Go Active Crossover or Upgrade existing XOs?

Digital cross-overs are unlimited, though stock cross-overs and firmware only touch on what is possible with advanced signal processing which can do things that no analog cross-over, active or passive could ever do, especially integrated in design with a purpose built amplifier.

Surely they have no side-affects?

With a digital input, only the side effects you intend, which any speaker is going to greatly swamp.

atdavid

With a digital input, only the side effects you intend, which any speaker is going to greatly swamp

There is no crossover that is perfect, not even an active digital crossover. Although speaker systems almost always have distortion many, many times greater than a quality audio component, that does not mean that the speaker system will not reveal faults in those components. What you wrote is a bit ambiguous, so perhaps that’s not what you intended to say.

With a digital input, only the side effects you intend, which any speaker is going to greatly swamp.

Hey, can I go with "DSP" and live happily ever after?  

I think you would have to trade in your audiophile badge