, it holds the spade exceptionally well.

I doubt Krell would adopt a different, less convenient binding post, at least for US sales.

people are telling you their experiences with their connectors that do unscrew, like mine .....

the type you posted DOES NOT unscrew. read the full description

another spade to banana adapter,