I emailed HK and they responded immediately that thier update server is down. They were nice enough to include the update file as an attachment. I was very happy with the response time from HK support
I have the 635 hooked up to a 5.1 mirage Avs 200/Rs8 setup, not my main Klipsch gear atm. After rerunning setup it set my sub at -8dB... and considering its in the corner of the room and not a very good sub at that it sounds better cranked down in reference to the center. Ie center is flat, l, r, and sides are slight 1 to 3dB boosts, sub is notched way down.
Its pretty optimum for the small setup that its hooked to. Manually playing with tweaking Xover (distance settings it nailed) and db adjustments I cant get a better response than EZ calculated.
Overall, I'm impressed. Its doing a great job with very substandard speakers.