Look, I appreciate the comments and understand the viewpoints about how this may be a flawed experiment. However, as I've said, this amp really is not that slow with the JBL's which is a quick sounding speaker and I know that I have heard people (some heree on this thread) and many a cable manufacturer (though I do not take their word as gospel) to attribute gains in prat and tempo from cables. Again, I'm not expecting ss speed nor is that what I am necessarily after- I'm just looking for an incremental improvement. If I want to listen to something with more boogie factor I can listen to my Vincent K-35 with Genlex kt-77, or next in line would be my Dialogue Premium, or my Audio Alchemy DPA1 (ss)- which all provide plenty of, especially the Vincent. It would just be nice to see if I can make a small improvement here with this SEP as it was not a planned or big purchase- there are no high stakes here. If it doesn't work- then I'll still have a cheap amp that plays fantastic with jazz, vocals, and even down to mid-tempo electronic music. I'll also likely have nicer cables from the upgrade that the rest of my gear can benefit from.