ATC does build passive because some folks just want a passive. We know this is the reality of the market. But we spend a lot of time talking about active because its genuinely a step forward (and it costs the customer less for higher performance). ATC active beats ATC passive on multiple technical fronts.
We have done demos at shows with the same speaker both active and passive right next to each other on the same source, using ATC amps (which have the same circuit design and output devices to the active system) and its a clear advantage to go active. The image and clarity and resolution of details is dramatically different. The "tone", meaning the spectral info, the sound character of the piano if you will, is the same. SO active versions of speakers have better imaging, greater resolution of the finer details of the music than passive versions of the same speaker even with identical power behind them.