[Elecraft] K3: just how wide is it?

[DOUGLAS ZWIEBEL]

Recently, they guys at Aptos said:

[snip]
The pick-off point for the K3's buffered I.F. output -- right at the
output of the 1st mixer's post-amp stage -- was selected to give the
widest possible bandwidth. Thus there is no filtering of any kind from
here to the BNC jack on the KXV3. This creates the opportunity to do
*very* wide spectral sweeps, if required -- limited only by the
bandwidth of the K3's band-pass filters.
[snip]

OK...just how wide is the bandwidth when "limited by the K3's BP filters?

Thanks,
de Doug KR2Q