I use a Genelec system: 8050s across the front, 8040s for surround, and a 7070A sub.
7070A sub has built in bass management with a fixed 85Hz crossover. There is a remote available to bypass bass redirection and switch the LFE +10dB on and off. The LFE low-pass filter is switchable between 85 and 120Hz. I also have the Waves 360 bundle, so if I needed to monitor with different cross-over points, etc., I can bypass the hardware management and use the Waves plugin.