Yes, my measurements are consistent and repeatable. Just ran it again with same results.

I have the mic pointing straigt up on a tripod in my normal listening position. Height like the tweeters. 

Speakers are in option 0, Beovision 7 volume at 52, Overture audio source on cd, thus the Beolab 5s are prefering the spdif signal from the minimac.

The only factor I change is turning one of the mains around. The overall magnitude is very different. In the other scenario the baseline is approx. -15db, so it is a much weaker signal.

I have the FuzzMeasures on another computer, If I can edit this post from the other machine i'll insert the other scenario into this post shortly. 

EDIT: image inserted ( two measurements with same setup overlay)

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Hmm, a sudden drop-off below 400 Hz? This would suggest something to do with the calibration system, which I believe functions up-to around 400 Hz. Very strange!

The difference in the measurements between the polarity-flipped mains is quite interesting. Not that I don't trust you, but is there any possibility you could do maybe 3 or 4 measurements of normal, then immediately flipped, and post each graph up here?

I really don't see how this could make any difference...

I have an in home demo of the 5s scheduled later this month. I am very curious how they will sound.

Did alot of testing today, flipping mains. Conclusion is clear: No effect at all.

I have measured hundreds of sweeps in option 0 and 4 each with the four possible combinations of plugs directions. I was fooled a couple of times to believe I got a different result, but in the end of the day I was able to dismiss the odd measurements. So my measurements are very consistent, like the last graph posted.

So in the present setup it seems I have some really nasty dips ( or "nulls" I think is the right term) below 400hz. I'm really not an expert, but I'll experiment with speaker placement tomorrow. Hopefully I can improve on the measurements with alternative speaker positions.

That's better!🙂

The nulls are position dependant in the room and are set by room dimensions and surfaces. If you are going to be measuring while moving speaker position then the mic should be located at your intended listening position (as should you, ideally).

Don't expect a flat bass response throughout your room, the best you can achieve is to minimise frequency related amplitude variations at your listening point of choice.

Had the 5s in my home today. I will be staying with my current 9s. The 5s sound different, but I like the 9s just as well, or perhaps better. Dealer also brought a Beolab 2 to try with my Beolab 1s. That made a huge difference and I will be considering one of those.

Razlaw wrote:

Dealer also brought a Beolab 2 to try with my Beolab 1s. That made a huge difference and I will be considering one of those.

That doesn't surprise me at all. I find Beolab 1's remarkably bass light given thier size - Penta's (which BL1's were supposed to directly replace) outperform them easily in that area IMO.

Chris.