In my system it replaced a Galileo SX power cable from wall to PowerCell. So the SRX was competing against an already first rate power cord which already had a treated grounding cable. The SRX is quite amazing. Prior to the (completely reversible) makeover, the SRX opened up the top end in a major way. The top end wasn’t just more extended, it was more detailed and I started noticing percussion that just wasn’t audible before the SRX. Records with depth showed more of it, and the bass also felt much more extended. In the midrange, there was less grain. It was a very exciting improvement, noticeable from the first few seconds of the first record. As noted in the above post, this went from exciting to mindblowing when the grounding cable was treated.