Vladimir said:I mentioned the Crown amps not because I like to push the brand, QSC or other is as good or better. The main advantage is in the integrated active crossover. You can set each amplifier at certain frequency range and slope. Get a bigger amp for the bass drivers, smaller ones for mids and highs. You'll notice same thing is done with all manufacturer actives, more power available to the bass. Logical.
You can go the classical path, which most people would find more comfortable with, getting an active crossover + power amps. In that case you can get any power amp to do the job, no need for integrated DSP.
How to attenuate each driver set correctly is easy. You can use a simple mic and record at your listening position. You really have no use for an anechoic chamber, you want to take the room in the equation. Adjust drivers to get inroom flat frequency response. Simple as that. You don't even need to buy this measuring equipment, lpv can help you with this I'm sure.
At this point, if you decide to get these K100s, best would be to get the biggest amp that would later do bass duties and enjoy the speakers as passives for a while, learn their character, interaction with the room, get comfortable, savor the journey. Take some mic measurements. After months or a year if you feel it's a worthwhile investment to go active then you can get two more amps and go full monty, no crossovers. Those WA K100 crossovers reek of quality, so I wouldn't just rush towards active conversion.
Just checked them out briefly quite cheap too.
Do these amps make fan noise do you know?