[Wayne A. Pflughaupt]

Thomas,

@Wayne,
i've already tried some sort of Houscurve rising the power of about 5dB from 100 Hz downto 20 Hertz, but I don't like the sound resulting from that. Theres to much deep bass energy going into the room, making the Sound muddy and unclear.
I prefer a bass more clear with lots of kick but less subass.
I Think my room ist too small for extrem subbass power.

Yup, if you do a curve all the way down to 20 Hz that’s what you’ll get – too much deep bass energy. Try sloping your curve between 100 Hz and about 30-32 Hz, and then shelve it (keep it flat) below that point. I think you’ll like the way that sounds a lot better. After you dial in the curve, re-adjust the sub’s level to the mains.

Here’s the relevant section from the house curve article:

Why shelve response?

Earlier I mentioned shelving your house curve. I personally prefer to shelve response at 30-32 Hz rather than allowing the curve to continue rising. What that means is the rise stops at that point, and is flat from there down to the sub’s lowest limit. I initially kept the slope rising all the way to the bottom, but I found there was an overabundance of ultra-low energy. The bass in music sounded "heavy," and with movies things like car doors slamming had all the "umph" of a distant explosion. Certainly did not sound natural. Shelving response at 32 Hz solved that problem. Since every room and system is different, it doesn’t hurt to experiment, but if you find a continually rising curve sounds bad, try shelving it. Music should be greatly improved, as I’ve found that bass detail gets obscured if response continues to rise. There’s no penalty with movies, since they have greatly exaggerated extension that essentially overrides any shelving.

Also, the 5 dB slope you did might not be enough. With small rooms, you usually need a steeper slope than large rooms need.

The house curve article also gives tips on how to dial one in.

Regards,
Wayne