the issue with direct connections are twofold:
1.) speakers do not have sufficient bandwidth, meaning bad things happen at high and low freqeuncies. subs will beam and breakup at highs, mids will overexurt at lows. extra power is used on these freqeuncies that are detrimental.
2.) speakers don't automatically match when their useable bandwidths overlap.
for active biamplfication of a 2 way component set, well, the tweeter will have some major issues without a lowpass filter. it will receive a huge amount of power, and even though the power ratings are listed as 100W or more, well, it isn't...