Active Speaker Crossovers
Most Speakers with passive crossovers can be upgraded by converting them to an active system where the preamp feeds active crossover boards which then feed individual amplifier boards for each driver. This makes life easier for the amplifiers which only handle part of the audio spectrum but most of all allows the amplifiers to control the drive units much more accurately.
My Apogee Stage speakers are now active using a Trimodal amp for the ribbon and Hypex amp for panel, crossover 500Hz Linkwitz-Riley 2nd order.
Systems have also been sold for Yamaha NS1000 & NS10 speakers and also Lema Xeta speakers.