
AcuDefTechGuy
Audioholic Jedi
Well, my teacher (that's avaserfiS-1 Floorstander is 33-32. http://www.mbquart.com/en/produkte/home/alexxa/produkt.php?nr=s-one
I don't know where those other specs came from.
If you look at the Lab data on one of the reviews of the S-one, I think it actually says 51 Hz @ -3 dB on-axis:
http://www.mbquart.com/all/downloads/testberichte/Stereoplay_11_06_AS_Sone_en.pdf
Look at the SPL vs Freq Resp graph and you will see that the +/- 3dB is around the 50 Hz mark:
http://www.mbquart.com/all/downloads/testberichte/HifiTest_6_06_Alexxa_S1_en.pdf