I also have the same Denon 2900/Outlaw 950 setup. The Denon bass management and the Outlaw analog bass management give you a single crossover point of 80 Hz. If 80 Hz is good for you across the board, then on DD/DTS 5.1 material you can use whichever output sounds better to you. Experimentation is fun!

Make sure you're using one unit's bass management or the other, not both. For example, set the Denon's filter to "off" and the Outlaw's analog bass management to "on", or, set the Denon's filter to "on" and setup you speaker sizes in the denon and switch the Outlaw's analog bass management to "off".

I'm very happy with the combo although it took a little while to get it setup right. Enjoy!