As in the sound quality was improved. Namely bass had more punch and there was an increase in detail. A subtle improvement but still noticeable (not that I did any blind testing or anything like that).
I'm sceptical of the notion that cables can always provide a significant or even subtle increase in sound quality, and I wouldn't spend a lot of money on them. In this case I guess it's less surprising that the Blue Jeans cables did provide an observable improvement simply because my previous interconnects were probably of low quality.