Where to put best interconnects

I use Audience AU24 SE on my sources to my preamp. I use Benchmark XLR's (25-feet and 15-feet for 2 systems) between my preamp and amp.

The preamp to amp connection did not benefit with the same Audience AU24 SE XLR when I tested it out by moving the preamp near the amp for testing.

Best interconnects on amplifier. Best power cord on amplifier. Then work your way up the chain.

Will place the better cables at source, according to Lalitk.  Have SR Atmosphere Eurphoria SX as the newer, and Transparent Reference from 2003 as older, which are ok, but not as revealing.  

I’ve found that both the cable between my dac to preamp and preamp to amp make a difference. I’m using the same cable type for both. I couldn’t say which one is more important.

@Lalitk

+1