Thanks for all the comments.
Yes, I'm wanting to change to active speakers.
My McIntosh MCD600 CDP has a lovely preamp section that will go out straight to the speakers.
What the 803s do really well is imaging and soundstaging.
Glad to hear the 40s also do that well.
What the 803s do a little much of is the treble.
Glad to hear the 40s have a sweeter treble.
The 803s are a little light in the bass.
Glad to hear the 40s are warmer.
Again, thanks for all the helpful information.
Any and all further information is much appreciated.