I also have a 1.5 & I am very happy with what it does. I use it on all my front end gear & my entire home theater including a 65 inch projection T.V. I tried it on my amp & I felt it slowed down the pace of the presentation. I wanted to have surge protection on the amp but not at the expense of the music. This is my opinion others may differ. I think Equi=Tech may have found something similar & responded with the Q version. Good digital gear especially likes balanced power.Prior to installation, the difference in the sound quality between my Krell KAV 300cd & My SonyDVP9000Es was not as huge as the price difference would justify. With balanced power the Krell just blows away the Sony. Larry W.