“All of this extended listening allows me to come to the point fairly quickly: if another HiFi manufacturer had not already nabbed the strap line Simply Better then it would be perfectly apt for the EQs; time and again I took them out from under the Pathos and then after a while put them back in again.  Each time the music sounded better with the EQs in the system than when they were not.

“Fair enough” I hear you say “but can you give us some examples?”  I thought you would never ask.  Near the beginning of the title track of Leonard Cohen’s You Want It Darker there is a simple drumbeat overlaid with a bass guitar.  With the EQs in place, there was a percussive thump to the leading edge of the drumbeat that was lessened when the EQs were removed.  Also, with EQs, the drumbeat held its own behind the bass.  Without EQs, it seemed to hide in the bass guitar’s shadow.  This, of course, is just a small detail from a song which features a male choir and a huge, deep close- mic’d vocal from Cohen.  Taken overall, the separation between the instruments (drumbeats and bass), choir, and Cohen’s vocals (quite obviously recorded in a different acoustic space) were more evident and the whole thing just sounded better.”

Read more here: https://www.hifipig.com/stack-audio-auva-eq-equipment-isolators/