this is interesting, from the audio check site: http://www.audiocheck.net/audiotests_frequencychecklow.php
As for 14hz I think that is all up to your system ability to push that pressure on your eardrum as I doubt you can actually hear that ha!
I have both the focal spirit pro, and the NAD50 on their way to kick my sony7520 but!
Personally I doubt either could touch the Sony's bass.
After I let them all fight it out, I will be selling them all as I just wanted to own them and have no intention to keep these anymore...
I now have the ultrasone ed8 glued to my head and they did some crazy schiit to my ears as they took possession over my ears..
In case anyone wants to know I do like the sony7520 but mainly in its clear bass and neutral mids.
I don't care for its shiny trebles because the higher esw11 & ed8 does it better but really can't complain these Sony are definitely a cut above most.
More impressions to come later..
My current gear is an odac & schiit vali combo..
Plan to upgrade once I get rid of all these cans!
Edited by Maxx134 - 2/26/14 at 4:50pm