Now active with external amps that is interesting.
Good point. That is how active speakers originated - I believe Westlake and ATC and others still use this approach on large models especially where severe heating from high levels of amplification can be an issue. In order to place amps inside a speaker cabinet there are definitely additional design considerations and limitations. Nothing "microphonic" like tubes, some caps and some pots could be used - the use of cheaper surface mounted components may be an issue also. Of course electronics works in airplanes, cars and countless other environments with severe vibration or heat but John is right that this will be the toughest environment. It would probably be advisable to stick with companies that have been using active designs for at least 10 years - as design limitations from a tough enviroment might not be expected to show up immediately but through extended use.