Claims, however, of D / O presence in most remote locations can not be distinguished from the hypothesis that many regions are just exhibiting temporal variability in climate proxies with approximately similar frequency content. (realclimate.org)
I see three things not to like: First, they are comparing the time wave - forms of two signals with very different frequency content. (judithcurry.com)
The Plus Series performance approaches the Ultra Series and handles the most demanding low frequency content with ease. (svsound.com)