I had active Buchardt A500SE monitors which used two 6.5 inch Purifi mid/woofers (one forward firing and one rearward firing) with a 0.75 inch tweeter in a wave guide. Inside were four 150 watt amps (the front Purifi was wired as a midrange and a woofer). It connected wirelessly or via XLR. It had "master tuning" options and in wireless mode also had room EQ. It was rated in-room down to 25 Hz. A wonderful all around speaker. The A500SE has been replaced with the A10, which deletes the rear driver but is less expensive.
Active designs (used by studio professionals) have a number of inherent acoustic advantages over passive (typical consumer) designs. The crossover is low voltage (before the amps) so it can be more precisely designed and a DAC/room EQ can be incorporated. The designer picks the amp and matches it to the driver. The amp "sees" the driver load so is more reactive to the driver. Bass typically goes lower and dynamics are improved.
