Harald,

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4. Spirit level ????
Is that a laser based measurement - I have only used a "vater" so far.
Spirit level = bubble level, surveyor's level, water level

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Any other suggestions other then the 5500 - Velodyne ??
If seamless integration into the system's sound is what your after, I'd go for the Velodyne. The DD range offers a myriad of opportunities, you can even find the best place for your main speakers with the set-up programm. They come with a room equalisation system - up to 120Hz - and a very convenient auto set-up mode. You can also store up to 6 different presets, there's a remote control and a late night mode.

As a subwoofer Velodyne's DD series raknks among the very best woofers, what sets them apart IMO is the configuration and equalisation programm.

- m